Duratrax 835B User manual

115 Differential Case O-Ring...............................DTXC7514
116 Differential Shaft O-Ring...........DTXC7514, DTXC9329,
DTXC7513
117 Differential Output Joint (Front/Rear)............DTXC7515
118 Center Differential Output Joint ....................DTXC7516
119 Differential Cross Pin Shaft...........................DTXC7517
120 Differential Output Joint Pin (2.5x13mm)......DTXC7517
121 Differential Large Bevel Gear........................DTXC7518
122 Differential Small Bevel Gear........................DTXC7518
123 Rear Axle .....................................................DTXC8456
124 King Pin Bushing ..........................................DTXC8093
125 Upper Shock Mount......................................DTXC8948
126 Upper Shock Mount Bushing........................DTXC8945
127 Front Shock Body .....................DTXC8947, DTXC8982
128 Rear Shock Body......................DTXC8947, DTXC8983
129 Shock Cap ............ DTXC8947, DTXC8982, DTXC8983
130 Upper Spring Mount .................DTXC8947, DTXC8982,
DTXC8983
131 Upper Spring Mount O-Ring .....DTXC8947, DTXC8982,
DTXC8983
132 Lower Spring Mount..................DTXC8945, DTXC8982,
DTXC8983
133 Front Shock End .......................DTXC8945, DTXC8982
134 Front Shock Spring ...................DTXC8946, DTXC8982
135 Shock Diaphragm .....................DTXC8945, DTXC8982,
DTXC8983
136 Shock Piston......... DTXC8945, DTXC8982, DTXC8983
137 Front Shock Shaft .....................DTXC8945, DTXC8982
138 Rear Shock Shaft......................DTXC8945, DTXC8983
139 Shock O-Ring ....... DTXC8945, DTXC8982, DTXC8983
140 Shock O-Ring Spacer (Thin).....DTXC8945, DTXC8982,
DTXC8983
141 Shock Seal Retainer.................DTXC8947, DTXC8982,
DTXC8983
142 Front Shock Boot ......................DTXC8944, DTXC8982
143 Rear Shock Boot.......................DTXC8944, DTXC8983
144 Rear Shock Spring....................DTXC8946, DTXC8983
145 Rear Shock End........................DTXC8945, DTXC8983
146 Front Sway Bar .............................................DTXC9607
147 Rear Sway Bar..............................................DTXC9608
148 Sway Bar Retainer....................DTXC9607, DTXC9608,
DTXC6831
149 Sway Bar End Pivot ..................DTXC9607, DTXC9608
150 Sway Bar Ball End ....................DTXC9607, DTXC9608
151 Rear Hub Spacer......................................... DTXC8094
152 3x40mm Screw Pin....................................... DTXC8601
153 3x45mm Screw Pin....................................... DTXC8601
155 4x37mm Screw Pin................... DTXC8601, DTXC6831
156 4x62mm Screw Pin................... DTXC8601, DTXC6831
157 4x70mm Screw Pin....................................... DTXC8601
158 3mm Ball...................................DTXC9462, DTXC8945
159 3mm Stand-Off Ball ......................................DTXC9634
160 Ball Nut .....................................DTXC6191, DTXC9339
161 Wheel............................................................DTXC9795
162 Tire................................................................DTXC9795
163 Foam Tire Insert ...........................................DTXC9795
164 Antenna Tube................................................ DTXC6161
165 6V 5-cell 1300mAh NiMH Rx Battery ......... DTXM2040
166 Fuel Line Clip................................................DTXC6952
167 Linkage Slider B............................................DTXC8806
168 3x8mm Ball (Tall) ......................DTXC6191, DTXC9340
169 3x8mm Ball (Short)...................DTXC6191, DTXC9339
170 Shock O-Ring Spacer (Thick) ...DTXC8945, DTXC8982,
DTXC8983
171 Shock Shaft Guide....................DTXC8945, DTXC8982,
DTXC8983
172 4x8mm O-Ring..............................................DTXC9289
173 Throttle Return Spring ..................................DTXC9966
HARDWARE
A5x10mm Ball Bearing ...................................DTXC1535
B8x16mm Ball Bearing ...................................DTXC1585
C6x10 Bushing................................................ DTXC6781
D3x8mm Button Head Hex Screw................... TKPQ0201
E3x10mm Button Head Hex Screw.................TKPQ0202
F3x12mm Button Head Hex Screw................ DTXQ5060
G3x15mm B/H Shoulder Brake Screw ............DTXC8651
H3x16mm Button Head Hex Screw.................TKPQ0205
J3x18mm Button Head Hex Screw.................TKPQ0206
K3x22mm Button Head Hex Screw.................DTXC8652
L4x12mm Button Head Hex Screw.................TKPQ0222
M4x20mm Button Head Hex Screw.................DTXC8657
N3x8mm Button Head Screw..........................DTXC4390
P2.6x6mm Self-Tapping Screw...................... DTXQ0203
Q3x10mm Flat Head Hex Screw .....................TKPQ0102
R3x12mm Flat Head Hex Screw .....................TKPQ0103
T4x12mm Flat Head Hex Screw .....................TKPQ0122
U4x14mm Flat Head Hex Screw .....................TKPQ0123
V3x10mm Cap Screw .................................... DTXQ0285
W3x12mm Cap Screw .................................... DTXQ0285
X3x20mm Socket Head Screw....................... DTXQ0286
Y3x30mm Socket Head Screw........................DTXQ0287
Z3x3mm Set Screw.........................................DTXC8660
AA 3x10mm Set Screw.......................................DTXC8661
BB 4x5mm Set Screw........................................ DTXQ0305
CC 4x12mm Set Screw...................................... DTXQ0305
DD 3x8mm Washer.............................................DTXC9763
EE 4x7mm Washer.............................................DTXC8697
FF 6x13x0.1mm Shim........................................DTXC8698
GG 3mm Lock Washer ........................................DTXC9764
HH 3mm Locknut ................................................DTXC8240
JJ 4mm Locknut ................................................TKPQ1004
KK Body Clip (Large)..........................................DTXC6472
LL Body Clip (Small)..........................................DTXC6442
MM 4x10mm Motor Mount Screws......................DTXC8699
NN 5x4mm Set Screws.......................................DTXQ0307
PP 6x13x0.5mm Shim........................................DTXC8698
QQ Clutch Bell Washer (5x8x0.3mm) .................DTXC8696
DTXD72Mnl
© 2012 Hobbico, Inc. All rights reserved.
®

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138 Rear
127 Front
128 Rear
142 Front
143 Rear
134 Front
144 Rear
133 Front
145 Rear
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RR
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FF
FF
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PP BB
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L
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DD
BB
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NN
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DD
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MFFF
HH
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D
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DD
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DK
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AA
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VF
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ZHH
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AQQ
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TJJ
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FR
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DD
FF
F
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JJ
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JJ
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E
EE
EE
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EE
FF
TABLE OF CONTENTS
CONTENTS
REQUIRES
Chassis
Antenna
Tube
Rx Battery
Charger
Receiver
Battery
Glow
Starter
Fuel
Bottle
Duratrax T240F 2.4 GHz Transmitter
“C” Alkaline
Battery
(Glow Starter)
“AA” Alkaline
Batteries x4
(Transmitter)
Air Filter Oil
(DTXC2465)
Fuel
(ODOP4520)
Engine Stop Tool
E
i
S
t
T
l
™
2
2
SAFETY PRECAUTIONS AND WARRANTY...............3 TUNING GUIDE ........................................................8
PREPARE TO RUN THE 835B...................................4 ASSEMBLY GUIDE .................................................11
ENGINE RUNNING & MAINTENANCE ......................6 REPLACEMENT PARTS..........................................39

3
3
SPECIFICATIONS & DESCRIPTION CHANGES
All information found in this manual is subject to change without notice. Visit Duratrax.com for the latest updates and information on your
model. Duratrax maintains no responsibility for inadvertent errors in this manual.
SAFETY PRECAUTIONS
To prevent injury and damage to property, follow these safety precautions
when operating any radio control vehicle.
Keep all spectators a safe distance away from the vehicle.
ALWAYS turn the transmitter on before the receiver.
NEVER touch any part of the engine or exhaust as they can become very hot.
ALWAYS keep model engine fuel out of the reach of children and follow
precautions on the container.
NEVER run your model indoors. Fuel powered vehicles create harmful fumes.
NEVER smoke and avoid ignition sources when using model engine fuel.
Model engine fuel is poisonous and flammable. Keep away from open flame.
Use a mat or towel when working on your model to protect your work surface.
Do NOT run your radio control vehicle in cold weather as plastic parts
may become brittle.
WARNING: This product contains a chemical known to the State of California to
cause cancer.
LIMITED WARRANTY
Duratrax guarantees this kit to be free from defects in
materials or workmanship for 90 days (3 years for the
engine) after the date of purchase. Duratrax will repair
or replace at no charge any incorrectly made part.
Your receipt or invoice at time of purchase is your
proof of purchase and is required for Duratrax to
honor any warranty. Duratrax reserves the right to
change or modify this warranty without notice.
For warranty repairs, contact or send to:
Hobby Services
3002 N. Apollo Drive Suite 1
Champaign, IL 61822
ATTN: Service Department
Phone: [phone]
9:00 am – 5:00 pm Central Time M-F
E-mail: [email protected]
www.hobbyservices.com
IF the buyer is not prepared to accept the liability
associated with the use of this product, buyer
is advised to return kit immediately in new and
unused condition to the place of purchase.
STRESS-TECH PARTS GUARANTEE
Stress-Tech parts are guaranteed for 12 months from the date of purchase.
Check the parts list for items covered under the Stress-Tech guarantee.
Should a Stress-Tech part break during the first 12 months after purchase,
return the part to Hobby Services and we will send you a FREE replacement.
To receive your FREE replacement Stress-Tech part, include the following and
return to Hobby Services at the address above:
1. Broken part
2. Part number and description of the broken part
3. COPY of your dated purchase invoice or receipt
4. Name, phone number and shipping address
TM
REPAIR SERVICE
Hobby Services offers repair services after the 90 day limited warranty or 12
month Stress-Tech parts replacement for a minimal charge.
Follow these instructions for your repair request:
1. Most circumstances require the return of the ENTIRE vehicle. STRESS-TECH
requires ONLY the broken part to be returned following the instructions above.
2. Turn off the transmitter and remove the batteries.
3. Empty fuel tank on nitro vehicles.
4. Include written instructions listing ALL items being returned with a
THOROUGH description of the problem, service needed and your DAYTIME
phone number. IF you expect the repair to be covered under the 90 day
limited warranty, include copy of receipt or invoice with date of purchase.
5. Send to Hobby Services at the address above. When shipping your item(s)
to us, we recommend that you insure them and use a company that offers
tracking service (such as UPS or Federal Express).
We will carefully inspect your item and notify you of our findings. You will be
advised of your options for return, repair, or replacement. Please note that
items sent back unrepaired will carry a return shipping and service charge.
Hobby Services accepts Visa®, MasterCard®, or you can send a check. We can
return the item C.O.D., but additional charges will apply.
NiMH
082E
Included radio system is not fully compliant with French regulations.

4
4
1
1
2
2
s
Apply air filter oil (DTXC2465) onto the foam element, squeezing
the element until it is completely coated with the oil.
s
TIP! Placing the element in a plastic bag will help keep your hands clean.
s
Remove any excess oil with a paper towel.
4
4
3
3
+
–
NR
ST
NR
TH
BIND
ST-D/RTH-TRIMST-TRIM
Throttle
Reversing
Switch
Steering
Reversing
Switch
Steering
Trim Throttle
Trim
Steering
Dual Rate
Forward
Reverse
For
war
d
R
6
6
5
5
4
4
CHARGE THE RECEIVER
BATTERY
INSTALL ANTENNA TUBE
AND RECEIVER BATTERY
INSTALL GLOW STARTER
BATTERIES
INSTALL TRANSMITTER
BATTERIES
CHECK TRANSMITTER
OIL AIR FILTER
Allow 8 hours to fully
charge the battery.
Remove the battery.
Install (4) AA batteries.
Note: ALWAYS turn on your transmitter
then your receiver. When finished ALWAYS
turn off your receiver then your transmitter.

5
5
12 STOP THE ENGINE
7
7
8
8
5
5
FUEL THE CAR START THE ENGINE
10
10
9
9STOP THE ENGINE FAILSAFE
NR
ST NR
TH
BIND
ST-D/RTH-TRIMST-TRIM
11
11 RE-BIND THE TRANSMITTER TO THE RECEIVER
See page 6 for starting
and engine break-in.
To stop your 835b engine,
place the pointed end of
the engine tool into the
exhaust outlet (stinger).
This will block the exhaust
and stop the engine.
Your radio system is
preset at the factory.
If you need to re-bind
your system, follow
these steps.
1. Insert bind plug into
receiver channel 3.
2. Move the radio
box switch to the
“ON” position.
The LED should
start blinking.
4. Move the radio box switch to the “OFF”
position and turn off the transmitter.
Remove the bind plug from the receiver.
3. Hold down the
transmitter’s “bind”
button and turn on
the transmitter. The
receiver LED will
stop blinking
To set:
1. Power up the transmitter and receiver.
2. Hold the buggy so the wheels are off the ground and clear
of all objects.
3. With the transmitter throttle in neutral, press the failsafe set
button on the receiver. The receiver LED will flash to indicate
a new failsafe point
has been set.
The R240FS receiver has a build in failsafe. If the
receiver loses contact with the transmitter, it will
automatically return the throttle to a preset point.
Failsafe Set
Button

6
6
BREAK-IN PROCEDURE
When starting, hold the throttle slightly open. If the engine is difficult to turn over, loosen glow plug 1/2-turn before starting engine (this allows
When starting, hold the throttle slightly open. If the engine is difficult to turn over, loosen glow plug 1/2-turn before starting engine (this allows
some compression to escape while allowing the engine to start). Once engine starts, tighten the glow plug.
some compression to escape while allowing the engine to start). Once engine starts, tighten the glow plug.
IMPORTANT! FLOODED ENGINE:
IMPORTANT! FLOODED ENGINE:
If you are still having problems turning the engine over, it is flooded (too much fuel inside the engine).
If you are still having problems turning the engine over, it is flooded (too much fuel inside the engine).
1. Remove glow plug and turn vehicle upside down, pointing away from you.
1. Remove glow plug and turn vehicle upside down, pointing away from you.
2. Pull the recoil 5 times (clearing engine of fuel).
2. Pull the recoil 5 times (clearing engine of fuel).
3. Replace glow plug.
3. Replace glow plug.
4. Repeat starting engine steps.
4. Repeat starting engine steps.
Engine break in will be accomplished with the first 5 tanks of fuel.
Engine break in will be accomplished with the first 5 tanks of fuel.
1. During break-in, run with the body off to keep the engine cool.
1. During break-in, run with the body off to keep the engine cool.
2. Keep air filter on at all times.
2. Keep air filter on at all times.
3. Run on smooth, hard surface.
3. Run on smooth, hard surface.
4. Make sure you have extra glow plugs. Break-in puts stress on the glow plug and it may
4. Make sure you have extra glow plugs. Break-in puts stress on the glow plug and it may
need to be replaced.
need to be replaced.
TANK 1
TANK 1
Run very rich allowing fuel to carry as much oil as possible to lubricate internal engine parts.
Run very rich allowing fuel to carry as much oil as possible to lubricate internal engine parts.
1. High Speed Needle Valve: Check this setting before running. Close the high speed
1. High Speed Needle Valve: Check this setting before running. Close the high speed
needle by rotating it clockwise until you just feel resistance, then open to 4 full turns out
needle by rotating it clockwise until you just feel resistance, then open to 4 full turns out
(counterclockwise).
(counterclockwise).
2. Run at medium speeds, slowly accelerating and decelerating.
2. Run at medium speeds, slowly accelerating and decelerating.
3. If engine does not stay running consistently, increase idle speed by turning the idle stop screw clockwise.
3. If engine does not stay running consistently, increase idle speed by turning the idle stop screw clockwise.
4. DO NOT allow the tank to run out of fuel during break-in.
4. DO NOT allow the tank to run out of fuel during break-in.
5. Stop engine and allow it to cool approximately 10 – 15 minutes.
5. Stop engine and allow it to cool approximately 10 – 15 minutes.
TANKS 2-4
TANKS 2-4
1. For each additional tank, lean high speed needle 1/12 turn from the previous tank’s setting.
1. For each additional tank, lean high speed needle 1/12 turn from the previous tank’s setting.
2.
2.
Stop engine, allowing it to cool approximately 10 – 15 minutes, between each tank.
Stop engine, allowing it to cool approximately 10 – 15 minutes, between each tank.
TANK 5
TANK 5
1. Lean high speed needle an additional 1/12 turn from Tank 4 setting.
1. Lean high speed needle an additional 1/12 turn from Tank 4 setting.
2. The engine should now be very close to final tune and be broken in and ready to be performance tuned.
2. The engine should now be very close to final tune and be broken in and ready to be performance tuned.
TUNING TIPS (Adjust only after the engine is fully broken in.)
TUNING TIPS (Adjust only after the engine is fully broken in.)
IMPORTANT!
IMPORTANT!
Always run the engine for 1-2 minutes to warm up temperature before tuning! Only use “small” adjustments (1/12 turn at a time) and
Always run the engine for 1-2 minutes to warm up temperature before tuning! Only use “small” adjustments (1/12 turn at a time) and
test the results.
test the results.
High Speed Needle:
High Speed Needle:
Controls the fuel/air mixture at high throttle settings. A properly tuned engine will accelerate smoothly and exhaust a
Controls the fuel/air mixture at high throttle settings. A properly tuned engine will accelerate smoothly and exhaust a
small amount of smoke. The goal is to tune the engine to make good power without overheating. Engine temperature should stay around 250°
small amount of smoke. The goal is to tune the engine to make good power without overheating. Engine temperature should stay around 250°
F (132° C) using a temperature gauge (Duratrax Flashpoint
F (132° C) using a temperature gauge (Duratrax Flashpoint
™, DTXP3100).
, DTXP3100).
Note:
Note:
This temperature is a “guideline” only. Your engine may run
This temperature is a “guideline” only. Your engine may run
slightly warmer or cooler depending on conditions: fuel, track, and how you drive.
slightly warmer or cooler depending on conditions: fuel, track, and how you drive.
Low Speed Needle:
Low Speed Needle:
Controls fuel mixture at low throttle settings (idle). To check this setting, keep the throttle at idle and pinch the fuel line
Controls fuel mixture at low throttle settings (idle). To check this setting, keep the throttle at idle and pinch the fuel line
close to the carburetor. A correct setting will increase the engine speed after 2-3 seconds and then lose speed.
close to the carburetor. A correct setting will increase the engine speed after 2-3 seconds and then lose speed.
• If it slows too quickly, the mixture is too lean. Open the low speed needle (counterclockwise).
• If it slows too quickly, the mixture is too lean. Open the low speed needle (counterclockwise).
• If it takes longer than 4 seconds to slow down, the mixture is too rich. Close the low speed needle (clockwise).
• If it takes longer than 4 seconds to slow down, the mixture is too rich. Close the low speed needle (clockwise).
Idle Stop Screw:
Idle Stop Screw:
Adjust this screw to set the idle speed so the wheels do not rotate when you lift the vehicle off of the ground. When looking
Adjust this screw to set the idle speed so the wheels do not rotate when you lift the vehicle off of the ground. When looking
into the carburetor, the barrel should be about 1mm from fully closed.
into the carburetor, the barrel should be about 1mm from fully closed.
CARE AND MAINTENANCE
CARE AND MAINTENANCE
1. Keep engine clean and free of dirt.
1. Keep engine clean and free of dirt.
2. Do not over lean engine.
2. Do not over lean engine.
3. Run all of the fuel out of the engine before storing.
3. Run all of the fuel out of the engine before storing.
4.
4.
Use after run oil and work it into the engine by turning the flywheel before storing
Use after run oil and work it into the engine by turning the flywheel before storing
.
5. Do not use a fuel with a nitromethane content over 30%.
5. Do not use a fuel with a nitromethane content over 30%.
~1mm
HIGH SPEED
NEEDLE
IDLE STOP
SCREW
LOW SPEED
NEEDLE
6
6

7
7
Engine Tools & Accessories
Engine Tuning Screwdriver
TrakPower™Speed Wash
Nitro Cleaner
Kwik-Pit™Fuel Bottles
Rapid Heat™Glo-Starter
FlashPoint™Infrared
Temperature Gauge
Deluxe Car Wrenches
O’Donnell Racing Fuel®
Air Filter Oil
Standard slot-head screwdriver has a 120 mm
hardened steel shaft with 3.2 mm wide magnetized
tip and rubberized, hexagonal handle.
DTXR0185
Applies with or without water and is safe
for titanium, aluminum, fiberglass, clear
coat, stainless steel, chrome, rubber,
plastic, vinyl and leather. 32 fl oz (946 mL).
TKPC8001
A squeeze on the clear plastic body
lets you control fuel flow. The 5 in
(63.5 mm) long aluminum spout
features a curved tip for no-spill refills
and a tip cap to prevent leaks. For
glow fuel only.
DTXP0125 250 cc (8.5 fl oz) Fuel Bottle
DTXP0150 500 cc (17.0 fl oz) Fuel Bottle
Twist-on for a secure connection
to heat your glow plug. Twist
the other way for easy removal.
Includes NiCd and AC charger.
DTXP3000
Just point and press for
fast, accurate, no-touch
temperature readings of
engines, motors, batteries
and more. Works in seconds
and turns off automatically
after 15 seconds of inactivity.
DTXP3100
Hand-assembled with heat resistant coils.
Carbon Speed is medium-hot for informal
racing and sport use. Gold Racing Plug is for
higher nitro fuels and competitive driving.
DTXG3003 Carbon Speed Plug
DTXG3005 Gold Racing Plug
Deluxe includes 6
socket head sizes
and stores up to 4
glow plugs. Ultimate
adds a slotted/Phillips
screwdriver bit and
19 mm socket for 1/8 car
wheel nuts.
DTXR1170 Deluxe Car Wrench
DTXR1175 Ultimate Car Wrench
Speed Blend improves fuel
economy and pushes engine
performance to the absolute
peak. Race Blend simplifies
tuning and reduces engine heat
and internal wear.
ODOP3320 20% Racing Fuel Quart
ODOP3325 25% Racing Fuel Quart
ODOP3330 30% Racing Fuel Quart
ODOP4520 20% Speed Blend Quart
ODOP4525 25% Speed Blend Quart
ODOP4530 30% Speed Blend Quart
Treats foam air filter elements
to increase filtering capacity
and extend engine life. Handy
1.75 fl oz (51.7 mL) bottle fits
easily into a tool box or tote.
DTXC2465
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Glow Plugs

8
8
TUNING GUIDE
As a starting point, make sure your car has equal lengths on shocks, camber links and steering rods on both
As a starting point, make sure your car has equal lengths on shocks, camber links and steering rods on both
sides (left and right). Front and rear do not need to be equal.
sides (left and right). Front and rear do not need to be equal.
ACKERMAN
The difference in turning angle between the inside wheel and outside wheel in a turn.
Rear Hole:
Rear Hole: Less initial steering into a corner. Smoother steering
response. Better for large flowing tracks.
Forward Hole:
Forward Hole: More initial steering into corner. Steering is
more aggressive. Better for tight technical tracks.
CAMBER
Angle of the tire and wheel in relation to the ground when
viewed from the front.
Negative Camber
Negative Camber = Top of the tire and wheel lean inward (Typically 0° to -2°)
• Improved traction while corning.
• Adds overall stability.
Positive Camber
Positive Camber = Tire and wheel lean outward (NOT recommended).
FRONT TOE-IN AND TOE-OUT
Direction the wheels point in relationship with each other,
when viewed from the front.
Toe-Out:
Toe-Out: Fronts of the wheels point away from each other.
• Decreased stability when accelerating and increased steering
when entering a corner.
Toe-In:
Toe-In: Front of the
wheels point toward each
other. (Typically 0 to -2°)
• Increased stability when
accelerating. Decreased
steering when entering
a corner.
Toe-In
Toe-In
8
8
Rotate the collar on the shock to change ride height. Adjust left and right equally.
RIDE HEIGHT
Distance the chassis sits from the ground and how much weight is transferred when the vehicle changes speed and direction.
Lower Rear:
Lower Rear:
More rear traction but reduces steering.
More rear traction but reduces steering.
Lower Front:
Lower Front:
Increases steering but can cause rear
Increases steering but can cause rear
end to lose traction.
end to lose traction.

9
9
SHOCK ADJUSTMENTS
DROOP
Distance the chassis can lift from ride height before the wheels come off the ground.
More Front Droop:
More Front Droop:
Increases chassis up travel when on throttle and decreases high speed steering,
Increases chassis up travel when on throttle and decreases high speed steering,
making vehicle turn smoother. Good for low traction and bumpy surfaces.
making vehicle turn smoother. Good for low traction and bumpy surfaces.
Less Front Droop:
Less Front Droop:
Decreases chassis up travel when on throttle, making steering more aggressive.
Decreases chassis up travel when on throttle, making steering more aggressive.
Good for high speed smooth surfaces.
Good for high speed smooth surfaces.
More Rear Droop:
More Rear Droop:
Increases chassis up travel when off throttle and under braking. Increases
Increases chassis up travel when off throttle and under braking. Increases
steering in low speed corners and under braking.
steering in low speed corners and under braking.
Less Rear Droop:
Less Rear Droop:
Decreases steering in low speed corners, making the vehicle turn smoother.
Decreases steering in low speed corners, making the vehicle turn smoother.
9
9
ROLL CENTER
Point at which the vehicle rolls laterally when cornering.
Higher Roll Center:
Higher Roll Center:
Increases the chassis roll on the rear
Increases the chassis roll on the rear
of the car. Increases rear traction on-power. Decreases rear
of the car. Increases rear traction on-power. Decreases rear
traction during braking.
traction during braking.
Lower
Lower
Roll Center:
Roll Center:
Decreases the chassis roll at the rear of
Decreases the chassis roll at the rear of
the car. Decreases rear on-power traction. Reduces corner
the car. Decreases rear on-power traction. Reduces corner
entry steering. Increases corner exit steering.
entry steering. Increases corner exit steering.
Higher Roll Center:
Higher Roll Center:
Reduces chassis roll and on-power
Reduces chassis roll and on-power
steering. The car feels more responsive. Reduces front traction
steering. The car feels more responsive. Reduces front traction
going into corners. Good for high grip, technical tracks.
going into corners. Good for high grip, technical tracks.
Lower
Lower
Roll Cente
Roll Cente
r:
r:
Increases the chassis roll and on-power
Increases the chassis roll and on-power
steering. Steering is less responsive, but smoother and more
steering. Steering is less responsive, but smoother and more
stable. Better for smooth tracks with high speed corners.
stable. Better for smooth tracks with high speed corners.
FRONT ROLL CENTER
FRONT ROLL CENTER
REAR ROLL CENTER
REAR ROLL CENTER

10
10
10
10
CHASSIS MAINTENANCE TIPS
Check before every run:
Check before every run:
1. All hardware to be sure everything is tight.
1. All hardware to be sure everything is tight.
2. Transmitter batteries.
2. Transmitter batteries.
3. Moving parts are free from binding.
3. Moving parts are free from binding.
4. Parts are not broken or damaged.
4. Parts are not broken or damaged.
5. Wires are properly connected.
5. Wires are properly connected.
6. Remove dirt or debris from chassis and moving parts.
6. Remove dirt or debris from chassis and moving parts.
7. Bearings should roll smoothly.
7. Bearings should roll smoothly.
8. Shocks should operate smoothly. Check for leakage and refill as needed.
8. Shocks should operate smoothly. Check for leakage and refill as needed.
9. Gear mesh between the spur and clutch gears.
9. Gear mesh between the spur and clutch gears.
WHEELBASE
SHOCK OIL
DIFFERENTIAL OIL
Distance between the front and rear wheels.
Decreases off power steering. Better
Decreases off power steering. Better
through rough sections. More stable.
through rough sections. More stable.
More on power steering.
More on power steering.
Increases rear on power traction.
Increases rear on power traction.
More off power steering.
More off power steering.
Thinner:
Thinner:
Increased traction. Chassis transitions quicker. Increased chance of the chassis
Increased traction. Chassis transitions quicker. Increased chance of the chassis
bottoming out. Better for rough tracks
bottoming out. Better for rough tracks
Thicker:
Thicker:
Decreased traction. Chassis transitions slower. Decreased chance of chassis
Decreased traction. Chassis transitions slower. Decreased chance of chassis
bottoming out. Better for smooth tracks.
bottoming out. Better for smooth tracks.
FRONT:
FRONT:
Thinner:
Thinner:
Increased off power steering (too thin will make it inconsistent.) Decreased on power steering.
Increased off power steering (too thin will make it inconsistent.) Decreased on power steering.
Thicker:
Thicker:
Increased stability while braking into a corner. Increased on power steering exiting a corner.
Increased stability while braking into a corner. Increased on power steering exiting a corner.
CENTER:
CENTER:
Thinner:
Thinner:
Better for rough track conditions. Causes the front to unload under acceleration. Decreases on power steering.
Better for rough track conditions. Causes the front to unload under acceleration. Decreases on power steering.
Thicker:
Thicker:
Better acceleration. Increases on power steering. Less stable. Better for smooth high bite tracks.
Better acceleration. Increases on power steering. Less stable. Better for smooth high bite tracks.
REAR:
REAR:
Thinner:
Thinner:
More rear traction in the corners. Increases mid corner steering.
More rear traction in the corners. Increases mid corner steering.
Thicker:
Thicker:
Decreases rear traction in the corners. Increases forward traction. Less mid corner steering
Decreases rear traction in the corners. Increases forward traction. Less mid corner steering
SHORTER WHEELBASE
SHORTER WHEELBASE
MEDIUM WHEELBASE
MEDIUM WHEELBASE
LONGER WHEELBASE
LONGER WHEELBASE

11
11
FOR MAINTENANCE AND REPAIRS ON YOUR 835B
FOR MAINTENANCE AND REPAIRS ON YOUR 835B

12
12
B(x2)
8x16mm
B(x1)
8x16mm
BB (x2)
4x5mm
BB (x1)
4x5mm
120 (x2)
2.5x13mm
120 (x1)
2.5x13mm
FF (x2)
6x13x0.1mm
PP (x1)
6x13x0.5mm
1
1
2
2
EE (x12)
4x7mm
3
3

13
13
13
13
R(x12)
3x12mm
4
4
5
5
6
6
B(x1)
8x16mm
FF (x1)
6x13x0.1mm
120 (x1)
2.5x13mm
B(x2)
8x16mm
FF (x2)
6x13x0.1mm
120 (x2)
2.5x13mm

14
14
7
7
8
8
9
9
E(x2)
3x10mm
JJ (x4)
4mm
E(x1)
3x10mm
155 (x2)
4x37mm
156 (x2)
4x62mm
B(x2)
8x16mm
NN (x1)
5x4mm

15
15
15
15
10
10
11
11
12
12
E(x2)
3x10mm
L(x4)
4x12mm
L(x4)
4x12mm
NN (x2)
5x4mm
108 (x2)
2.5x16mm
B(x4)
8x16mm
Y(x2)
3x30mm

16
16
16
16
14
14
15
15
CC (x2)
4x12mm
169 (x2)
HH (x2)
3mm
13
13
152 (x2)
3x40mm
19 (x2)
5x30mm

17
17
16
16
17
17
18
18
K(x2)
3x22mm
HH (x2)
3mm
AA (x2)
3x10mm
158 (x2)
HH (x2)
3mm
JJ (x2)
4mm
152 (x2)
3x40mm
157 (x2)
4x70mm
FRONT
x2

18
18
20
20
21
21
Z(x2)
3x3mm
149 (x2)
D(x2)
3x8mm
19
19
J(x2)
3x18mm

19
19
23
23
24
24
B(x2)
8x16mm
NN (x1)
5x4mm
E(x1)
3x10mm
E(x2)
3x10mm
JJ (x4)
4mm
22
22
155 (x2)
4x37mm
156 (x2)
4x62mm

20
20
26
26
27
27
X(x2)
3x20mm
E(x1)
3x10mm
25
25
Y(x2)
3x30mm