Xray X4F User manual

2
BEFORE YOU START
This is a high-competition, high-quality RC car intended for persons aged 16
years and older with previous experience building and operating RC model
racing cars. This is not a toy; it is a precision racing model. This model racing
car is not intended for use by beginners, inexperienced customers, or by
children without direct supervision of a responsible, knowledgeable adult. If
you do not fulfill these requirements, please return the kit in unused and
unassembled form back to the shop where you have purchased it.
Before building and operating your XRAY, YOU MUST read through all of the
operating instructions and instruction manual and fully understand them to
get the maximum enjoyment and prevent unnecessary damage.
Read carefully and fully understand the instructions before beginning assembly.
Make sure you review this entire manual, download and use set-up book from
the web, and examine all details carefully. If for some reason you decide this is
not what you wanted or expected, do not continue any further. Your hobby dealer
can not accept your kit for return or exchange after it has been partially or fully
assembled.
Contents of the box may differ from pictures. In line with our policy of continuous
product development, the exact specifications of the kit may vary without prior
notice.
SAFETY PRECAUTIONS
Contains:
LEAD (CAS 7439-92-1) ANTIMONY (CAS 7440-36-0)
WARNING: This product contains a chemical known to the state of California
to cause cancer and birth defects or other reproductive harm.
CAUTION: CANCER HAZARD
Contains lead, a listed carcinogen. Lead is harmful if ingested. Wash
thoroughly after using. DO NOT use product while eating, drinking or using
tobacco products. May cause chronic effects to gastrointestinal tract, CNS,
kidneys, and blood. MAY CAUSE BIRTH DEFECTS.
When building, using and/or operating this model always wear protective
glasses and gloves.
Take appropriate safety precautions prior to operating this model. You are
responsible for this model‘s assembly and safe operation! Please read the
instruction manual before building and operating this model and follow all
safety precautions. Always keep the instruction manual at hand for quick
reference, even after completing the assembly. Use only genuine and original
authentic XRAY parts for maximum performance. Using any third party parts
on this model will void guaranty immediately.
Improper operation may cause personal and/or property damage. XRAY
and its distributors have no control over damage resulting from shipping,
improper construction, or improper usage. XRAY assumes and accepts no
responsibility for personal and/or property damages resulting from the use
of improper building materials, equipment and operations. By purchasing
any item produced by XRAY, the buyer expressly warrants that he/she is in
compliance with all applicable federal, state and local laws and regulation
regarding the purchase, ownership and use of the item. The buyer expressly
agrees to indemnify and hold harmless XRAY for all claims resulting directly
or indirectly from the purchase, ownership or use of the product. By the act
of assembling or operating this product, the user accepts all resulting liability.
If the buyer is not prepared to accept this liability, then he/she should return
this kit in new, unassembled, and unused condition to the place of purchase.
IMPORTANT NOTES – GENERAL
• This product is not suitable for children under 16 years of age without the
direct supervision of a responsible and knowledgeable adult.
• Carefully read all manufacturers warnings and cautions for any parts used
in the construction and use of your model.
• Assemble this kit only in places away from the reach of very small children.
• First-time builders and users should seek advice from people who have
building experience in order to assemble the model correctly and to allow
the model to reach its performance potential.
• Exercise care when using tools and sharp instruments.
• Take care when building, as some parts may have sharp edges.
• Keep small parts out of reach of small children. Children must not be
allowed to put any parts in their mouth, or pull vinyl bag over their head.
• Read and follow instructions supplied with paints and/or cement, if used
(not included in kit).
• Immediately after using your model, do NOT touch equipment on the
model such as the motor and speed controller, because they generate high
temperatures. You may seriously burn yourself seriously touching them.
• Follow the operating instructions for the radio equipment at all times.
• Do not put fingers or any objects inside rotating and moving parts, as this
may cause damage or serious injury as your finger, hair, clothes, etc. may
get caught.
• Be sure that your operating frequency is clear before turning on or running
your model, and never share the same frequency with somebody else at the
same time. Ensure that others are aware of the operating frequency you
are using and when you are using it.
• Use a transmitter designed for ground use with RC cars. Make sure that no
one else is using the same frequency as yours in your operating area. Using
the same frequency at the same time, whether it is driving, flying or sailing,
can cause loss of control of the RC model, resulting in a serious accident.
• Always turn on your transmitter before you turn on the receiver in the car.
Always turn off the receiver before turning your transmitter off.
• Keep the wheels of the model off the ground when checking the operation
of the radio equipment.
• Disconnect the battery pack before storing your model.
• When learning to operate your model, go to an area that has no obstacles
that can damage your model if your model suffers a collision.
• Remove any sand, mud, dirt, grass or water before putting your model
away.
• If the model behaves strangely, immediately stop the model, check and
clear the problem.
• To prevent any serious personal injury and/or damage to property, be
responsible when operating all remote controlled models.
• The model car is not intended for use on public places and roads or areas
where its operation can conflict with or disrupt pedestrian or vehicular traffic.
• Because the model car is controlled by radio, it is subject to radio
interference from many sources that are beyond your control. Since radio
interference can cause momentary loss of control, always allow a safety
margin in all directions around the model in order to prevent collisions.
• Do not use your model:
- Near real cars, animals, or people that are unaware that an RC car is being
driven.
- In places where children and people gather
- In residential districts and parks
- In limited indoor spaces
- In wet conditions
- In the street
- In areas where loud noises can disturb others, such as hospitals and
residential areas.
- At night or anytime your line of sight to the model may be obstructed or
impaired in any way.
To prevent any serious personal injury and/or damage to property, please be
responsible when operating all remote controlled models.
CUSTOMER SUPPORT
XRAY Europe
K Vystavisku 6992
91101 Trenčín
Slovakia, EUROPE
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
We have made every effort to make these instructions as easy to understand as
possible. However, if you have any difficulties, problems, or questions, please do not
hesitate to contact the XRAY support team at [e-mail]. Also, please visit
our Web site at www.teamxray.com to find the latest updates, set-up information,
option parts, and many other goodies. We pride ourselves on taking excellent care
of our customers.
You can join thousands of XRAY fans and enthusiasts in our online community at:
www.teamxray.com
XRAY USA
RC America, 2030 Century Center Blvd #15
Irving, TX 75062
USA
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
FAILURE TO FOLLOW THESE INSTRUCTIONS WILL BE CONSIDERED AS ABUSE AND/OR NEGLECT.

3
IMPORTANT NOTES – ELECTRICAL
• Insulate any exposed electrical wiring (using heat shrink tubing or electrical
tape) to prevent dangerous short circuits. Take maximum care in wiring,
connecting and insulating cables. Make sure cables are always connected
securely. Check connectors for if they become loose. And if so, reconnect
them securely. Never use RC models with damaged wires. A damaged wire
is extremely dangerous, and can cause short-circuits resulting in fire. Please
have wires repaired at your local hobby shop.
• Low battery power will result in loss of control. Loss of control can occur due
to a weak battery in either the transmitter or the receiver. Weak running
battery may also result in an out of control car if your car‘s receiver power is
supplied by the running battery. Stop operation immediately if the car starts
to slow down.
• When not using RC model, always disconnect and remove battery.
• Do not disassemble battery or cut battery cables. If the running battery
short-circuits, approximately 300W of electricity can be discharged, leading
to fire or burns. Never disassemble battery or cut battery cables.
• Use a recommended charger for the receiver and transmitter batteries
and follow the instructions correctly. Over-charging, incorrect charging,
or using inferior chargers can cause the batteries to become dangerously
hot. Recharge battery when necessary. Continual recharging may damage
battery and, in the worst case, could build up heat leading to fire. If battery
becomes extremely hot during recharging, please ask your local hobby
shop for check and/or repair and/or replacement.
• Regularly check the charger for potential hazards such as damage to the
cable, plug, casing or other defects. Ensure that any damage is rectified
before using the charger again. Modifying the charger may cause short-
circuit or overcharging leading to a serious accident. Therefore do not
modify the charger.
• Always unplug charger when recharging is finished.
• Do not recharge battery while battery is still warm. After use, battery retains
heat. Wait until it cools down before charging.
• Do not allow any metal part to short circuit the receiver batteries or other
electrical/electronic device on the model.
• Immediately stop running if your RC model gets wet as may cause short
circuit.
• Please dispose of batteries responsibly. Never put batteries into fire.
WARRANTY
XRAY guarantees this model kit to be free from defects in both material and
workmanship within 30 days of purchase. The total monetary value under
warranty will in no case exceed the cost of the original kit purchased. This
warranty does not cover any components damaged by use or modification
or as a result of wear. Part or parts missing from this kit must be reported
within 30 days of purchase. No part or parts will be sent under warranty
without proof of purchase. Should you find a defective or missing part, contact
the local distributor. Service and customer support will be provided through
local hobby store where you have purchased the kit, therefore make sure to
purchase any XRAY products at your local hobby store. This model racing car
is considered to be a high-performance racing vehicle. As such this vehicle
will be used in an extreme range of conditions and situations, all which may
cause premature wear or failure of any component. XRAY has no control over
usage of vehicles once they leave the dealer, therefore XRAY can only offer
warranty against all manufacturer‘s defects in materials, workmanship, and
assembly at point of sale and before use. No warranties are expressed or
implied that cover damage caused by what is considered normal use, or cover
or imply how long any model cars‘ components or electronic components will
last before requiring replacement.
Due to the high performance level of this model car you will need to
periodically maintain and replace consumable components. Any and all
warranty coverage will not cover replacement of any part or component
damaged by neglect, abuse, or improper or unreasonable use. This includes
but is not limited to damage from crashing, chemical and/or water damage,
excessive moisture, improper or no maintenance, or user modifications which
compromise the integrity of components. Warranty will not cover components
that are considered consumable on RC vehicles. XRAY does not pay nor refund
shipping on any component sent to XRAY or its distributors for warranty. XRAY
reserves the right to make the final determination of the warranty status of
any component or part.
Limitations of Liability
XRAY makes no other warranties expressed or implied. XRAY shall not be liable
for any loss, injury or damages, whether direct, indirect, special, incidental,
or consequential, arising from the use, misuse, or abuse of this product and/
or any product or accessory required to operate this product. In no case shall
XRAY‘s liability excess the monetary value of this product.
Take adequate safety precautions prior to operating this model. You
are responsible for this model’s assembly and safe operation.
Disregard of the any of the above cautions may lead to accidents,
personal injury, or property damage. XRAY MODEL RACING CARS
assumes no responsibility for any injury, damage, or misuse of this
product during assembly or operation, nor any addictions that may
arise from the use of this product.
All rights reserved.
QUALITY CERTIFICATE
XRAY MODEL RACING CARS uses only the highest quality materials, the
best compounds for molded parts and the most sophisticated manufacturing
processes of TQM (Total Quality Management). We guarantee that all parts
of a newly-purchased kit are manufactured with the highest regard to quality.
However, due to the many factors inherent in model racecar competition, we
cannot guarantee any parts once you start racing the car. Products which have
been worn out, abused, neglected or improperly operated will not be covered
under warranty.
We wish you enjoyment of this high-quality and high-performance RC car and
wish you best success on the track!
In line with our policy of continuous product development, the exact specifications of the kit may
vary. In the unlikely event of any problems with your new kit, you should contact the model shop
where you purchased it, quoting the part number.
We do reserve all rights to change any specification without prior notice. All rights reserved.
R/C & BUILDING TIPS
• Make sure all fasteners are properly tightened. Check them periodically.
• Make sure that chassis screws do not protrude from the chassis.
• For the best performance, it is very important that great care is taken to
ensure the free movement of all parts.
• Clean all ball-bearings so they move very easily and freely.
• Tap or pre-thread the plastic parts when threading screws.
• Self-tapping screws cut threads into the parts when being tightened. Do
not use excessive force when tightening the self-tapping screws because
you may strip out the thread in the plastic. We recommended you stop
tightening a screw when you feel some resistance.
• Ask your local hobby shop for any advice.
Please support your local hobby shop. We at XRAY Model Racing Cars support
all local hobby dealers. Therefore we ask you, if at all possible, to purchase
XRAY products at your hobby dealer and give them your support like we do.
If you have difficulty finding XRAY products, please check out www.teamxray.
com to get advice, or contact us via email at [e-mail], or contact
the XRAY distributor in your country.

4
EQUIPMENT REQUIREDINCLUDED
(HUDY #106210)
Premium Graphite Grease
Transmitter Steering ServoReceiver
Lexan™ Paint
Battery Charger
Speed Controller
LiPo BatteryElectric Motor Pinion Gear
with Setscrew
Double-sided Tape
(HUDY #107875)
TL
CA
OIL
CA glueThreadlockBearing Oil
(HUDY #106230)
OIL
350cSt (#106335)
HUDY Premium Silicone Oils
* Kit includes smaller but sufficient amount
of oil and grease to build the car.
500.000cSt (#106650)
HUDY Premium Silicone Oils
TOOLS REQUIRED
Allen 1.5mm (#111545 - HUDY EXCLUSIVE Limited Edition)
Allen 2.0mm (#112045 - HUDY EXCLUSIVE Limited Edition)
Allen 3.0mm (#113045 - HUDY EXCLUSIVE Limited Edition)
Ball Allen 3.0mm (#133045 - HUDY EXCLUSIVE Limited Edition)
Socket 5.5mm (#175535 - HUDY EXCLUSIVE Limited Edition)
Socket 7.0mm (#177035 - HUDY EXCLUSIVE Limited Edition)
Reamer (#107602 - HUDY EXCLUSIVE Limited Edition)
Turnbuckle Wrench 3mm (HUDY #181030)
Turnbuckle Wrench 4mm (HUDY #181040)
Special Tool for turnbuckles, nuts (HUDY #181090)
Pocket Hobby Knife (HUDY #188981)
Side Cutters
(HUDY #189010)
Combination Pliers
(HUDY #189020)
Professional Multi Tool
(HUDY #183011)
Screwdriver 3.0mm (#153055 - HUDY EXCLUSIVE Limited Edition)
Tweezer Scissors (HUDY #188990)
OIL
Wheels & Tires & Inserts
(HUDY #803040 SLICK PRECUT) 190mm Bodyshell
Fibre Tape
(HUDY #107870)

5
CHASSIS PREPARATION
VIDEO TECH TIP
▶
CHASSIS PREPARATION
At the beginning of each section is an exploded view of the parts to be assembled. There is also a list of all
the parts and part numbers that are related to the assembly of that section.
The part descriptions are color-coded to make it easier for you to identify the source of a part. Here are
what the different colors mean:
STYLE A - indicates parts that are included in the bag marked for the section.
STYLE B - indicates parts that are included in the box.
STYLE C - indicates parts that are already assembled from previous steps.
COLOR INDICATIONS
301015
304901
304911
BUILD TIPS & NOTES
XRAY offers wide range of optional tuning parts
which are listed in a table like this. Please refer
to the exploded view of each main section to verify
which part is included in the kit while all other parts
are available only as an optional part and must be
purchased separately.
SAMPLE OF OPTIONAL PARTS
#30XXXX TYPE1 OPTION 1
#30XXXX TYPE1 OPTION 2
#30XXXX TYPE1 INCLUDED
#30XXXX TYPE1 OPTION 3
CA
CA
Apply only a bit of CA glue in the countersunk holes.
To protect and seal edges of graphite parts, sand edges smooth and then apply CA glue.
Do this for: chassis edges and countersunk holes.
CA
Apply only a bit of CA glue in the countersunk holes.
VIDEO TECH TIP
▶
When a QR CODE is found in the instruction manual, scan the code to be
directed to an online video that explains that feature or adjustment in more
detail. Make sure to watch all of the instructional videos to get the most
performance out of your car.
NOTE!
Please note that the videos are made specifically for the X4, but will contain
very good information that may apply to the X4F as well.
Alexander Hagberg (Factory Driver)

6
1. GEAR DIFFERENTIAL
981210
P 2x10
972050
O 5x2
964050
S 5x15x0.3
➊
➋
➌
➍
➍➍
➎
➎
DETAIL
➎
STEP
304901 X4 GEAR DIFFERENTIAL - SET
304911 X4 COMPOSITE GEAR DIFF. CASE WITH 38T PULLEY & COVER
304930 COMPOSITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4)
304970 ALU GEAR DIFF OUTDRIVE ADAPTER - 7075 T6 (2)
304980 COMPOSITE GEAR DIFF CROSS PIN
304990 DIFF GASKET (4)
903258 HEX SCREW SFH M2.5x8 (10)
941015 BALL-BEARING 10x15x4 RUBBER SEALED - OIL (2)
964031 WASHER S 3.5x10x0.2 (10)
964050 WASHER S 5x15x0.3 (10)
971240 SILICONE O-RING 24x0.7 (10)
972050 SILICONE O-RING 5x2 (10)
981210 PIN 2x10 (10)
BAG
981210
964050
304930
971240
972050
304911
981210
941015
304930
304970
941015
304911
964031
304990
903258
304970
304980
972050
#304932
GRAPHITE GEAR DIFF BEVEL &
SATELLITE GEARS (2+4)
#304932
GRAPHITE GEAR DIFF BEVEL &
SATELLITE GEARS (2+4)
DETAIL
#304971
HUDY SPRING STEEL™ OUTDRIVES (2)
#304971
HUDY SPRING STEEL™ OUTDRIVES (2)
If the diff is not turning freely after
assembly, use thin sand paper to
lightly polish the surface.

7
REAR DIFFERENTIAL
VIDEO TECH TIP
▶
964031
S 3.5x10x0.2
1. GEAR DIFFERENTIAL1. GEAR DIFFERENTIAL
TIPS FOR DIFFERENTIALS
To make sure that all the air is removed from the diff oil, we recommend
using the HUDY Air Vac.
If softer oil is used, the car has better
rotation, but traction decreases.
If harder oil is used, the car has more
forward traction and is more stable, but
rotation decreases.
100.000cSt (HUDY #106610)
150.000cSt (HUDY #106615)
200.000cSt (HUDY #106620)
300.000cSt (HUDY #106630)
500.000cSt (HUDY #106650) INITIAL SETTING
1 000.000cSt (HUDY #106692)
2 000.000cSt (HUDY #106694)
SOFTER
HARDER
#104002
HUDY AIR VAC – VACUUM PUMP
Use tweezers to
insert pin.
981210
P 2x10
972050
O 5x2
964050
S 5x15x0.3
➊
➋
➌
➍
➎
STEP DETAIL
Fill differential up to the top of the diff pin.
DO NOT fill the diff to the top of the housing.
If the cross does not enter into the
diff freely, use fine sand paper to
lightly polish the ends of the cross.
TO ENSURE YOU HAVE THE SAME AMOUNT OF OIL FROM REBUILD TO REBUILD, DO THE FOLLOWING:
#107865
HUDY Ultimate Digital Pocket
Scale 300g±0.01g
INITIAL SETTING
500.000cSt
➍
NOTE
ORIENTATION
If the diff is not turning freely after
assembly, use thin sand paper to
lightly polish the surface.
➊ Put the diff (without oil) on the scale and check the
weight (approximately 9.50g)
➋ Slowly pour oil into the diff and watch the weight. Add 1.50g of oil
into the diff. The approximate weight of the diff including oil is 11.00g.
9.50g + 1.50g = 11.00g
g
9.50 g
1 1 .00
CUTAWAY VIEW
#304932
GRAPHITE GEAR DIFF BEVEL &
SATELLITE GEARS (2+4)

8
1. GEAR DIFFERENTIAL
1. GEAR DIFFERENTIAL
971240
O 24x0.7
941015
BB 10x15x4
903258
SFH M2.5x8
➊
➋
➌
➍
After disassembling the gear diff, the large O-ring may have an
increased size and may be more difficult to re-install. We recommend
either inserting the old O-ring carefully in the diff cover, or installing
a new O-ring if the old one cannot be made to fit properly.
OIL
Tighten the screws equally but do
NOT tighten them completely. Finish tightening in this order.
DETAIL
NOTE
ORIENTATION
BEARING OIL
(HUDY #106230) BEARING OIL
(HUDY #106230)
OIL

9
901408
901310
901308
303260
303250
303260
901408
303250
303260
901308
303260
903308
903308
301015
302181-M
302181-H (OPTION)
302180-M
302180-H (OPTION)
303180-M
303180-H (OPTION)
303181-M
303181-H (OPTION)
303119-K
303123-K (OPTION)
303119-K
303123-K (OPTION)
901310
2. FRONT & REAR SUSPENSION
BAG
02
302180-M X4 COMPOSITE CFF™ CARBON-FIBER FUSION FRONT LOWER ARM - MEDIUM - RIGHT
302181-M X4 COMPOSITE CFF™ CARBON-FIBER FUSION FRONT LOWER ARM - MEDIUM - LEFT
303119-K ALU SHIM 3x9x2.0MM - BLACK (10)
303180-M X4 COMPOSITE CFF™ CARBON-FIBER FUSION REAR LOWER ARM - MEDIUM - RIGHT
303181-M X4 COMPOSITE CFF™ CARBON-FIBER FUSION REAR LOWER ARM - MEDIUM - LEFT
303250 X4 LOWER ARM BALL UNIVERSAL 6.0MM WITH HEX - HUDY SPRING STEEL™ (2)
303260 X4 PIVOT BALL 6.0MM WITH M3x5.5MM THREAD - HUDY SPRING STEEL™ (2)
901308 HEX SCREW SB M3x8 (10)
901310 HEX SCREW SB M3x10 (10)
901408 HEX SCREW SB M4x8 (10)
903308 HEX SCREW SFH M3x8 (10)
301015 X4F GRAPHITE CHASSIS 2.2MM
FRONT LOWER ARMS
#302181-M LEFT MEDIUM INCLUDED
#302180-M RIGHT MEDIUM INCLUDED
#302181-H LEFT HARD OPTION
#302180-H RIGHT HARD OPTION
REAR LOWER ARMS
#303181-M LEFT MEDIUM INCLUDED
#303180-M RIGHT MEDIUM INCLUDED
#303181-H LEFT HARD OPTION
#303180-H RIGHT HARD OPTION
#302121
FRONT ROLL-CENTER SPACER (2)
#302122
REAR ROLL-CENTER SPACER (2)

10
LOWER ARMS
VIDEO TECH TIP
▶
901310
SB M3x10
901408
SB M4x8
SUSPENSION ARMS
SUSPENSION ARMS
SUSPENSION ARMS
Make sure to use 10mm set
screw for rear arms.
2. FRONT & REAR SUSPENSION
Make sure to note
overtighten this value.
LEFT = RIGHT
L=R
2.6mm
5.0mm
DETAIL
NOTE
ORIENTATION
NOTE
ORIENTATION
NOTE
ORIENTATION
NOTE
ORIENTATION
NOTE
ORIENTATION
NOTE
ORIENTATION
NOTE
ORIENTATION
NOTE
ORIENTATION
3x10mm
4x8mm
Install the pivot balls with Professional
Multi Tool (HUDY #183011).
Install the pivot balls with Professional
Multi Tool (HUDY #183011).
Press
straight
Press
straight

11
ROLL-CENTER
CHASSIS ALTERNATIVES
VIDEO TECH TIP
▶
303119-K
SHIM 3x9x2
903308
SFH M3x8
901308
SB M3x8
901408
SB M4x8
SUSPENSION ARMS
Make sure to use 8mm
set screw for front arms.
2. FRONT & REAR SUSPENSION
3x8mm
3x9x2mm
3x9x2mm
3x9x2mm
3x9x2mm
4x8mm
LEFT = RIGHT
L=R
3.0mm
3.0mm
DETAIL
Make sure to note
overtighten this value.
We recommend the MEDIUM hardness of the lower suspension arms for
asphalt. These arms are more flexible than the H (hard) arms.
For carpet racing and even some high-grip asphalt conditions, we
recommend the HARD suspension arms.
RAISING THE LOWER ARMS will raise the car’s roll center. Raising the lower
arms both front and rear will free up the car, and will make it initially
more responsive. Side bite will be decreased. A higher roll center is typically
recommended for asphalt racing.
LOWERING THE LOWER ARMS will lower the car’s roll center. Lowering both
the front and rear arms will lock in the car more, and will make it initially
less responsive. Side bite will be increased. A lower roll center is typically
recommended for carpet racing.
ROLL-CENTER ADJUSTMENT
#302121
FRONT ROLL-CENTER SPACER (2)
#302122
REAR ROLL-CENTER SPACER (2)
FRONT LOWER ARMS
#302181-M LEFT MEDIUM INCLUDED
#302180-M RIGHT MEDIUM INCLUDED
#302181-H LEFT HARD OPTION
#302180-H RIGHT HARD OPTION
REAR LOWER ARMS
#303181-M LEFT MEDIUM INCLUDED
#303180-M RIGHT MEDIUM INCLUDED
#303181-H LEFT HARD OPTION
#303180-H RIGHT HARD OPTION
NOTE ORIENTATION
Front Arms.
NOTE ORIENTATION
Rear Arms.

12
03
902306
302772
902314
903305
903305
903305
302062
902308
301570
302311
305437
305525
305531
302056
903305
301570
902308
301570
302970 362648
302773
304901
301970
302773
302772
301970
303125-K
303125-K
902306
302062
902303
902308
301570
302311
902308
930407
302311
902308
902308 302311
902308
305870
902314
962042
305578
970050
303757
903305
3. CENTRAL TRANSMISSION
BAG
301570 X4 ALU UPPER CLAMP - SWISS 7075 T6 (L+R)
301970 X4 ALU SHOCK TOWER FRONT - SWISS 7075 T6 (L+R)
302056 X4 GRAPHITE FRONT SUSPENSION BRACE
302062 COMPOSITE ADJUSTMENT BALL-BEARING HUB (4)
302311 X4 ALU CASTER BUSHING FRONT 4° / REAR 1.5° - 2 DOTS (4)
302772 X4 ALU LOWER BULKHEAD - FRONT R / REAR L - HD - 7075 T6
302773 X4 ALU LOWER BULKHEAD - FRONT L / REAR R - HD - 7075 T6
302970 X4 ALU SHOCK TOWER REAR - SWISS 7075 T6
303125-K ALU SHIM 3x6x3.0MM - BLACK (10)
303757 X4F ALU MOTOR MOUNT
305437 HIGH-PERFORMANCE DRIVE BELT 3x300MM
305525 X4F ALU SOLID LAYSHAFT & BEARINGS
305531 X4F ALU SOLID LAYSHAFT WASHER FOR BATTERY BACKSTOP
305578 FIXED PULLEY FOR LAYSHAFT WITH BEARINGS 20T (2)
305870 OFFSET SPUR GEAR 100T / 64
362648 BALL END 4.9MM WITH THREAD 4MM (2)
902303 HEX SCREW SH M3x4 SMALL HEAD - STAINLESS (10)
902306 HEX SCREW SH M3x6 (10)
902308 HEX SCREW SH M3x8 (10)
902314 HEX SCREW SH M3x14 (10)
903305 HEX SCREW SFH M3x5 (10)
903306 HEX SCREW SFH M3x6 (10)
930407 BALL-BEARING 4x7x2.5 STEEL SEALED - OIL (2)
962042 WASHER S 4x6x0.1 (10)
970050 O-RING 5x1 (10)
304901 X4 GEAR DIFFERENTIAL - SET
SPUR GEARS 48P
#305772 72T / 48P OPTION
#305776 76T / 48P OPTION
#305778 78T / 48P OPTION
#305779 79T / 48P OPTION
#305781 81T / 48P OPTION
#305784 84T / 48P OPTION
#305784-O 84T / 48P OPTION
OFFSET SPUR GEARS 64P
#305860 90T / 64P OPTION
#305862 92T / 64P OPTION
#305866 96T / 64P OPTION
#305866-O 96T / 64P OPTION
#305869 99T / 64P OPTION
#305870 100T / 64P INCLUDED
#305870-O 100T / 64P OPTION
#305874 104T / 64P OPTION
#305876 106T / 64P OPTION
#305878 108T / 64P OPTION
#305880 110T / 64P OPTION
#305880-O 110T / 64P OPTION
#305882 112T / 64P OPTION
#305884 114T / 64P OPTION
#302063-K
ALU ADJUSTMENT BALL-BEARING HUB (2)
903306
#303768
ALU CHASSIS T-BRACE - 7075 T6
#303767
BRASS CHASSIS T- BRACE - 10g
ALU CASTER BUSHINGS
#302310 FRONT 3° / REAR 5.5° or 0.5° 1 Dot OPTION
#302311 FRONT 4° / REAR 4.5° or 1.5° 2 Dots INCLUDED
#302312 FRONT 5° / REAR 3.5° or 2.5° 3 Dots OPTION
#305578-O
FIXED PULLEY FOR LAYSHAFT WITH
BEARINGS 20T - GRAPHITE (2)
#302055
X4 ALU CHASSIS FRONT BRACE
For more information see page 46 / STEP 2

13
BUILDING THE
BULKHEADS
VIDEO TECH TIP
▶
903305
SFH M3x5
3. CENTRAL TRANSMISSION
#302063-K
ALU ADJUSTMENT BALL-BEARING HUB (2)
DETAIL
NOTE
ORIENTATION
Milled Out Area inside
GEAR DIFF
GEAR DIFF
SHORTLONG
DETAIL
DETAIL
NOTE
ORIENTATION
Milled Out Area inside

14
CASTER
VIDEO TECH TIP
▶
902308
SH M3x8
902308
SH M3x8
3. CENTRAL TRANSMISSION
NOTE ORIENTATION FOR ALL PARTS
Never use alu or titanium screws
for the eccentric bushings.
Never use alu or titanium screws
for the eccentric bushings.
1 Dot = 5.5º Caster
3 Dots = 3.5º Caster
2 Dots = 4.5º Caster
1 Dot = 0.5º Caster
CASTER CASTER
1 Dot = 3.0º Caster
3 Dots = 2.5º Caster 3 Dots = 5.0º Caster
2 Dots = 1.5º Caster (INITIAL SETTING) (INITIAL SETTING)
2 Dots = 4.0º Caster
CASTER ADJUSTMENT
FRONT CASTER
For most conditions, a good starting
point for front caster set is 4.0°
Increasing front caster will increase
steering (mainly on-power), but it
will also make the car more difficult to
drive and more likely to traction roll.
REAR CASTER
A good starting point for rear caster
is 4.5°
More rear caster will increase traction
and steering. Less rear caster will
increase rotation of the car.
IMPORTANT
All 4 bushings at one end of the car must
be installed in the same orientation.
IMPORTANT
All 4 bushings at one end of the car must
be installed in the same orientation.
ALU CASTER BUSHINGS
#302310 FRONT 3° / REAR 5.5° or 0.5° 1 Dot OPTION
#302311 FRONT 4° / REAR 4.5° or 1.5° 2 Dots INCLUDED
#302312 FRONT 5° / REAR 3.5° or 2.5° 3 Dots OPTION

15
902303
SH M3x4
970050
O 5x1
966081
CH-CLIP 8
930407
BB 4x7x2.5
ALTERNATIVE
64P OFFSET SPUR GEAR
ALTERNATIVE
48P SPUR GEAR
(INITIAL SETTING)
OIL
OIL
BEARING OIL
(HUDY #106230)
TO TIGHTEN REAR BELT: Rotate both front nylon hubs in arrow direction B
FRONT BELT TENSION ADJUSTMENT
L=R
TO LOOSEN REAR BELT: Rotate both front nylon hubs in arrow direction A
Front diff LOWER position - tab in top notch - provides
more front traction, but makes the car push on-power.
Recommended for low-traction tracks.
Front diff UPPER position - tab in bottom notch - provides
more steering, but less front traction
Recommended for medium-high traction
tracks and technical tracks.
BA
LOWER DIFF POSITION
A
B
UPPER DIFF POSITION
INITIAL POSITION FOR CARPET/ASPHALT
Place tab in this BOTTOM NOTCH
3. CENTRAL TRANSMISSION
1. 2. 2. 3.
OFFSET NOTE
ORIENTATION
CUTAWAY VIEW
DETAIL
NOTE
ORIENTATION
1mm
Snap Ring Pliers
(HUDY #189040)
#966081
CH-CLIP 8 (10)
INCLUDED IN THE
LAST AID BAG
Another alternative to secure
the pulley on the layshaft is
to use the CH-clip which is
included in the “Last Aid”
Bag. To mount the clip on
the layshaft, you have to use
special Snap Ring Pliers.
NOTE
ORIENTATION
SPUR GEARS 48P
#305772 72T OPTION
#305776 76T OPTION
#305778 78T OPTION
#305779 79T OPTION
#305781 81T OPTION
#305784 84T OPTION
#305784-O 84T OPTION
OFFSET SPUR GEARS 64P
#305860 90T OPTION
#305862 92T OPTION
#305866 96T OPTION
#305866-O 96T OPTION
#305869 99T OPTION
#305870 100T INCLUDED
#305870-O 100T OPTION
#305874 104T OPTION
#305876 106T OPTION
#305878 108T OPTION
#305880 110T OPTION
#305880-O 110T OPTION
#305882 112T OPTION
#305884 114T OPTION
DIFF HEIGHT BELT TENSION
ADJUSTMENT
VIDEO TECH TIP
▶
When using XRAY 48P spur gears or
aftermarket spur gears without an offset, use
the 3x5x1mm shims (#303141 not included)
between the gear and layshaft to create the
necessary clearance from the top deck.
#305578-O
FIXED PULLEY FOR
LAYSHAFT WITH
BEARINGS 20T
GRAPHITE (2)

16
BELT TENSION
ADJUSTMENT
VIDEO TECH TIP
▶
903306
SFH M3x6
903305
SFH M3x5
962042
S 4x6x0.1
0.1mm
3. CENTRAL TRANSMISSION
NOTE
ORIENTATION

17
CHASSIS & TOP DECKS
VIDEO TECH TIP
▶
903306
SFH M3x6
903305
SFH M3x5
303121-K
SHIM 3x6x0.5
The brace provides chassis flex adjustment possibilities depending on which screws are connected.
CHASSIS FLEX ADJUSTMENT
NOTE ORIENTATION
DETAIL
0.5mm
SHIM
0.5mm
SHIM
CHANNEL
3x5mm
3x5mm
3x6mm
3x6mm
Use only for STIFF setting
0.5mm
0.5mm
Use only for STIFF
setting
3. CENTRAL TRANSMISSION
Install the brace using only the 2 forward
bottom centerline screws (as shown). (as
shown). This gives improved on-power
stability but still offers great off-power
steering and rotation. Recommended for
medium-high traction conditions and for
small, technical tracks with many hairpin
corners.
When the brace is not installed, the car
will have the most steering and rotation.
However, the car will be more difficult to
drive as it is less stable. Recommended
for medium-high traction conditions and
for small, technical tracks with many
hairpin corners.
Install the brace using all 3 bottom
centerline screws (as shown). This gives
improved on-power stability and traction,
but makes the car push more off-power.
Recommended for low- or high-traction
conditions where stability and traction is
needed.
In addition to installing all 3 bottom
centerline screws, also install the 2
rear side screws but with 0.5mm shims
between the brace and the chassis. This
setting gives maximum stability.
SOFT - MEDIUMSOFT - NO BRACE MEDIUM STIFF
#303768
ALU CHASSIS T-BRACE - 7075 T6
#303767
BRASS CHASSIS T-BRACE - 10g

18
902314
SH M3x14
903305
SFH M3x5
902306
SH M3x6
303125-K
SHIM 3x6x3
902306
SH M3x6
Do not tighten the screw fully at first.
Only tighten the screws fully after the
shock tower is mounted with all screws.
Do not tighten fully.
Tighten fully after assembly.
Do not tighten fully.
Do not use for
initial setting
3mm
IMPORTANT
3. CENTRAL TRANSMISSION
This graphite brace reduces flex in the front of the car. The
brace will increase initial steering response but will reduce
grip from mid corner to exit. The brace is recommended for
any conditions that benefit from aggressive initial response
and is more precise to drive. The brace also increases stability
on bumpy tracks.
The initial setting is to run without this brace.
FRONT BULKHEADS GRAPHITE BRACE

19
#302590
ALU DUAL SERVO SAVER SCREW M3x7 (2)
#302571
X4 GRAPHITE STEERING PLATE SET
#303117-K
ALU SHIM 3x12x2.0mm (2)
#301075
GRAPHITE UPPER DECK - SPLIT FRONT - 2.0mm
#301076
GRAPHITE UPPER DECK - SPLIT REAR - 2.0mm
4. STEERING
BAG
04
301074 X4F GRAPHITE UPPER DECK 2.0MM
301158 TOP DECK HEX SCREW M3x5.5 - HUDY SPRING STEEL™ (2)
302517-K X4 ALU DUAL STEERING ARM - BLACK + BALL-BEARINGS (2)
302539 X4 ALU STEERING POST FOR DUAL SERVO SAVER (2)
302544 ALU SHIM FOR RADIAL PLAY ADJUSTMENT OF STEERING ARM (2)
302552 ALU STEERING PLATE 8.0MM FOR DUAL SERVO SAVER
302663 COMPOSITE BALL JOINT 5 MM - OPEN - V2 (8)
303116-K ALU SHIM 3x10x2.0MM - BLACK (2)
303122-K ALU SHIM 3x6x1.0MM - BLACK (10)
303210 REAR TURNBUCKLE L/R 26 MM - HUDY SPRING STEEL (2)
303454 BALL JOINT 4.9MM - OPEN (4)
306219 COMPOSITE SET OF SERVO SHIMS (4)
352610 ADJ. TURNBUCKLE M3 L/R 45 MM - SPRING STEEL - V3 (2)
362648 BALL END 4.9MM WITH THREAD 4MM (2)
362652 BALL END 4.9MM WITH THREAD 10MM (2)
372503 COMPOSITE SERVO SAVER - X-STIFF - SET - V2
372649 BALL END 4.2MM WITH 4MM THREAD (2)
372653 BALL END 4.2MM WITH 8MM THREAD (2)
372661 COMPOSITE STEERING BALL-JOINT OPEN 4.2 MM (4)
902303 HEX SCREW SH M3x4 SMALL HEAD - STAINLESS (10)
902305 HEX SCREW SH M3x5 (10)
902306 HEX SCREW SH M3x6 (10)
903305 HEX SCREW SFH M3x5 (10)
940508 BALL-BEARING 5x8x2.5 RUBBER-SEALED - OILED (2)
352610
372661
372661
352610
372661
903305
302539
302517-K
372503
372503
303454
372503
306219
362652
902305
302544
372661
303210
372653
372653
362648
940508
940508
301074
902305
372649
902306
303122-K
302552
302663
902305
902303
303116-K
301158

20
STEERING SYSTEM
VIDEO TECH TIP
▶
940508
BB 5x8x2.5
2x
L=R
902306
SH M3x6
902303
SH M3x4
303116-K
SHIM 3x10x2
303122-K
SHIM 3x6x1
approx. 14.5mm
NOTE ORIENTATION
(outside)
3x6x1mm
(Do not use for initial setting)
NOTE ORIENTATION
(outside)
4mm THREAD
4.2mm BALL
STEERING LINKS SERVO LINK
Adjust servo link to fit your servo.
29.8mm
2x
2x
L=R
THREAD
THREAD
Install the pivot balls with Professional
Multi Tool (HUDY #183011).
8mm THREAD
4.2mm BALL
8mm THREAD
4.2mm BALL
THREAD
THREAD
NOTE ORIENTATION
Round ball joint on the long side.
NOTE
ORIENTATION
NOTE
ORIENTATION
BEARING OIL
(HUDY #106230)
BEARING OIL
(HUDY #106230)
3x10x2mm
3x6mm
3x6mm
3x4mm
OIL
OIL
OIL
5x8x2.5mm
5x8x2.5mm
OIL
#303117-K
ALU SHIM 3x12x2.0mm (2)
STEERING LOCK ADJUSTMENT
Steering lock angle is adjusted by the size of the shim
which attaches to the bottom of the steering.
The kit includes a 10mm OD shim, which limits the
physical steering lock to approx. 26°.
An optional 12mm shim is available, which will limit
the physical steering lock to approx. 23°.
More steering lock will increase steering - especially in
tight corners - but also reduces cornering speeds and
makes the car more difficult to drive.
4. STEERING