XTM Racing XST 4WD Truggy RTR User manual

Page 1
OPERATING INSTRUCTIONS AND ASSEMBLY MANUAL
Before operating your new XTM Racing XST 4WD Truggy RTR,
please read and understand the warnings listed on the next page.
Failure to do so could lead to injury and/or property damage.
The XTM Racing XST 4WD Truggy RTR is not intended for persons
under 14 years of age, unless closely supervised by an adult.
Made in Taiwan
*Due to production changes, the
photos in these Operating
Instructions may differ from the
actual production model.
Kit Product # 145635 (US) / C-XTM-XST (Europe)
XST 4WD TRUGGY RTR FEATURES
lFactory-Built
lPowerful XTM Racing 24.7 Engine with Pull-Starter
lAluminium Header and Tuned Pipe
lFull Set of Sealed Ball Bearings for Drive Line
lFactory-Printed Body Shell
lHigh-Torque, Metal-Geared Steering Servo
lLay-Down Steering Servo for Lower Centre of Gravity
lAluminium Threaded Shocks w/3.5mm Shock Shafts
lBevel Differentials - Front, Rear and Centre
lHeavy-Duty Aluminium Front and Rear Chassis Bracing
lDust-Resistant Receiver and Battery Boxes
lAdjustable Toe-in, Front and Rear
lAdjustable Camber
l3mm Aluminium Chassis w/Kicked Up Front End
l4mm Aluminium Shock Towers
lChrome-Plated CVDs and Drive Shafts for Greater Strength
lGearboxes Allow Easy Differential Removal
lBi-Level Wing for Added Rear Downforce
lOff-Road 'Trackers' Tyres for Maximum Traction
lDish-Style Racing Wheels (Will Accept a Wide Range of
After-Market Tyres)
SPECIFICATIONS
l
Length.....................................................................533mm/21"
l
Width (Front/Rear) ............................419~425mm/16.5~16.75"
l
Height.....................................................................165mm/6.5"
l
Wheelbase (Adjustable).......................349~355mm/13.75~14"
l
Weight..................................................................4.13kg/9.1lbs
All contents copyright © 2008, XTM Racing - All Rights Reserved
Version 1 July 2008
Includes Cirrus 3 Channel FM Radio and XTM Racing 24.7 Engine!

Page 2
lNever use any fuel in your engine other than glow fuels
specically designed for use in model car engines. Use of any
other types of fuel can cause severe damage to your engine
and/or personal injury.
NEVER USE GASOLINE/PETROL OR DIESEL FUEL!
lNever operate your model on any public streets. This could
cause trafc accidents, personal injury and/or property damage.
lGlow fuel engines emit exhaust vapors that are poisonous
and can be dangerous to your health. It is important that you
operate your engine in a very well-ventilated area, preferably
outdoors.
lBefore starting your engine, make sure that the throttle trim
is set to the idle position. Starting your engine at any setting
above idle can cause the model to lurch out of your hands.
lWhen your engine is running, there are certain parts that rotate
at high speeds. Be careful not to touch the drive shafts, gears,
clutch assembly or any other moving parts. Otherwise, serious
injury could result.
lIt is normal for your engine and tuned pipe to get very hot during
operation. Never touch these parts while they are hot or you
could be burned.
lModel engines produce vibration when they are running. It is
important to periodically check the engine mounting screws
and other assemblies to ensure they are tight. Running your
engine with the engine mounting screws loose can lead to
severe engine and/or chassis damage.
lUnder no circumstances should you operate your model in
crowds of people. Serious injury could result.
lNever operate your model on busy streets or if there are cars
around.
lDo not use your model to chase pets or other animals.
lThe receiver and battery boxes are not waterproof; therefore,
do not drive through water, wet grass, mud or snow.
lBecause your model is operated by radio control, it is important
to make sure you are always using fresh and/or fully charged
batteries (if using NiCDs or NiMHs). Never allow the batteries
to run low or you could lose control of the model.
lIf your model becomes stuck, allow the engine to idle, then
retrieve your model by hand.
lTo prevent excessive r.p.m.s from damaging your engine and/or
drivetrain components, we suggest reducing throttle while in
the air during jumps.
SAFETY WARNINGS
ENGINE WARNINGS GLOW FUEL WARNINGS
lGlow fuels like those used in your model engine are extremely
poisonous. Follow all the precautions that are printed on the
fuel manufacturer's container.
lKeep glow fuel out of the reach of children.
l Glow fuel is extremely ammable. Keep away from high heat,
sparks and ame.
GENERAL WARNINGS
TABLE OF CONTENTS
Visit us on the web at
www.teaMXtM.CoM
DISTRIBUTED IN EUROPE BY:
Ripmax Ltd.
241 Green Street
Eneld, EN3 7SJ, U.K.
DISTRIBUTED IN NORTH AMERICA BY:
Global Hobby Distributors
18480 Bandilier Circle
Fountain Valley, CA 92708
Safety Warnings ........................................................................................2
Customer Service Information...................................................................3
Introduction................................................................................................3
Popular Option Parts .................................................................................3
Recommended Tools and Supplies ...................................................... 4~5
Becoming Familiar with Your XST 4WD Truggy RTR .......................... 5~6
Tips From the Pros ....................................................................................7
Preparing to Run Your XST 4WD Truggy RTR ...................................7~11
Becoming Familiar with the XTM Racing 24.7 Nitro Engine..............11~13
Fueling and Starting the XTM Racing 24.7 Nitro Engine.........................13
Breaking in and Fine-Tuning the XTM Racing 24.7 Nitro Engine..... 14~16
Basic Engine Maintenance......................................................................17
Installing the Body Shell ..........................................................................17
Chassis Tuning Guide ...................................................................... 17~22
Maintaining Your XST 4WD Truggy RTR.................................................23
Troubleshooting Guide ..................................................................... 24~25
Assembly Manual ............................................................................ 25~52
Replacement Parts List .................................................................... 53~58
Option Parts List .............................................................................. 59~63
Important Warranty Service Information...................................Back Cover
Warranty Information ................................................................Back Cover

Page 3
The XST 4WD Truggy RTR is a purpose-built truck meant to handle the different
terrain it encounters. With 4mm thick aluminium shock towers, threaded aluminium
oil-lled shocks with 3.5mm diameter shock shafts, chrome-plated front universals
and 3mm thick aluminium chassis, you'll be sure the XST 4WD Truggy RTR is
ready for back yard bashing or the next trip to the local track. The XTM Racing
24.7 engine with aluminium tuned pipe is the heart of the XST 4WD Truggy RTR
and this power plant has been a reliable source of fun in numerous XTM Racing
cars and trucks for many years!
For those who do choose to race the XST 4WD Truggy RTR, they can be assured that it will perform with beefy 5mm aluminium braces
that support the front and rear gearboxes, a mega high-torque metal-geared steering servo, and steel drive train to keep the enjoyment
owing. A race-legal 150cc fuel tank is also tted for fewer pit stops. Additionally, with its stock wheelbase and steering geometry, the XST
4WD Truggy RTR will make it through the tightest turns on the track. Take the inside line! From the adjustable camber and toe-in on the
front to the adjustable caster on the rear, the XST 4WD Truggy RTR can be adapted to any condition and driving style that it meets.
This Operating Instructions and Assembly Manual is designed to help you get your new XST 4WD Truggy RTR running
as quickly as possible. Included is information on taking your X
included are Pro Tips, a Chassis Tuning Guide and a complete Parts/Option Parts List with detailed Exploded View Assembly
Drawings. 
If you should have trouble with any of the steps listed in these Operating Instructions, or if you nd a missing or damaged part
in your kit or require additional information, please contact your local distributor at the address below:
XTM Racing guarantees this kit to be free from defects in both material and workmanship, at the date of purchase. This does not cover any component
parts damaged by use, misuse or modication. In no case shall XTM Racing's liability exceed the original cost of the purchased kit.
In that XTM Racing has no control over the nal assembly or material used for nal assembly, no liability shall be assumed for any damage resulting from
the use by the user of the nal user-assembled product. By the act of using the nal user-assembled product, the user accepts all resulting liability.
In North America:
Global Services
18480 Bandilier Circle
Fountain Valley, CA 92708
Phone: [phone]
Fax: [phone]
Email: [e-mail]
In Europe:
Ripmax Ltd.
241 Green Street

Phone: [phone]
Fax: [phone]
Email: [email protected]
CUSTOMER SERVICE INFORMATION
POPULAR OPTION PARTS
XTM Racing produces a number of popular option parts for your XST 4WD Truggy RTR. Please see page 59 for a complete list of
current option parts. New option parts are always in the works, so check our website often at www.teamxtm.com.
Sure Start Electric Starter
INTRODUCTION
7075 Steering Knuckles and Hub Carriers 2-Speed Conversion Kit
7075 Front and Rear Lower Suspension Arms 7075 Front Upper Suspension Arms 7075 Suspension Plate and Holders

Page 4
RECOMMENDED TOOLS AND SUPPLIES
This section lists the recommended tools and supplies that you need to purchase and have onhand to nish assembling and to run and
maintain your new XST 4WD Truggy RTR.
DO I NEED TO PURCHASE EXTRA GLOW PLUGS?
Yes. Even though your XTM Racing 24.7 engine comes with a glow plug already installed, glow plugs
wear out, especially during the break-in period; therefore, it's a good idea to have a couple of spares
handy. We recommend using a 'medium' or 'hot' heat-range glow plug intended specically for
performance engines like the XTM Racing # 4 or the XTM Racing # 3 during the break-in process.
After the break-in process you may want to use a different heat-range glow plug. Do not use glow plugs
intended for four stroke airplane engines or glow plugs with an 'idle bar'. Using the wrong type of glow
plug will cause the engine to run erratically and make it difcult to tune properly. The wrong type of glow plug could also damage the
engine. AN XTM RACING # 4 GLOW PLUG IS INCLUDED IN THE ENGINE.
20% Nitro Car Fuel
Use For Break-In and For
Normal Use
20% Nitro Car Fuel
(use this fuel for break-in and normal use)
30% Nitro Car Fuel
(use this fuel after break-in for more power)
WHAT FUEL DO I USE?
Fuel can make a big difference in the way your engine performs. For the break-in period you should use a fuel specically designed
for R/C car engines that contains no more than 20% nitromethane and 10% ~ 14% oil content. Once the engine has been adequately
broken in (about 45 minutes of run-time) you can switch to an R/C car fuel containing up to, but no more than, 30% nitromethane
and 10% ~ 14% oil content.
WARNING: We do not recommend using fuels designed for R/C airplane engine use. These fuels do not contain the proper amount
of lubricants; therefore, they will cause the engine to overheat and severe damage to the engine will result.
DO I NEED TO USE A FUEL BOTTLE?
Yes. Because fuel is packaged in quarts, gallons or litres, you will need to use a smaller
bottle with an extension tube to ll the fuel tank. Fueling using this method is much
easier, faster and a lot less messy.
Fuel Bottle
Use This to Fill the Fuel Tank
HOW DO I REMOVE THE GLOW PLUG?
A long reach glow plug wrench is necessary to easily and quickly remove and replace
glow plugs.
1/8th Scale 4-Way
Wrench
Use This to Remove
and Reinstall the
Engine’s Glow Plug
WHAT DO I USE TO IGNITE THE GLOW PLUG?
Glow Starter
Use This to Ignite the
Engine’s Glow Plug
A glow starter is a battery-operated device that, when attached to the glow plug, heats
the glow plug so that the engine can start. The glow starter is then removed once the
engine is running.

Page 5
l8-Pack 'AA' Alkaline Batteries for Transmitter
l4-Pack 'AA' Alkaline Batteries for Receiver
lHigh-Quality After-Run Oil
lXTM Racing Air Filter Oil
lNitro Car Cleaner
lMetric Ruler
lSmall, Flat Blade Screwdriver and #1 and # 2 Phillips Head Screwdrivers
l1.5mm, 2mm, 2.5mm and 3mm Hex Wrenches
l 5.5mm and 7mm Nut Drivers
lAdjustable Wrench and Needle Nose Pliers
lAssorted Weights of Silicone Oil to Tune the Shocks and Differentials (Optional)
RECOMMENDED TOOLS AND SUPPLIES, CONTINUED....
BECOMING FAMILIAR WITH YOUR XST 4WD TRUGGY RTR
In addition to the items listed previously, the following tools and supplies will also be required to run and maintain your XST 4WD Truggy RTR:
Each radio control system comes with a sticker on the transmitter and on the receiver showing which frequency the radio control system
operates on (either in the 27MHz, 40MHz or 75MHz band). No two radio systems can operate nearby each other if they are on
the same frequency. You can purchase transmitter and receiver crystals separately and change them if you plan on running your XST
4WD Truggy RTR with other people.
27MHz and 75MHz
These frequencies are legal for use in North America
27MHz and 40MHz
These frequencies are legal for use in Europe,
but can vary from country to country
Antenna: Transmits the signal from the transmitter to the receiver. The antenna should be completely extended during use.
For onboard charging when using rechargeable batteries (not supplied).
Battery Cover: This cover houses the 8 'AA' Alkaline batteries (not supplied) that power the transmitter.
Channel 3 Button: Used to operate a third function, like switching to reverse function on a model that features reverse. The channel
3 button is not utilised with the XST 4WD Truggy RTR.
Crystal: This is the frequency crystal of the transmitter. You can change crystals in both the transmitter and the receiver so that you
and your friends can drive at the same time. No two radio control systems nearby can be operated on the same frequency.
Digital Function Buttons: Used to adjust steering and throttle trim, function changes, EPA, dual rates and servo reversing.
LCD Display: Displays all menu screens for function updates, power level indicator, etc.
ON/OFF Switch: Turns the transmitter on and off. A red L.E.D. indicates that the transmitter is turned on. Voltage is displayed on the
LCD display.
Steering Wheel: Controls your XST 4WD Truggy RTR’s steering. Turn the wheel to the right and the XST 4WD Truggy RTR turns
right. Turn the wheel to the left and the XST 4WD Truggy RTR turns left.
Throttle/Brake Trigger: Controls the speed and braking ability of your XST 4WD Truggy RTR. Pull the trigger to accelerate, release
the trigger to decelerate, and push the trigger to brake.
For more information on the features and use
of your Cirrus 3CFM transmitter, please refer
to the separate User's Guide provided.
Note: The Cirrus 3CFM radio is not available on 75MHz.
Antenna
ON/OFF
Switch
Auxiliary
Charge Jack
Channel 3
Button Battery Cover
Steering Wheel
Digital Function
Buttons
Digital Function
Buttons
LCD
Display
Crystal
Throttle/Brake
Trigger

Page 6
BECOMING FAMILIAR WITH YOUR XST 4WD TRUGGY RTR, CONTINUED....
Air Filter: The air lter is made of foam and prevents dirt and debris from entering the engine through the carburettor. The air lter should
be 'wet' with air lter oil for maximum efciency.
Antenna: Receives the signal from the transmitter. The antenna should be completely extended. Do not cut the antenna shorter.
Battery Box: The battery box protects the receiver batteries from dust, dirt and oil. The battery box is not waterproof.
Body Mount: Made of high-impact nylon plastic for strength, the body mount supports the body.
Engine: The XST 4WD Truggy RTR includes the powerful XTM Racing 24.7 engine with pull-starter for ease of use and great performance.
Bumper: Made out of high-impact nylon plastic, the bumper protects the chassis from most head-on impacts.
Fuel Tank: The fuel tank holds the fuel that your engine uses. The fuel tank includes a fuel pressure nipple that connects to the tuned pipe
to pressurise the fuel system and also features a quick-ip type lid for fast refueling. A splash guard and overow drain are also featured.
ON/OFF Switch: Turns the receiver on and off.
Pull-Start: Spring recoil system used to start the engine.
Receiver Box: The receiver box protects the receiver from dust, dirt and oil. The receiver box is not waterproof.
Shock Absorber: Each shock is oil-lled and uses a spring that is well suited for most off-road conditions. The shocks feature threaded
shock bodies that allow the shocks to be easily tuned for different driving conditions. The shocks come standard with # 400 (40 weight)
oil and 1.6mm yellow springs.
Shock Tower: Secures the shock absorber while allowing many different geometry settings to suit different track conditions.
Steering Servo: Controls the XST 4WD Truggy RTR's steering. A 'servo saver' is used to help prevent the servo gears from being
stripped out. The XST 4WD Truggy RTR features a high-torque metal-geared servo for maximum steering power.
Steering Tie-Rod: The tie-rod connects the steering linkage and the steering knuckles. The tie-rods are adjustable so you can
make toe-angle adjustments to the front wheels.
Suspension Arm: Helps improve the XST 4WD Truggy RTR's handling (when coupled to shock absorbers) and braking while ensuring
maximum traction (keeps the wheels in contact with the ground) and protects the chassis components from undue stress and strain.
Throttle/Brake Servo: Controls both the XST 4WD Truggy RTR’s acceleration and braking functions.
Tuned Pipe: The tuned pipe is an expansion mufer that greatly increases the power output of the engine.
Wheel/Tyre Assembly: The XST 4WD Truggy RTR features moulded rubber tyres with a tread pattern that is good for most off-road
applications. The wheels are moulded in one piece from lightweight, high-impact plastic for strength.
Wing: Provides downforce to ensure maximum traction when racing. Wing angle can be adjusted to suit different track conditions.
PHOTO SHOWN MAY DIFFER
FROM ACTUAL PRODUCTION MODEL
ON/OFF
Switch
Shock Absorber
Wheel/Tyre
Assembly
Shock Tower
Wing
Battery Box
Air Filter
Throttle/Brake Servo
Receiver Box
Steering Servo
Body Mount
Bumper
Suspension Arm
Steering
Tie-Rod
Fuel Tank
Tuned Pipe
Pull-Start
Engine
Antenna

Page 7
TIPS FROM THE PROS
YOUR XST 4WD TRUGGY RTR SHOULD INCLUDE THE FOLLOWING ITEMS SEPARATELY IN THE BOX:
lTyres and Wheels (Glued)
lBody Clips
lDecal Set
lPlastic Parts Set
lReceiver Antenna Support Tube
lSuspension Plate Holders
l Air lter Assembly
lAllen Keys and Wrenches
PREPARING TO RUN YOUR XST 4WD TRUGGY RTR
Now that you are familiar with the major component parts of your XST 4WD Truggy RTR, and with the functions of the Cirrus 3CFM
transmitter, it's time to prepare your XST 4WD Truggy RTR for its rst run.
IMPORTANT: Before continuing, please double-check that you've read and understood the warnings on page 2. It's important that
you understand this information before preparing to run your XST 4WD Truggy RTR. Also, remember, if you have any questions or
encounter any problems, you can contact your local distributor using the Customer Service Information on page 3.
lXST 4WD Truggy RTR Chassis
lCirrus 3CFM 3 Channel FM Transmitter
lTransmitter Antenna
lLexan Body Shell (Printed) and Nylon Wing
STEP 1: FINAL ASSEMBLY
l
Make sure to read these Operating Instructions and Assembly Manual in its entirety before starting. This will allow you to become
familiar with the XTM Racing XST 4WD Truggy RTR, XTM Racing 24.7 Nitro Engine and Cirrus 3CFM radio control system.
l
Double-check all of the fasteners to ensure that they're tight.
lAny screws that are threaded directly into metal should be secured into place with threadlock. This will prevent the screws from loosening
during use. Screws threaded into nylon or composite material do not require threadlock.
lDo not overtighten any screws that thread into nylon or composite material, or the material may strip out. Screws threaded into nylon
or composite material need only be tightened snugly.
l After installing the receiver batteries into the battery holder, t a rubber band or a nylon cable tie around the battery holder. This will
prevent the batteries from coming loose when doing jumps, etc.
l
If you have difculty sliding the receiver antenna wire through the antenna support tube, rst pull the antenna wire through your ngers
several times to straighten it, then lightly wet the antenna wire with glass cleaner. The glass cleaner will make the antenna wire slide
through the support tube much easier.
l
When testing the steering, lift the front of the XST 4WD Truggy RTR off the ground. This will allow the steering system to operate
smoothly, without any binding.
l
If the carburettor barrel does not open completely when you pull the throttle trigger, adjust the throttle trim on the transmitter until the
carburettor barrel opens completely when you pull back fully on the throttle trigger.
l
When oiling the air lter element, place the cleaned air lter element in a plastic bag and then apply the air lter oil on it. Close the bag
and work the oil into the air lter element. This allows you to work the oil into the element without getting excess oil on your hands.
l
When you pinch the fuel line to stop the engine, you must pinch it hard and hold it. The engine will rev up quickly, then stop. We
suggest holding the XST 4WD Truggy RTR while doing this, so that it doesn't lurch out of your hands.
l
Other than during the break-in period, always make sure that you install the body when driving your XST 4WD Truggy RTR. When
your XST 4WD Truggy RTR ips over, the body will help protect the chassis and its components.
l
Place the chassis on a dedicated car stand or similar so that all four wheels are suspended off the ground. This ensures that your
XST 4WD Truggy RTR does not accidentally drive away when starting the engine if the idle setting is too high.
qInstall the wheels onto the chassis, making sure to tighten the wheel retaining nuts
rmly, using a 17mm wrench.
+Notice that the back of the wheels are moulded to key over the hex-shaped wheel
hubs. All four wheels and tyres are the same size.
IMPORTANT: Double-check that the tyres are glued onto the wheels. If they're not,
glue the tyres onto the wheels, using C/A tyre glue. See page 51 for information on
how to glue the tyres onto the wheels.

Page 8
qPush the transmitter antenna down into the moulded hole in the top of the transmitter.
qThread the antenna (clockwise) into place and tighten it gently until it stops.
IMPORTANT: Do not force the antenna into place or tighten it too strongly. Doing
so could cause damage to the antenna and/or transmitter.
qCheck to make sure that the transmitter ON/OFF switch is in the 'OFF' position.
qRemove the plastic battery cover from the bottom of the transmitter.
qInstall 8 'AA' Alkaline batteries into the battery tray, double-checking to make sure
that the polarity (+/-) is correct.
qReinstall the battery cover and set the transmitter aside for now.
qCheck to make sure that the receiver ON/OFF switch is in the 'OFF' position. 'ON'
and 'OFF' are moulded into the switch cover plate.
qOpen the battery box cover by removing the retaining clip and pulling up on the front
of the battery box cover. The battery box cover is hinged at the back.
qRemove the battery holder from the battery box.
PRO TIP: After installing the batteries into the battery holder in the next procedure, we recommend tting a rubber band or a nylon
cable tie around the battery holder. This will prevent the batteries from coming loose when doing jumps, etc.
qInstall 4 'AA' Alkaline batteries into the battery holder, double-checking to make sure
that the polarity (+/-) is correct.
qReinstall the battery holder into the battery box and secure the battery box cover
back into place, using the retaining clip.
IMPORTANT: Make sure that the batteries are pushed rmly into place. They should not be loose. If for any reason the plug from
the battery holder (male plug) is not plugged into the switch (female plug), plug them together now, making sure that the polarity
is correct. For safety, the plugs can t together only one way.
Upgrading your transmitter and receiver to use rechargeable NiCD or NiMH batteries is
easy and recommended. You will need to purchase 8 'AA' rechargeable NiCD or NiMH
batteries for the transmitter, a 5 cell 1200mAH (or higher capacity) NiMH battery pack
for the receiver, and a compatible transmitter/receiver (Tx/Rx) charger.
For UK/Europe:
We recommend the Ripmax P-FBC10D/4 (UK) / P-FBC10D/4EUR (Europe), Tx/Rx
NiCad/NiMH AC Charger 70/70mA.
For North America:
We recommend the Airtronics 95033Z 110V AC 75mA Dual Charger.
UPGRADE TIP
Charger for UK/Europe
Charger for
North America
5-Cell NiMH Receiver Pack
Transmitter
NiCDs/NiMHs

Page 9
qSlide the receiver antenna wire into one end of the antenna support tube and out
the other end.
q Push the end of the antenna support tube rmly into the antenna mount (you may
have to loosen the nut), then gently tighten the nut to lock the antenna support tube
in place.
IMPORTANT: Leave the excess antenna wire hanging from the top of the antenna
support tube. Under no circumstances should you cut the antenna wire shorter.
PRO TIP: If you have difculty sliding the antenna wire through the antenna support tube in the next procedure, rst pull the antenna
wire through your ngers several times to straighten it, then lightly wet the antenna wire with glass cleaner. The glass cleaner will
make the antenna wire slide through the support tube much easier.
qRemove the four screws from the receiver mounting box cover, then remove the
receiver mounting box cover itself.
qUncoil the receiver antenna wire and feed it out through the hole in the aluminium
antenna mount, then reinstall the receiver mounting box cover, making sure not to
pinch any of the servo wires.
IMPORTANT: Verify that the steering and throttle servo leads are plugged into
channel 1 and channel 2, respectively.
IMPORTANT: If the red LED does not glow or if it blinks, check the batteries in the
transmitter and replace them or recharge them (if using rechargeable NiCD or NiMH
batteries). It's important that the batteries you are using (Alkaline or rechargeable)
have sufcient power to operate the transmitter. Never attempt to recharge Alkaline
batteries. Doing so could cause them to explode!
qSlide the transmitter's ON/OFF switch forward to turn the transmitter on. The red
LED should glow brightly and the LCD screen display transmitter information.
Before driving your XST 4WD Truggy RTR, always turn on the transmitter rst, followed by the receiver. After you're done driving your
XST 4WD Truggy RTR, turn off the receiver rst, then turn off the transmitter. This will prevent the possibility of a runaway model.
SAFETY TIP
qSlide the receiver's ON/OFF switch to the 'ON' position to turn the receiver on. You
should hear the servos move to their neutral positions.
STEP 2: RANGE CHECKING THE RADIO CONTROL SYSTEM
To ensure that the radio control system is operating properly and to prevent any chance of a runaway model, the radio control system should
be range checked before the rst run of the day and/or after a crash. To range check the radio control system, do the following:
qWith the transmitter and receiver turned on, extend the transmitter antenna completely. With the XST 4WD Truggy RTR on the ground
(without the engine running), walk away from it about 25 metres (75 feet). Move the steering wheel while looking at the XST 4WD
Truggy RTR's front wheels. The wheels should pivot back and forth smoothly without any 'glitching' or interference.
IMPORTANT: If the radio system does not operate properly, please refer to the troubleshooting guide on page 24 before continuing
further. Never attempt to operate your XST 4WD Truggy RTR if the radio control system is not functioning properly.

Page 10
STEP 3: CHECKING THE STEERING AND THROTTLE/BRAKE CONTROLS
qWith both the transmitter and the receiver turned on, rotate the
transmitter's wheel forward (to the right). The XST 4WD Truggy RTR's
front wheels should turn right.
IMPORTANT: If the wheels don't turn right, use the transmitter's
servo reversing function to change the direction that the front wheels
turn. Refer to the transmitter's User Guide for more information.
PRO TIP: We suggest doing the steering tests with the XST 4WD Truggy RTR's front wheels lifted off the ground. This will allow the
steering system to operate smoothly, without any binding.
qRotate the transmitter's wheel backward (to the left). The XST 4WD
Truggy RTR's front wheels should turn left.
qNow, let go of the transmitter wheel. The XST 4WD Truggy RTR's
wheels should return to centre.
IMPORTANT: If the wheels do not point straight ahead (centre) after
you return the transmitter wheel to centre, use the transmitter's trim
function to adjust the wheels so that they point straight ahead. Refer
to the transmitter's User Guide for more information.
qPull back on the throttle trigger. The carburettor barrel should open
completely and the brakes should be disengaged (i.e., the XST 4WD
Truggy RTR should roll forward smoothly when pushed).
qLet go of the throttle trigger and the carburettor barrel should return to
its idle position - open about 1mm / 1/16". The brakes should still be
disengaged, too. If the brakes are not disengaged when the throttle is
at the idle position, see page 19 "Adjusting the Brake Linkage".
IMPORTANT: If the carburettor barrel does not open when you
pull back on the throttle trigger, use the transmitter's servo reversing
function to change the direction. Refer to the transmitter's User Guide
for more information.
PRO TIP: If the carburettor barrel does not open completely, use the transmitter's trim function to adjust the throttle until the carburettor
barrel opens completely when you pull back fully on the throttle trigger. Refer to the transmitter's User Guide for more information.
qPush the throttle trigger forward. The carburettor barrel should stay
in the idle position (open about 1mm / 1/16") and the brake linkage
should move forward and engage the brakes (i.e., the XST 4WD Truggy
RTR will not be able to roll at all when pushed).
qLet go of the throttle trigger and the brakes should disengage.
IMPORTANT: If you need to adjust the brake linkage, see page 19
"Adjusting the Brake Linkage".

Page 11
UPGRADE TIP
To prevent your XST 4WD Truggy RTR from going out of control should the radio control system
encounter signal loss, we strongly suggest using an electronic failsafe. The electronic failsafe is
connected between the throttle/brake servo and the receiver. The failsafe is designed to elec-
tronically bring the throttle to idle and apply a preset amount of braking force should the radio
control system lose its signal. This will prevent the XST 4WD Truggy RTR from driving out of control and causing damage/injury.
A failsafe will not will not work if the radio control system loses its signal due to battery failure (i.e., loss of battery capacity
or the battery coming unplugged) or throttle servo failure.
WARNING!! PLEASE READ THIS INFORMATION BEFORE PROCEEDING!!
BECOMING FAMILIAR WITH THE XTM RACING 24.7 NITRO ENGINE
Your XST 4WD Truggy RTR comes equipped with the user-friendly and powerful XTM Racing 24.7 nitro engine. Before starting the
engine for the rst time, you MUST read this section and the next two sections very carefully. This section details the different parts
of the engine's carburettor and how to adjust the carburettor's needle valves to tune the engine. The remaining two sections detail
fueling and starting the engine, then breaking in the engine. Failure to read this information may result in your not knowing how
to properly operate your new engine, which can result in poor engine performance and even damage to the engine itself.
STEP 4: INSTALLING THE AIR FILTER
q Remove the foam air lter element from the plastic bag and push it onto the air lter
base. Secure the top of the air lter in place, using the screw provided.
IMPORTANT: The foam air lter element comes pre-oiled with air lter oil. See the
information below on how to clean and reoil the foam air lter element when it
gets dirty.
l To clean the air lter, remove the air lter
element and wash it thoroughly in warm water
and a small amount of liquid detergent. After
it's clean, allow it to dry, then reoil it and install
it back onto the air lter housing. To wet the
air lter element, simply squeeze an ample
amount of air lter oil onto the air lter element
and work it through the air lter element, using
your ngers. Use enough oil to completely
saturate the air lter element. The entire air lter element should be oiled, but not so much that excess oil is dripping from it.


the engine will be quickly damaged and require replacement of the piston and sleeve (liner).
If you'll be running your XST 4WD Truggy RTR in dusty
or wet conditions, we suggest using a prelter sleeve
over the air lter. Wet the main air lter element, then
simply slide the prelter sleeve over the air lter. It's
not necessary, nor desirable, to oil the prelter sleeve.
We suggest using XTM Racing 1/8th Scale Prelter
Sleeves (P/N 149412).
UPGRADE TIP
PRO TIP: Place the cleaned air lter element in a plastic bag and then apply the air lter oil on it. Close the plastic bag and work the
oil into the air lter element. This allows you to work the oil into the element without getting excess oil on your hands.
qSlip the short end of the silicone elbow onto the base of the air lter and secure it
in place, using one nylon cable tie; then, slip the long end of the air lter assembly
over the base of the carburettor and secure it in place, using a second nylon cable
tie.
IMPORTANT: The short end of the silicone elbow is attached to the air lter and the
long end is attached to the carburettor, otherwise it could foul the spur gear.

Page 12
Refer to the photo at left to familiarise yourself with your engine's carburettor. All of the
carburettor settings come preset from the factory for initial starting and break-in, but you
should have a small at blade screwdriver handy to make adjustments to the carburettor
during the break-in process, which will be detailed later.
CARBURETTOR FAMILIARISATION
The idle stop screw adjusts the closure of the carburettor barrel. The idle stop screw should
be adjusted so that the carburettor barrel stays open about 1mm / 1/16". Turning the idle
stop screw clockwise will cause the carburettor barrel to stay open more. Turning the idle
stop screw counterclockwise will allow the carburettor barrel to close more. If the carburettor
barrel stays open too far, the engine will idle very high and the clutch will never disengage.
This will wear out the clutch very quickly. If the idle stop screw is closed too far, the engine
may die during idle or when you engage the brakes. Ideally, the engine should idle smoothly,
yet slow enough so that the clutch stays disengaged.
IDLE STOP SCREW
The high speed needle valve is preset from the factory for the initial starting procedure.
Do not make adjustments to it at this time. The high speed needle valve is used to
meter the air/fuel mixture at full throttle. Turn the needle valve clockwise to lean the
mixture or turn the needle valve counterclockwise to richen the mixture.
Check to ensure that the high speed needle valve is set at 3 full turns out from
the fully closed position for the break-in process.
HIGH SPEED NEEDLE VALVE
The low speed needle valve is preset from the factory for the initial starting procedure.
Do not make adjustments to it at this time. The low speed needle valve meters the
air/fuel mixture at idle and during transition from idle to full throttle. Turn the needle valve
clockwise to lean the mixture. Turn the needle valve counterclockwise to richen the
mixture. The low speed needle valve is preset from the factory, but minor adjustments
may need to be made to suit your application: fuel used, glow plug and environment all
contribute to the setting. 
AFTER THE ENGINE HAS BEEN BROKEN IN.
LOW SPEED NEEDLE VALVE
Low Speed
Needle Valve
High Speed
Needle Valve
Idle Stop
Screw
RESETTING THE HIGH AND LOW SPEED NEEDLE VALVES TO THE FACTORY SETTINGS
There may come a time when you get the needle valve settings out of spec, resulting in poor engine performance or not even being able
to start the engine at all. If this occurs, reset both the high and low speed needle valves to their factory settings as described below:
RESETTING THE HIGH SPEED NEEDLE VALVE
lGently turn the high speed needle valve clockwise until it bottoms out (fully closed).
Do not force it or you may damage the carburettor.
lTurn the high speed needle valve counterclockwise (open) 3 full turns.
RESETTING THE LOW SPEED NEEDLE VALVE
lOpen the carburettor barrel completely.
l While holding the carburettor barrel open with your ngers, use a at blade screwdriver to gently turn the low speed needle valve
clockwise until it bottoms out (fully closed). Do not force it or you may damage the carburettor.
lFrom this point, turn the low speed needle valve counterclockwise (open) 3 full turns.
IMPORTANT: The factory settings listed above are for break-in. Once the engine is broken in, the needle valve settings will be
different, although these settings are good for getting your engine running again. Please be aware that you will need to retune
your engine for proper performance.
1mm
Turn Clockwise
to Lean
Turn
Counterclockwise
to Richen
Turn Clockwise
to Lean
Turn
Counterclockwise
to Richen

Page 13
qUsing your glow plug wrench, verify that the glow plug and its washer are installed
in the cylinder head and tight. If they're not already preinstalled, install them now.
q Lift the fuel tank lid and carefully ll the fuel tank until the fuel level is just below the
top of the fuel tank.
WARNING: Use fuel that is appropriate for nitro car engines. Do not use gasoline/petrol

for R/C nitro car engines that contains no more than 20% nitromethane.
An XTM Racing # 4 'medium' heat-range glow plug is included with your engine. We suggest having a couple of extra glow plugs handy,
because it can be expected that glow plugs will wear out quickly during the engine's break-in process. This glow plug will suit most users during
the break-in process, although you may or may not need to change to a different type of glow plug after the break-in process is complete.
There are a variety of different heat range glow plugs to suit your engine. Typically, use a hotter
glow plug if you're using 15% ~ 20% nitro fuel or are running in cooler ambient temperatures.
Hotter glow plugs typically improve idle and transition, too. Use a cooler glow plug if you're running
25% ~ 30% nitro fuel or are running in higher ambient temperatures. SEE TIP ON PAGE 16 ABOUT USING 30% NITRO FUEL.
IMPORTANT TIPS ABOUT GLOW PLUGS
XTM Racing # 3 Glow Plug - Hot
SH Engines # 5 Glow Plug - Cold
FUELING AND STARTING THE XTM RACING 24.7 NITRO ENGINE
If at any time the pull-starter becomes very tight or difcult to pull - STOP! The engine has become ooded and the excess fuel must
be removed from the engine or damage to the pull-starter and/or engine could occur. To remove the excess fuel from the engine
follow the procedures listed below:
lCompletely close the high speed needle valve (turn clockwise) until it bottoms out. Do this gently. Don't force it!
lRemove the glow plug and its washer from the cylinder head.
lWith a rag over the top of the engine, pull the pull-starter cord several times to expel the excess fuel from the engine.
lCheck to make sure that the glow plug has not been fouled, then reinstall it and its washer.
lReset the high speed needle valve 3 full turns out from bottom (fully closed).
WARNING!! PLEASE READ THIS INFORMATION BEFORE STARTING YOUR ENGINE FOR THE FIRST TIME!!
WARNING: Under no circumstances should you operate the engine without the air lter installed on the carburettor. The air lter
prevents dust and debris from entering the engine and damaging it. 
installed, the engine will be quickly damaged and require replacement of the piston and sleeve (liner).
q Prime the engine by rst opening the throttle completely and covering the exhaust
opening in the tuned pipe with your nger, then, pull the pull-starter cord several
times until you see fuel just start to enter the carburettor through the fuel line.
IMPORTANT: Do not pull the pull-starter cord all the way out or damage to the pull-starter
will occur. Use a couple of short pulls - about 18~20cm / 7~8" long.
q Remove your nger from the exhaust opening and close the throttle down to the
idle position.
qWhile holding the XST 4WD Truggy RTR rmly with one hand (keeping your hand
clear of any moving parts), carefully pull on the pull-starter cord 3 times, using short,
quick pulls to check for a ooded condition.
IMPORTANT: If you can't turn the engine over using the pull-starter, don't force it.
The engine is ooded. See the warning and resolution at the top of this page.
IMPORTANT: We recommend that you place the chassis on a dedicated car stand or similar so that all four wheels are suspended off the
ground. This ensures that your XST 4WD Truggy RTR does not accidentally drive away when starting the engine if the idle setting is too high.

Page 14
qConnect a fully charged glow starter to the top of the glow plug, making sure that the
glow starter is locked rmly onto the top of the glow plug. You don't want it to fall off
while you're trying to start the engine.
When the engine is new, it can sometimes be difcult to turn over using the pull-starter. You may nd you need to pull the pull-starter
harder than you expect. A trick to help this is to loosen the glow plug slightly, start the engine, then remove the glow starter and
retighten the glow plug. This effectively lessens the engine's compression, making it easier to turn over with the pull-starter.
NEW ENGINE STARTING TIP
qWith the throttle still in the idle position, hold the XST 4WD Truggy RTR rmly with
one hand and carefully pull on the pull-starter cord, using short, quick pulls, until the
engine starts.
qOnce the engine starts, release the pull-starter cord, allow the engine to run for about
10 seconds more, then remove the glow starter from the glow plug.
IMPORTANT: If the engine does not start after a dozen pulls, refer to the trouble-
shooting guide on page 24.
Until you're actually ready to break in the engine, do not run the engine for more than a few minutes. If you run the engine longer
without breaking in the engine properly, damage to the engine can occur. Break-in will be done in the next section.
WARNING ABOUT RUNNING YOUR ENGINE FOR THE FIRST TIME
PRO TIP: When you pinch the fuel line to stop the engine, you must pinch it hard and hold it. The engine will rev up quickly, then
stop. We suggest holding the XST 4WD Truggy RTR rmly whilst doing this, so that it doesn't lurch out of your hands.
qOnce the engine is running, to stop the engine, carefully pinch the fuel line with your
ngers until the engine stops. Make sure to pinch the fuel pick-up line and not the
fuel pressure line. The fuel pick-up line is the one connected to the carburettor.
WARNING: Be careful not to touch any parts of the engine or the tuned pipe because
they will be hot. Also be careful to avoid any moving parts.
BREAKING IN AND FINE-TUNING THE XTM RACING 24.7 NITRO ENGINE
The XTM Racing 24.7 nitro engine is an ABN engine. The cylinder sleeve (liner) is tapered at the top, causing severe resistance
when the piston moves through the top of the stroke. This is normal. When the engine heats up to operating temperature, this
resistance will decrease and the proper clearance will be achieved. The break-in procedure will guide you through the steps
necessary to properly break in your new engine. Please follow the steps closely.
FUEL RECOMMENDATION
For the break-in period you should use a fuel specically designed for R/C car engines that contains no more than 20% nitromethane
and 10~14% oil content. Once the engine has been adequately broken in (about 45 minutes of run-time) you can switch to an R/C car
fuel containing up to, but no more than, 30% nitromethane and 10~14% oil content.
WARNING: We do not recommend using fuels designed for R/C airplane engine use. These fuels do not contain the proper amount
of lubricants; therefore, they will cause the engine to overheat or run erratically and severe damage to the engine can result.

Page 15
The glow plug can make a big difference in how your engine performs. We recommend using a 'medium' or 'hot' heat-range glow plug
intended specically for performance engines like the XTM Racing # 4 or the
XTM Racing # 3 during the break-in process. After the break-in process you
may want to use a different heat-range glow plug. Do not use glow plugs
intended for four stroke airplane engines or glow plugs with an 'idle bar'.
Using the wrong type of glow plug will cause the engine to run erratically
and make it difcult to tune properly. The wrong type of glow plug could
also damage the engine.
GLOW PLUG RECOMMENDATION
AIR FILTER
The air lter is a very important part of your engine. Failure to use the air lter
will damage the engine in a very short period of time. Make sure that you
wet the air lter element with air lter oil and use a prelter sleeve if you are
driving in dusty or wet conditions. See page 11 for more information.
To make sure that you're not leaning out the
engine too much and overheating it during
the break-in process, we suggest using a
temperature gun to monitor the engine's
operating temperature.
During break-in, engine temperature
should not exceed 132ºC (270ºF). The
optimum engine operating temperature is
99~110ºC (210~230ºF). The minimum engine operating
temperature is 82ºC (180ºF).
ENGINE BREAK-IN TIP


the engine will be quickly damaged and require replacement of the piston and sleeve (liner).
STEP 1: BREAKING IN THE ENGINE USING THE HEAT CYCLING METHOD
WARNING: Do not adjust the low speed needle valve until after the engine has been broken in. You can begin to adjust the low
speed needle valve after you have broken in the engine and after you have read and understood Step 2: Fine Tuning the Engine
on the next page. The high speed needle valve is preset from the factory for easy starting in most conditions for the break-in period.
Break in the engine by running the XST 4WD Truggy RTR on a at surface (car park/parking lot, etc.) without the body shell tted. It's
important that the engine receive adequate airow during the break-in process, so as not to overheat.
ENGINE BREAK-IN TIP
q Follow the previous procedures to ll the fuel tank and start the engine.
qOnce the engine starts, keep the glow starter attached to the glow plug and let the engine run for about 10 seconds without giving
it throttle. This will allow the engine to warm up.
qAfter the engine has been running for about 10 seconds, remove the
glow starter from the glow plug. Advance the throttle in short, quick
bursts and drive the XST 4WD Truggy RTR for about 2~3 minutes. If
the engine is running rich enough, you should notice smoke coming from the tuned pipe and the engine should sound like it’s running
very rough. Also, the XST 4WD Truggy RTR will barely be moving because the engine is running so rich that it won't produce much
power. This is what you want for now. If smoke isn't coming from the tuned pipe, richen the high speed needle valve 1/4 of a turn
(turn counterclockwise). After 2~3 minutes stop the engine by pinching the fuel line to the carburettor.
qLet the engine cool for approximately 10 minutes, then restart it. Set the high speed needle valve mixture to a slightly leaner setting,
about 1/8 of a turn more in (turn clockwise). Repeat the procedure above, advancing the throttle in short, quick bursts and driving
the XST 4WD Truggy RTR for about 2~3 minutes, then stop the engine again and let it cool for approximately 10 minutes.
qRepeat the procedure above, leaning the high speed needle valve about 1/8 of a turn more each time (turn clockwise). In all, you should
run the engine a total of about 45 minutes. After 45 minutes of run-time the engine will be broken in. Run the engine with the high
speed needle valve set slightly rich, but lean enough to power the XST 4WD Truggy RTR adequately. At this point the engine should
hold a good setting on the high speed needle valve and you can begin to ne tune the needle valve settings to increase performance.
IMPORTANT: It is of the utmost importance that the engine never be leaned out too much. When running the engine, you should
always be able to see a slight trail of smoke coming from the tuned pipe. If you can’t, stop the engine immediately and richen the
high speed needle valve (turn counterclockwise). You should also make sure there is plenty of air owing over the cylinder head to
keep the engine from overheating.
No two engines will have the exact same needle valve settings once broken in. Different fuels used, different types and heat-ranges of
glow plugs, the outside air temperature and air pressure all affect the engine. The factory needle valve settings on page 12 are break-in
settings. If you reset the needle valves to the factory settings, the engine will run very rich and you will need to retune the engine.
ENGINE TUNING TIP
During the break-in process, it's normal for excess fuel oil
and exhaust residue to drip from the tuned pipe.
ENGINE BREAK-IN TIP

Page 16
If, during the break-in process, the pull-starter slips when you try to start
the engine, the one-way bearing and pull-starter shaft may be coated with
excess fuel oil. This can occur because the excess oil in the engine during the
break-in process gets into the one-way bearing. To x this, carefully remove the
one-way bearing and the pull-starter shaft, clean them with rubbing alcohol and
reassemble the parts. Use the exploded parts view to see how the parts are
assembled. Also, be careful when removing the pull-starter assembly to ensure
that the recoil spring does not uncoil and y out. After removing the screws
securing the pull-starter, carefully insert a at blade screwdriver between the
engine backplate and the pull-starter. Apply slight pressure against the
pull-starter to help prevent the recoil spring from uncoiling. Temporarily secure
the pull-starter with a rubber band or tape while cleaning the one-way parts and be very careful when reassembling the unit.
The use of eye protection during this procedure is strongly recommended.
ENGINE BREAK-IN TIP - WHY IS MY PULL-STARTER SLIPPING?
One-Way
Bearing
O-Ring
Backplate
Backplate
Bolts
Pull-Starter
Shaft
Cushion
Spring
Pull-Starter
Cord
Spool
Recoil
Spring
Pull-Starter Handle and
Cover Assembly
Retaining Bolts
STEP 2: FINE TUNING THE ENGINE
After your engine has been broken in, you can set the high and low speed needle valves for optimum engine performance.
Be careful to never lean out the engine too much. Remember that the lubricants for your engine are suspended in the fuel. If you
lean out the fuel mixture too much you will also be lowering the amount of lubricant entering your engine. Less lubricant means more
chance of your engine overheating and possible engine failure.
WARNING ABOUT TUNING YOUR ENGINE
qStart the engine and remove the glow starter from the glow plug, then allow the engine to warm up for about 10 seconds.
qAfter the engine has warmed up, drive the XST 4WD Truggy RTR as you normally would. If the engine seems to be running rich (i.e., not
reaching maximum power), lean the high speed needle valve about 1/16 of a turn (turn clockwise) at a time until the desired setting is
achieved. Use a temperature gun to ensure that the engine is within the suggested temperature range 99~110ºC (210~230ºF) and
always make sure that you run the engine slightly rich - you want to be able to see a faint exhaust trail at all times.
SETTING THE HIGH SPEED NEEDLE VALVE
qStart the engine and lean out the high speed needle valve as per the procedures above. Close the throttle until the engine slows
down enough so that the clutch is disengaged and the wheels don’t turn when the XST 4WD Truggy RTR is lifted from the ground.
Allow the engine to idle for about 10~15 seconds.
qWhile holding the XST 4WD Truggy RTR off the ground (making sure to keep your ngers away from any moving parts), quickly open the
throttle in a short burst. If the engine just stops running as soon as the throttle is advanced, the low speed needle valve is too lean and
the engine is not getting enough fuel. With the engine stopped, richen the low speed needle valve about 1/16 of a turn (turn counterclock-
wise).
qRestart the engine and repeat the procedure above until the engine will transition smoothly and quickly. Very slight hesitation in the
transition is normal.
qIf you quickly advance the throttle and the engine seems to be very rich during transition (i.e., lots of smoke coming from the tuned
pipe and very rough sounding), the low speed needle valve is too rich and the engine is getting too much fuel. With the engine
stopped, lean the low speed needle valve about 1/16 of a turn (turn clockwise).
qRestart the engine and repeat the procedure above until the engine will transition smoothly and quickly. Very slight hesitation in the
transition is normal.
qNow drive the XST 4WD Truggy RTR as you normally would for a while to get a feel for how the engine reacts to throttle. Now that you
SETTING THE LOW SPEED NEEDLE VALVE
To get more power from your engine you can use fuel containing up to 30% nitromethane. We must caution you, though,
that once you run the engine with increased nitro you may not get satisfactory results if you decide to go back to a lower
nitro content. Also, if you use fuel containing 30% nitro, we suggest adding a .10mm head gasket to lower the compression
ratio. If you don’t lower the compression ratio, overheating and erratic running will likely occur. You may also nd it
necessary to run a 'cold' heat-range glow plug to ensure satisfactory results.
PLEASE READ IF USING 30% NITRO FUEL
P/N 148418
.10mm

Page 17
BASIC ENGINE MAINTENANCE
To keep your engine operating at peak performance there are some basic maintenance procedures that need to be performed on your
engine on a regular basis:
l After you are nished running the engine for the day, pinch the fuel line to stop the engine. This will allow the engine to burn any
excess fuel out of the crankcase.
l Remove the air lter element and wash it thoroughly in warm water and a small amount of liquid detergent. After it's clean, allow it to
dry, then reoil it and install it back into the air lter housing.
lRemove the glow plug and its washer from the engine and squirt several drops of high-quality after-run oil into the glow plug hole and
the carburettor opening. Pull the pull-starter cord several times to distribute the oil throughout the engine, then reinstall the glow plug
and its washer. The after-run oil will prevent the inside of the engine (especially the crankshaft bearings) from rusting.
lClean the outside of the engine using a stiff brush and nitro
car cleaner, then dry the engine, using a rag or compressed
air.
lPeriodically check the condition of the clutch for wear.
lPeriodically oil the clutch bell bearings.
lCheck the engine's cylinder head bolts and backplate bolts
after each day of use to ensure that they're tight. This will
prevent air leaks from causing erratic engine performance.
Loop four nylon cable ties around
the corners of the engine's cylinder
head, making sure that the ratchet
portion of the cable ties are up
toward you. When your XST 4WD
Truggy RTR ips over, the cable
ties will help prevent the cylinder
head from being scratched.
ENGINE TIP
CHASSIS TUNING GUIDE
IMPORTANT: It's very important when making changes to the settings of your XST 4WD Truggy RTR that you make the settings
the same for each side. For example, if you change the spring tension on the right front shock, you should change the spring tension
on the left front shock the same amount, etc.
Do not make any changes that are more than 3 degrees from the initial settings or the handling characteristics of your XST 4WD
Truggy RTR will become very poor.
Chassis alignment and geometry are important if you want your XST 4WD Truggy RTR to perform well. A good performing truck
means a truck that is easier to drive, too. Follow our guidelines in this section to get the most out of your XST 4WD Truggy RTR.
INSTALLING THE BODY SHELL
STEP 1: APPLYING THE DECALS
qFor your convenience, some of the decals have already been applied to the body shell. To apply the remaining decals to the body
shell, simply remove them from the protective backing sheet and apply them to the body shell as you like.
STEP 2: INSTALLING THE BODY
qFit the body shell onto the chassis, using the body clips provided.
qFit the wing to the wing mount, using the long body clip provided.
qDouble-check that the body shell does not interfere with the wheels, the suspension,
the engine's cylinder head or the tuned pipe. If it does, you will need to trim the body
shell slightly to t around those areas.
PRO TIP: Other than during the break-in period, always make sure that you t the body shell when driving your XST 4WD Truggy
RTR. When your XST 4WD Truggy RTR ips over, the body shell will help protect the chassis and its components.

Page 18
The toe angle is the angle of both front tyres (or rear tyres) to each other, when viewed from above. Toe-in is when the front of both
tyres point toward each other and toe-out is when the front of both tyres point away from each other.
lFor the front tyres, toe-in will make the XST 4WD Truggy RTR track (run) straighter, but the steering will be more sensitive. Toe-out
will desensitise the steering, making the XST 4WD Truggy RTR a little more driver-friendly.
lFor the rear tyres, if you're running on a smooth surface, we suggest no toe-in. If you are running on a rough surface, we suggest
about 1~2 degrees of toe-in. This will give the rear end a little more 'bite' (traction).
qRemove the two 4x16mm F/H TP screws from the bottom of the chassis that hold the
suspension holder support in place, then remove the suspension holder support from
the chassis.
qRemove the two 4x12mm TP screws that hold the suspension holder in place, then
carefully pull out the suspension holder, being careful not to pull out the hinge pins.
qInstall the desired suspension holder. Installation is the reverse of the disassembly
procedure.
qTo adjust the toe-angle of the front tyres, turn the tie-rods (steel rods connecting each wheel to the steering arm) in or out with the
adjustable wrench provided.
qT
o adjust the toe-in on the rear tyres, use one of the different suspension holders provided to set the desired toe angle, as described in the
procedures below. For convenience, the degree of toe angle is moulded into the back of each suspension holder.

l0 degrees toe-in on the front and 2 degrees on the rear for overall best 4WD driveability
on most surfaces. 2 degrees toe-in on the rear is stock.
+Adding more than 3 degrees of toe-in or toe-out on the front will result in excessive
loss of speed and erratic handling. Toe adjustments should be measured with the
XST 4WD Truggy RTR at its normal ride height.
RECOMMENDED INITIAL SETTINGS
PRO TIP: For more precise toe angle adjustments, use a dedicated toe angle
adjustment gauge, available at most hobby retailers.
Straight - No Toe
Toe-In
Toe-Out
Camber is referred to as the amount of the tyre's surface that contacts the ground. Tyres that are exactly perpendicular to the ground
have 0 degrees of camber. If the top of the tyre leans in toward the chassis, the tyre has negative camber. If the top of the tyre leans
out away from the chassis, the tyre has positive camber.

lFor driving on smooth surfaces set both the front and back tyres at 0 degrees.
lFor driving on rough surfaces set the front tyres at -1 degree and the back tyres at -2 degrees.
RECOMMENDED INITIAL SETTINGS
qAdjust the camber angle of the tyres by turning the upper turnbuckles in or out using the adjustable wrench provided.
+Camber settings should be measured
with the XST 4WD Truggy RTR at its
normal ride height.
PRO TIP: For more precise camber
adjustments, use a dedicated camber
gauge, available at most hobby retailers.
Negative
Camber Positive
Camber

Page 19

With both the transmitter and the receiver turned on, and the throttle trim and the servo arm centred, the XST 4WD Truggy RTR should
roll forward smoothly when pushed (i.e., the brakes should be disengaged). If the brakes are dragging when the throttle trigger is at
neutral, the brake discs will wear out very quickly. To ensure that the brakes are disengaged, always make sure that there is a 1mm /
1/16" wide gap between the two rear collars and the two brake levers. Both collars should be adjusted so that they are equal distance
behind each of the two brake levers. This will ensure that both brake levers engage equally during braking.

Since the front and rear brakes can be adjusted independently of each other, you may not want both front and rear brakes to engage at
the same time. If you want the rear brakes to engage just before the front brakes, move the collar at the front brake lever just a fraction
further back from neutral. This will result in the rear brakes engaging just before the front brakes. If you want the front brakes to engage
just before the rear brakes, move the collar at the rear brake lever just a fraction further back from neutral. This will result in the front
brakes engaging just before the rear brakes. Experimentation will be necessary to achieve the desired braking response, dependant
on your track conditions and driving style.
lWe suggest initially leaving the brake linkage collars in the factory positions, then
readjust them after driving your XST 4WD Truggy RTR a couple of times.
RECOMMENDED INITIAL SETTINGS
qTo make adjustments to the brake linkage, simply loosen the grub screw in the collars
behind the brake levers and reposition them, then retighten the grub screws.
Moving the collars forward, toward the brake levers, will result in the brakes
coming on sooner and more forcefully.
By adjusting the spring tension of the shocks, you can increase steering sensitivity, adjust the ride-height of the XST 4WD Truggy RTR and
ne-tune the damping quality of the suspension system. How you drive your XST 4WD Truggy RTR will dictate what settings you should
be using. As an example, if you're driving your XST 4WD Truggy RTR off-road and going over lots of jumps, you may want to increase the
spring tension of the front shocks to help prevent the front of the XST 4WD Truggy RTR from bottoming out. If you're racing your XST 4WD
Truggy RTR, local track conditions will dictate the settings to use.

lWe recommend initially leaving all of the adjustment rings at their factory settings.
qIncrease or decrease spring tension by threading the adjustment ring up or down the
shock body. Threading the ring down increases spring tension and the chassis's ride
height, and will stiffen the overall damping characteristics of the suspension. Threading
the ring up decreases spring tension and makes the damping characteristics of the
suspension softer.
+When adjusting the spring tension, make sure to adjust the right and left shocks equally.
RECOMMENDED INITIAL SETTINGS
Shock springs are easy to change and can make a difference in the way your XST 4WD Truggy RTR handles relative to the type of
terrain you're driving on. If you drive your XST 4WD Truggy RTR off-road, in a smooth, high-traction area, use stiffer springs to reduce
body roll and weight shift. If the area where you drive your XST 4WD Truggy RTR is very bumpy, you might consider using softer springs
to help absorb the bumps. If the area is bumpy and you use harder springs, the XST 4WD Truggy RTR will have a tendency to jump and
hop around. The shock springs included with the XST 4WD Truggy RTR are suitable for most general off-road applications.
P/N 149370 80.5mm 1.4mm Shock Spring (BLUE)
P/N 149366 80.5mm 1.5mm Shock Spring (WHITE)
P/N 149363 80.5mm 1.6mm Shock Spring (YELLOW) - STOCK
P/N 149364 80.5mm 1.7mm Shock Spring (BLACK)
FRONT and REAR
CHANGING THE SHOCK SPRINGS
SOFT
STIFF

Page 20

Changing the shock oil (the oil inside the shocks) will change the damping characteristics of the shocks. Typically, if you are running on
smooth surfaces, use a heavier weight oil. If you are running on rough surfaces, use a lighter weight oil.
# 400 (40 weight) shock oil is stock. This is good for all-around use. For racing, you may want to consider using # 250~# 500
(25~50 weight) shock oil.
The front upper hinge pins can be moved up or down to adjust bump steer. Generally, if you move the hinge pins into a lower position,
this will increase bump steer, which can be helpful on tight tracks. For a larger track, you may want to move the hinge pins to a higher
position to decrease bump steer.

lWe recommend initially leaving the front upper hinge pins in the factory locations.
qAdjust bump steer by removing the upper hinge pins and reinstalling them, along with
the upper suspension arms, in a hole either further up or lower down in the upper
suspension plate.
RECOMMENDED INITIAL SETTINGS
IMPORTANT: When tightening the hex nuts on the back of the hinge pins, be careful not to overtighten them or the suspension
arms may not pivot freely. When adjusting the hinge pin positions, make sure to adjust the right and left sides equally.
The XST 4WD Truggy RTR shock towers feature a number of different mounting positions for the shocks. By changing the location of
the upper shock mounts you can make the shock feel stiffer or softer as the XST 4WD Truggy RTR rolls from side-to-side. In general,
moving the shocks toward the outside will make the shock stiffer and moving the shock toward the inside will make the shock softer.
You will need to experiment with these settings to nd something that suits both your track and driving style. A good starting point is
to adjust the rear shocks. Moving the rear shocks toward the outside will give more 'bite' (traction) in the turns; however, depending on
how you drive, you might want to move the shocks toward the middle. This will give a more 'plush' suspension.

l We recommend using the # 400 shock oil that the shocks are already lled with.
qRemove the shock, then carefully unscrew the shock cap. Pull the shock piston down
completely, then empty the shock oil from the shock. Fill the shock body with shock oil
until the oil level is just below the top of the shock body, then, gently pump the shock
piston up and down to dissipate any air bubbles from the shock oil. Top off the shock
oil level if necessary, before reinstalling the shock cap and diaphragm.
RECOMMENDED INITIAL SETTINGS
lWe recommend initially leaving the shock mounting positions in their factory locations.
q Change the shock mounting positions by rst removing the top of the shock from the
shock mount, then by removing the shock mount from the shock tower. Reinstall the
shock mount, then the top of the shock into the desired position on the shock tower.
Make sure to adjust the right and left sides equally.
RECOMMENDED INITIAL SETTINGS
IMPORTANT: Use only 100% silicone oil in the shocks. Do not use motor oil.