INTRODUCTION
The XRAY XB4 is a modern, high-competition premium luxury racing 1/10
electric 4WD off-road buggy that is the epitome of high-performance and
fine distinctive design. Your XB4 offers highest performance, responsive
handling, and traditionally exceptional XRAY quality, engineering, and
design. The superb craftsmanship and attention to detail are clearly evident
everywhere on the XRAY XB4.
XB4 was designed around a no compromise platform; the attention to detail
creates a low maintenance, extra long life nitro buggy. The ultra-low center
of gravity (CG) and optimized weight balance makes set-up, driving, and
maintenance easy and quick.
CUSTOMER SUPPORT
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 info@teamxray.com. 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
The XRAY XB4 was created by blending highest-quality materials and
excellent design. On high-speed flat tracks or bumpy tracks, whether driving
for fun or racing to win, the XB4 delivers outstanding performance, speed,
and precision handling.
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 info@teamxray.com.
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.
XRAY Europe
K Výstavisku 6992
91101 Trenčín
Slovakia, EUROPE
Phone: +421-32-7401100
Fax: +421-32-7401109
Email: info@teamxray.com
XRAY USA
RC America, 2030 Century Center Blvd #15
Irving, TX 75062
USA
Phone: (800) 519-7221 * (214) 744-2400
Fax: (214) 744-2401
Email: xray@rcamerica.com
Failure to follow these instructions will be considered as abuse and/or neglect.
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.
2
• 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.
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 R/C 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 shortcircuits, 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.
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 info@teamxray.com, or contact the XRAY
distributor in your country.
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 newlypurchased 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.
3
SYMBOLS USED
Part bags used
Assemble in the specified
order
05
Assemble left and right
sides the same way
Pay attention here
Assemble as many times
as specified (here twice)
Apply grease
Apply CA glue
WRONG
Follow Set-Up Book
2x
L=R
Apply oil
Apply thread lock
Apply cleaner
Ensure smooth
non-binding movement
Tighten screw
gently
CORRECT
The threads
are stripped.
Overtightened
OIL
FRONT & REAR AXLES
TOOLS REQUIRED
Scissors
(HUDY #188990)
Special Tool for turnbuckles,
nuts (HUDY #181090)
Combination Pliers
(HUDY #189020)
Side Cutters
(HUDY #189010)
Hobby Knife
Turnbuckle Wrench
3mm (HUDY #181030)
Reamer
(HUDY #107600)
or
(HUDY #107601)
m
3.0 m
HUDY TOOLS:
Allen 1.5mm
Socket 5.5mm
Allen 2.0mm
Socket 7.0mm
EQUIPMENT
INCLUDED
XRAY Premium Silicone Oils
Arm Reamer 3.0mm
NOT
INCLUDED
To ensure that you always have access to
the most up-to-date version of the Set-up
Book you can download the HUDY Set-up
Book from their web site at www.hudy.net.
By offering this online version instead of
including a hardcopy printed version in
kits, you will always be assured of having
the most current updated version.
Graphite Grease
(HUDY #106210)
XRAY offers wide range of optional
tuning parts which are listed in a
table like this. Please refer to the
#36XXXX OPTION 1
exploded view of each main section
#36XXXX OPTION 2 to verify which part is included in
#36XXXX OPTION 3 the kit while all other parts are
available only as an optional part
and must be purchased separately.
SAMPLE OF
OPTIONAL PARTS
EQUIPMENT REQUIRED
4
Transmitter
Receiver
Steering Servo
Pinion Gear and Setscrew
Electric Motor
Bearing Oil
(HUDY #106230)
Speed Controller
LiPo Battery
Lexan™ Paint
Battery Charger
Double-sided Tape
Tires & Inserts
XB4 TECH TIPS
TIP
DRIVE SHAFT PIN SERVICING
To enjoy the longest possible lifespan of the drive shafts and diff outdrives, it is extremely important to properly service the drive shaft pins.
Inspect the pins after every 3 hours of runtime. If the pins show any wear, replace them with new pins.
Do not use drive shafts when
the pins are worn.
TIP
Press out the worn pins.
GRAPHITE PARTS PROTECTION
For easy and comfortable drive pin replacements use
#106000 HUDY Drive Pin Replacement Tool.
To replace the worn pins use only
premium HUDY drive pins #106051.
SHOCK TOWER PROTECTION
Please follow the instruction manual and seal the edges of the shock towers with CA to reinforce them and help
prevent delamination.
Follow this tech tip to protect the following graphite parts:
Protect all XB4
Graphite Parts:
Press in new pins and
regularly inspect for wear.
Fine sandpaper
Use fine sandpaper to
sand smooth the edges of
all graphite parts.
• Front shock tower
• Rear shock tower
Apply CA glue to all edges
of the graphite parts.
MOTOR POSITION ALTERNATIVES
The XB4 can be assembled to fit either the saddle battery pack or short battery pack. Depending on the version you choose to build you have to follow the assembly instructions. The Instruction Manual shows the
assembly of saddle pack batteries. If you want to build the car with the alternative short battery pack (rearward motor position), follow the supplementary instructions starting on page 39 (using parts from Bag 09).
FORWARD MOTOR POSITION
REARWARD MOTOR POSITION
SADDLE PACK BATTERIES
SHORT BATTERY PACK
INITIAL ASSEMBLY
PAGES 6~38.
INITIAL ASSEMBLY
PAGES 39~44.
5
1. FRONT & REAR DIFFERENTIAL
981210
BEVEL & SATELITTE GEARS + PINS
941015
#304930 + #304980 COMPOSITE (STANDARD)
#335030 + #335080 STEEL (OPTION)
964031
972050
304930
BEVEL GEARS
#364935
GRAPHITE (OPTION)
#364945
ALU (OPTION)
#364955
STEEL (STANDARD)
364960
304980
364910
964050
964050
304930
304990
364990
981210
OPTIONAL:
#365000 BALL ADJUSTABLE DIFFERENTIAL
SET - HUDY SPRING STEEL™
972050
964031
364955
941015
903258
Suggested to use with #365114 Graphite
Composite Bevel Drive Gear 14T.
364960
BAG
30 4930
30 4980
30 4990
36 4900
36 4910
36 4955
36 4960
COMPOSITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4)
COMPOSITE GEAR DIFF CROSS PIN
DIFF GASKET (4)
GEAR DIFFERENTIAL - SET
COMPOSITE GEAR DIFFERENTIAL CASE
STEEL DIFFERENTIAL BEVEL GEAR 35T
GEAR DIFF OUTDRIVE ADAPTER - HUDY SPRING STEEL™ (2)
36 4990
90 3258
94 1015
96 4031
96 4050
97 2050
98 1210
2x
COMPOSITE BEVEL GEAR BUSHING (2)
HEX SCREW SFH M2.5x8 (10)
HIGH-SPEED BALL-BEARING 10x15x4 RUBBER SEALED (2)
WASHER S 3.5x10x0.2 (10)
WASHER S 5x15x0.3 (10)
SILICONE O-RING 5x2 (10)
PIN 2x10 (10)
STEP ➍➎ DETAIL
➍
➍
➎
964050
S 5x15x0.3
OIL
➌
➋
972050
➎
O 5x2
OIL
981210
➊
P 2x10
DO NOT USE for ALU or GRAPHITE gears
2x
NOTE ORIENTATION
964050
S 5x15x0.3
➊
STEP ➍ DETAIL
Use tweezers to
insert pin
➍
➌
972050
OIL
➋
➎
O 5x2
OIL
981210
P 2x10
6
CUTAWAY VIEW
FRONT & REAR DIFFERENTIAL
2x
Front diff
OIL
Silicone oil 8 000cSt
Fill just above the
satellite gears.
964031
S 3.5x10x0.2
PROPER AMOUNT OF OIL IN THE DIFFS
Use a digital scale to measure the exact amount
of oil in the diff. Remember that during operation
the diff gets hotter and the heat may allow the oil
to expand. If there is too much oil inside it may
interfere with the diff operation and damage the
internal gears.
Rear diff
Silicone oil 8 000cSt
Fill just above the
satellite gears.
Fill differential up to the top of the
diff pin. DO NOT fill the diff to the
top of the housing.
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
9.80g
11.12g
9.80g + 1.32g = 11.12g
➊ Put the diff (without oil) on the scale and check the
weight (approximately 9.80g)
➋ Slowly pour oil into the diff and watch the weight. Add
1.32g of oil into the diff. The approximate weight of the diff
including oil is 11.12g.
TIPS FOR DIFFERENTIALS
FRONT DIFERENTIAL
DIFFERENTIAL OIL
2x
REAR DIFERENTIAL
LOW TRACTION
5 000cSt (HUDY #106450)
MEDIUM-HIGH TRACTION 8 000cSt (HUDY #106480)
SUPER-HIGH TRACTION 10 000cSt (HUDY #106510)
LOW TRACTION
5 000cSt (HUDY #106450)
MEDIUM-HIGH TRACTION 8 000cSt (HUDY #106480)
SUPER-HIGH TRACTION 10 000cSt (HUDY #106510)
NOTE:
Softer oil increases steering, harder oil increases stability.
NOTE:
Softer oil increases rear traction, harder oil increases on-power steering.
2x
Tighten the screws equally but do NOT
tighten them completely.
2x
903258
SFH M2.5x8
OIL
941015
BB 10x15x4
➊
➍
➌
➋
OIL
Finish tightening in
this order.
7
2. REAR CENTRAL TRANSMISSION
MARKED “R“
IMPORTANT
REAR BLOCK
363080
902310
365423
980210
365470
362001
365230
365440
940510
365134
364900+364955
940815
902306
BEVEL DRIVE GEARS
#365114
GRAPHITE (OPTION)
#365134
STEEL (STANDARD)
BAG
980210
P 2x10
36 2001
36 3080
36 5134
36 5230
36 5423
36 5440
36 5470
362001
DIFF BULKHEAD BLOCK SET REAR - V2
GRAPHITE SHOCK TOWER REAR 3.0MM - V3
STEEL BEVEL DRIVE GEAR 14T
DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
CENTRAL DRIVE SHAFT 64MM - HUDY SPRING STEEL™
CENTRAL SHAFT UNIVERSAL JOINT
COMPOSITE DRIVE SHAFT SAFETY COLLAR - V2 (3)
902310
90 2306
90 2310
94 0510
94 0815
98 0210
HEX SCREW SH M3x6 (10)
HEX SCREW SH M3x10 (10)
HIGH-SPEED BALL-BEARING 5x10x4 RUBBER SEALED (2)
HIGH-SPEED BALL-BEARING 8x14x4 RUBBER SEALED (2)
PIN 2x10 (10)
36 4900
36 4955
GEAR DIFFERENTIAL - SET
STEEL DIFFERENTIAL BEVEL GEAR 35T
DRIVE SHAFT COVER CAPS
Lubricate the drive shaft connecting joint properly so the drive shaft turns
freely. In the event that not enough grease is used, the connecting pin may lock
and may even, in extreme situations, push through the drive shaft cover cap.
CENTRAL DRIVE SHAFT (64MM)
DRIVE SHAFT COLLAR
➋
➌
#365470
COMPOSITE (STANDARD)
#365471-K ALU - BLACK (OPTION)
#365471-O ALU - ORANGE (OPTION)
➊
GRAPHITE GREASE
(HUDY #106210)
8
➍
REAR CENTRAL TRANSMISSION
DETAIL
When installing the gear on the axle, make sure the
flat spot of the gear sits on the flat spot of the axle.
902306
SH M3x6
NOTE ORIENTATION
➍
OIL
940510
BB 5x10x4
➊
NOTE ORIENTATION
OIL
IMPORTANT
REAR BLOCK
THREAD LOCK
940815
BB 8x14x4
➋
GRAPHITE GREASE
(HUDY #106210)
➌
➎
902310
SH M3x10
NOTE ORIENTATION
REAR DIFF 8 000 cSt
NOTE ORIENTATION
902310
SH M3x10
Follow the TECH TIP on page 5
to protect graphite parts
9
2. FRONT CENTRAL TRANSMISSION
MARKED “F“
IMPORTANT
FRONT BLOCK
365422
980210
365440
940510
365230
365470
365134
364900+ 364955
362000
362000
940815
902306
902310
BEVEL DRIVE GEARS
362081
#365114
GRAPHITE (OPTION)
#365134
STEEL (STANDARD)
BAG
980210
P 2x10
36 2000
36 2081
36 5134
36 5230
36 5422
36 5440
36 5470
90 2306
902310
DIFF BULKHEAD BLOCK SET FRONT - V2
GRAPHITE SHOCK TOWER FRONT 3.5MM
STEEL BEVEL DRIVE GEAR 14T
DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
CENTRAL DRIVE SHAFT 116MM - HUDY SPRING STEEL™
CENTRAL SHAFT UNIVERSAL JOINT
COMPOSITE DRIVE SHAFT SAFETY COLLAR - V2 (3)
HEX SCREW SH M3x6 (10)
90 2310
94 0510
94 0815
98 0210
HEX SCREW SH M3x10 (10)
HIGH-SPEED BALL-BEARING 5x10x4 RUBBER SEALED (2)
HIGH-SPEED BALL-BEARING 8x14x4 RUBBER SEALED (2)
PIN 2x10 (10)
36 4900
36 4955
GEAR DIFFERENTIAL - SET
STEEL DIFFERENTIAL BEVEL GEAR 35T
DRIVE SHAFT COVER CAPS
Lubricate the drive shaft connecting joint properly so the drive shaft turns
freely. In the event that not enough grease is used, the connecting pin may lock
and may even, in extreme situations, push through the drive shaft cover cap.
CENTRAL DRIVE SHAFT (116MM)
➋
➌
DRIVE SHAFT COLLAR
#365470
COMPOSITE (STANDARD)
#365471-K ALU - BLACK (OPTION)
#365471-O ALU - ORANGE (OPTION)
➊
Graphite Grease
(HUDY #106210)
10
➍
FRONT CENTRAL TRANSMISSION
DETAIL
When installing the gear on the axle, make sure the
flat spot of the gear sits on the flat spot of the axle.
902306
SH M3x6
NOTE ORIENTATION
➍
940510
OIL
BB 5x10x4
➊
NOTE ORIENTATION
IMPORTANT
FRONT BLOCK
GRAPHITE GREASE
(HUDY #106210)
OIL
THREAD LOCK
940815
➋
BB 8x14x4
➌
➎
902310
SH M3x10
NOTE ORIENTATION
FRONT DIFF 8 000 cSt
902310
SH M3x10
NOTE ORIENTATION
Follow the TECH TIP on page 5
to protect graphite parts
11
3. REAR SUSPENSION
903312
363121
363321
362315
367210
306219
362315
363111
902308
363311
903312
901304
362001
ANTI-ROLL BARS
901303
303431-K
303454
#362470
1.0mm (OPTION)
#362471
1.1mm (OPTION)
#362472
1.2mm (STANDARD)
#362473
1.3mm (OPTION)
#362474
1.4mm (OPTION)
#362476
1.6mm (OPTION)
#362478
1.8mm (OPTION)
901308
Remove the 3x6.5x2mm shim from each rear arm, this shim
will be used in Rear Transmition section on page 19, step 1.
303454
OPTIONAL
For better stability and to make the car easier to drive, optional #362190 and #363190 graphite stiffeners may be used. Using only 4 screws, the
graphite stiffener can be installed or removed which would completely change the characteristics of the car. Stiffeners may be used independently at
front and/or rear.
IMPORTANT! Install / remove stiffeners equally on left & right sides.
2x
#363190
GRAPHITE REAR LOWER ARM PLATE 1.6MM (2) (OPTION)
BAG
12
30 3431-K
30 3454
30 6219
36 2001
36 2315
36 2470
36 2471
36 2472
36 2473
36 2474
36 2476
36 2478
ALU 4.9MM BALL END - BLACK (2)
BALL JOINT 4.9MM - OPEN (4)
COMPOSITE SET OF SERVO SHIMS (4)
DIFF BULKHEAD BLOCK SET REAR - V2
ECCENTRIC BUSHING SET (2)
ANTI-ROLL BAR 1.0 MM (OPTION)
ANTI-ROLL BAR 1.1 MM (OPTION)
ANTI-ROLL BAR 1.2 MM
ANTI-ROLL BAR 1.3 MM (OPTION)
ANTI-ROLL BAR 1.4 MM (OPTION)
ANTI-ROLL BAR 1.6 MM (OPTION)
ANTI-ROLL BAR 1.8 MM (OPTION)
36 3111
36 3121
36 3311
36 3313
36 3321
36 7210
COMPOSITE SUSPENSION ARM REAR LOWER RIGHT
COMPOSITE SUSPENSION ARM REAR LOWER LEFT
ALU REAR LOWER SUSP. HOLDER +2 - FRONT - 7075 T6 (5MM)
BRASS REAR LOWER SUSPENSION HOLDER SET +2 - RR+RF (OPTION)
ALU REAR LOWER SUSP. HOLDER +2 - REAR - 7075 T6 (5MM)
SUSPENSION PIVOT PIN (2)
90 1303
90 1304
90 1308
90 2308
90 3312
HEX SCREW
HEX SCREW
HEX SCREW
HEX SCREW
HEX SCREW
SB M3x3 (10)
SB M3x4 (10)
SB M3x8 (10)
SH M3x8 (10)
SFH M3x12 (10))
REAR SUSPENSION
IMPORTANT
REAR BLOCK
306219
SHIM 3x6x2
Check for free movement
903312
SFH M3x12
Marked “L”
➍
➌ RR
INITIAL POSITION
1º
0.5º
0º
0.5º
➊
1º
➋
Composite eccentric bushings
ARM
ARM
3x6x2mm
Marked “R”
➌RF
➊
➍
INITIAL POSITION
If the suspension arm does not move freely use a
HUDY Arm Reamer to size the holes of the arms
1º
0.5º
0º
0.5º
1º
Arm Reamer 3.0mm (HUDY #107633)
Composite eccentric bushings
TOE-IN
ANTI-SQUAT
ROLL CENTER
TRACK WIDTH
All possible mounting
alternatives of eccentric bushings
ECCENTRIC BUSHINGS HAVE TWO DIFFERENT OFFSETS FROM THE CENTER.
Middle position = 0.5° or 0.375mm from center.
Outer position = 1° or 0.75mm from center.
The XRAY rear alu lower suspension holders provide great range of adjustment for the rear suspension. Using different combinations of eccentric bushings, fine adjustment of rear anti-squat, rear toe-in, rear
roll center, and rear track-width can be obtained. For more information about the influence of rear anti-squat, rear toe-in, rear roll center and rear track width on car handling, please refer to HUDY Set-up Book
(#209100).
RR
ANTI-SQUAT
RF
(°)
RR
ROLL-CENTER
RF
(mm)
RR
TRACK WIDTH
RF
(mm)
RR
TOE-IN
RF
(°)
=2°
=+0.75mm
=+1.5mm
=3°
=3°
=0mm
=0mm
=4°
=1°
=-0.75mm
=-1.5mm
=2°
=3°
The track width is directly influenced by the size of
the wheels and tires used.
=2°
=4°
=1°
=2°
=0°
The tables describe the amounts of adjustment using the center and outside positions of
the eccentric bushings.
The middle position eccentric bushings allow for finer adjustment increments.
=2°
=3°
=1°
=4°
=5°
Example:
0(RR) - 0 (RF) = 2°
= 2°
0(RR) - 0.5 (RF) = 2.5°
= 2.5°
0(RR) - 1 (RF) = 3°
= 3°
=3°
13
REAR SUSPENSION
2x
L=R
901308
SB M3x8
ASSEMBLY VIEW
1.5mm
4mm
STEP ➌ DETAIL
901303
L=R
SB M3x3
0mm
901304
SB M3x4
902308
SH M3x8
➌ 3x3
➋
➊
3x4
3x8
DETAIL
Step ➊ check for free movement
ANTI-ROLL BAR
14
DETAIL
Step ➊
Loosen the 3x4 setscrew if
the anti-roll bar does not
turn freely
3. FRONT SUSPENSION
903312
362315
362320
367210
306219
362315
362310
903312
361200
362111
901303
902308
ANTI-ROLL BARS
303454
#362470 1.0mm (OPTION)
#362471 1.1mm (OPTION)
#362472 1.2mm (STANDARD)
901308
303431-K
#362473 1.3mm (OPTION)
362000
#362474 1.4mm (OPTION)
901304
303454
#362476 1.6mm (OPTION)
902308
#362478 1.8mm (OPTION)
OPTIONAL
For better stability and to make the car easier to drive, optional #362190 and #363190 graphite stiffeners may be used. Using only 4 screws, the
graphite stiffener can be installed or removed which would completely change the characteristics of the car. Stiffeners may be used independently at
front and/or rear.
IMPORTANT! Install / remove stiffeners equally on left & right sides.
2x
#362190
GRAPHITE FRONT LOWER ARM PLATE 1.6MM (2) (OPTION)
BAG
30 3431-K
30 3454
30 6219
36 1200
36 2000
36 2111
36 2310
36 2315
36 2320
36 2470
36 2471
36 2472
ALU 4.9MM BALL END - BLACK (2)
BALL JOINT 4.9MM - OPEN (4)
COMPOSITE SET OF SERVO SHIMS (4)
COMPOSITE BUMPER - V2
DIFF BULKHEAD BLOCK SET FRONT - V2
COMPOSITE SUSPENSION ARM FRONT LOWER
ALU FRONT LOWER SUSP. HOLDER - FRONT - 7075 T6 (5MM)
ECCENTRIC BUSHING SET (2)
ALU FRONT LOWER SUSP. HOLDER - REAR - 7075 T6 (5MM)
ANTI-ROLL BAR 1.0 MM (OPTION)
ANTI-ROLL BAR 1.1 MM (OPTION)
ANTI-ROLL BAR 1.2 MM
36 2473
36 2474
36 2476
36 2478
36 7210
ANTI-ROLL BAR 1.3 MM (OPTION)
ANTI-ROLL BAR 1.4 MM (OPTION)
ANTI-ROLL BAR 1.6 MM (OPTION)
ANTI-ROLL BAR 1.8 MM (OPTION)
SUSPENSION PIVOT PIN (2)
90 1303
90 1304
90 1308
90 2308
90 3312
HEX SCREW
HEX SCREW
HEX SCREW
HEX SCREW
HEX SCREW
SB M3x3 (10)
SB M3x4 (10)
SB M3x8 (10)
SH M3x8 (10)
SFH M3x12 (10))
15
FRONT SUSPENSION
IMPORTANT
FRONT BLOCK
306219
SHIM 3x6x2
903312
Check for free movement
SFH M3x12
➍
➌ FR
➊
INITIAL POSITION
1º
0.5º
0º
0.5º
➋
1º
3x6x2mm
Composite eccentric bushings
➌ FF
➊
➍
INITIAL POSITION
If the suspension arm does not move freely use a
HUDY Arm Reamer to size the holes of the arms
1º
Arm Reamer 3.0mm (HUDY #107633)
L=R
0.5º
0º
0.5º
1º
Composite eccentric bushings
All possible mounting alternatives
of eccentric bushings
FRONT ARM
ECCENTRIC BUSHINGS HAVE TWO DIFFERENT OFFSETS FROM THE CENTER.
KICK UP
ROLL CENTER
TRACK WIDTH
Middle position = 0.5° or 0.375mm from center.
Outer position = 1° or 0.75mm from center.
The XRAY alu front lower suspension holders provide great range of adjustment for the front suspension. Using different combinations of eccentric bushings, fine adjustment of front kick-up, roll-center, and front
track-width can be obtained. For more information about the influence of kick-up, front track-width, and roll centers on car handling, please refer to HUDY Set-up Book (#209100).
FF
KICK-UP
FR
(°)
ROLL-CENTER
FR
(mm)
FF
TOTAL CASTER=C-HUB CASTER+KICK UP
TRACK WIDTH
FR
(mm)
=+1.5mm
=9°
=+0.75mm
=8°
= 0mm
= 0mm
=10°
=-0.75mm
=-1.5mm
=8°
=7°
=9°
=10°
=9°
=11°
16
FF
KICK-UP
C-HUB CASTER 7°
8°
9°
10°
11°
6°
13°
14°
15°
16°
17°
9°
16°
17°
18°
19°
20°
The track width is directly influenced by the size of the
Caster is the angle between the steering pivot
wheels and tires used.
axis and the vertical plane. Caster is affected not
The tables describe the amounts of adjustment using the center and outside positions of the eccentric bushings.
only by the C-Hub caster, but also by the front
kick-up angle relative to the flat chassis bottom.
The middle position eccentric bushings allow for finer adjustment increments.
The table indicates how kick up angle effects
total caster.
Example:
0(FF) - 0(FR) = 9°
= 9°
0.5(FF) - 0(FR) = 9.5°
= 9.5°
1(FF) - 0(FR) = 10°
= 10°
The XB4’s stock caster blocks are 9°, but 6°
blocks are available as an option.
FRONT SUSPENSION
2x
ASSEMBLY VIEW
L=R
1.5mm
901308
4mm
SB M3x8
902308
SH M3x8
STEP ➌ DETAIL
901303
0mm
L=R
SB M3x3
901304
SB M3x4
➌ 3x3
902308
SH M3x8
➋
➊
3x4
3x8
DETAIL
DETAIL
Step ➊ check for free movement
ANTI-ROLL BAR
Step ➊
Loosen the 3x4 setscrew if
the anti-roll bar does not
turn freely
17
4. REAR TRANSMISSION
363520
DRIVE SHAFT COLLAR
#365470
COMPOSITE (STANDARD)
#365471-K ALU - BLACK (OPTION)
#365471-O ALU - ORANGE (OPTION)
REAR UPRIGHTS
#363350
COMPOSITE (STANDARD)
#363351
ALU (OPTION)
363350
365320
980210
365470
365230
365340
902205
940510
940512
902310
302665
363111
363121
365350
362651
901306
960030
362610
362650
BAG
980210
30 2665
36 2610
36 2650
36 2651
36 3111
36 3121
36 3350
36 3520
36 5230
36 5320
36 5340
36 5350
2x
367320
302665
COMPOSITE BALL JOINT 4.9MM - CLOSED WITH HOLE (4)
ADJ. TURNBUCKLE M3 L/R 50 MM - SPRING STEEL (2)
BALL END 4.9MM WITH THREAD 6MM (2)
BALL END 4.9MM WITH THREAD 8MM (2)
REAR SUSPENSION ARM - RIGHT
REAR SUSPENSION ARM - LEFT
COMPOSITE UPRIGHT REAR - V2
REAR WING POST - V2 (2)
DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
REAR DRIVE SHAFT 68MM - HUDY SPRING STEEL™
REAR DRIVE AXLE - HUDY SPRING STEEL™
ALU WHEEL HUB 14MM (2)
ALU WHEEL HUB 14MM - OFFSET “-0.75MM” (2) (OPTION)
ALU WHEEL HUB 14MM - OFFSET “+0.75MM” (2) (OPTION)
COMPOSITE DRIVE SHAFT SAFETY COLLAR (3)
REAR ARM PIVOT PIN (2)
90 1306
90 2205
90 2310
94 0510
94 0512
96 0030
98 0210
HEX SCREW SB M3x6 (10)
HEX SCREW SH M2x5 (10)
HEX SCREW SH M3x10 (10)
HIGH-SPEED BALL-BEARING 5x10x4 RUBBER SEALED (2)
HIGH-SPEED BALL-BEARING 5x12x4 RUBBER SEALED (2)
NUT M3 (10)
PIN 2x10 (10)
2x
DRIVE SHAFT (68mm)
L=R
36 5351
36 5352
36 5470
36 7320
L=R
P 2x10
OIL
940510
Bearing Oil
(HUDY #106230)
➋
➌
➊
BB 5x10x4
Graphite Grease
(HUDY #106210)
➍
LONG AXLE
5x10x4
5x12x4
940512
BB 5x12x4
980210
P 2x10
2x
OPTIONAL HEX HUB EFFECTS
WHEEL HUBS 14MM
Different off-set hex hubs are used to
increase or decrease the track-width.
#365352 +0.75mm (OPTION)
#365350 0mm
L=R
(STANDARD)
#365351 -0.75mm (OPTION)
902205
SH M2x5
LESS OFF-SET
Rear - more traction
Front - more steering
MORE OFF-SET
Rear - less traction
Front - less steering
WHEEL HUBS 12MM
#365357 +2.25mm (OPTION)
#365356 +1.5mm (OPTION)
➌
#365355 +0.75mm (OPTION)
#365353 0mm
(OPTION)
#365354 -0.75mm (OPTION)
➋
18
➊
REAR TRANSMISSION
IMPORTANT!
901306
SB M3x6
When using OUTSIDE position on the hub,
use only outside position on the arm.
The outside hole offers great stability and is
recommended for bumpy open tracks.
When using INSIDE position on the hub,
use only inside position on the arm.
Inside hole offers great amount of steering
and is recommended for flat, technical tracks.
Check for free
movement
From Rear Arm
SHIM 3x6.5x2
Use shim 3x6.5x2mm from rear arm (Bag 3)
SHORTER WHEELBASE
Ensure that the rear upright moves freely.
If it does not move freely, use sandpaper to
thin both wheelbase adjustment shims.
ARM
VIEW
Alternative Shim
BEHIND HUB
NOTE
ORIENTATION
INITIAL POSITION
LONG
SHORT
ARM
LONGER WHEELBASE
VIEW
Alternative Shim
IN FRONT OF HUB
1:1
SHO
RT
WHEELBASE
DO NOT OVERTIGHTEN
2x
NOTE
ORIENTATION
LON
G
RIGHT
THREAD
L=R
1:1 2x
6mm thread
LEFT
THREAD
8mm thread
SHORT
LONG
L=R
33.5 mm
CAMBER
2x
NOTE
ORIENTATION
L=R
INITIAL POSITION
960030
N M3
NOTE
ORIENTATION
L=R
6mm
THREAD
INITIAL POSITION
8mm
THREAD
L=R
ROLL CENTER
2x
L=R
902310
SH M3x10
19
4. FRONT TRANSMISSION
302665
DRIVE SHAFT COLLAR
#365470
COMPOSITE (STANDARD)
#365471-K ALU - BLACK
C-HUBS
362652
362280
(OPTION)
303122
#365471-O ALU - ORANGE (OPTION)
#362210 RIGHT 9° (STANDARD)
362651
362610
#362211 RIGHT 6°
960030
#362221 LEFT 6°
902314
362651
(OPTION)
362210
980210
362280
(OPTION)
#362220 LEFT 9° (STANDARD)
365240
362291
940512
365220
362220
902205
365470
940510 365230
362250
365350
901306
902312
362290
367220
BAG
980210
30 2665
30 3122
36 2210
36 2211
36 2220
36 2221
36 2250
36 2280
36 2290
36 2291
36 2610
36 2651
36 2652
36 5220
36 5230
2x
COMPOSITE BALL JOINT 4.9MM - CLOSED WITH HOLE (4)
ALU SHIM 3x6x1.0MM (10)
COMPOSITE C-HUB 9° DEG. RIGHT
COMPOSITE C-HUB 6° DEG. RIGHT (OPTION)
COMPOSITE C-HUB 9° DEG. LEFT
COMPOSITE C-HUB 6° DEG. LEFT (OPTION)
COMPOSITE STEERING BLOCK
ALU CONICAL SHIM 3x6x2.0MM (10)
STEEL STEERING BUSHING - SHORT (2)
STEEL STEERING BUSHING - LONG (2)
ADJ. TURNBUCKLE M3 L/R 50 MM - SPRING STEEL (2)
BALL END 4.9MM WITH THREAD 8MM (2)
BALL END 4.9MM WITH THREAD 10MM (2)
FRONT DRIVE SHAFT 81MM - HUDY SPRING STEEL™
DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
90 1306
90 2205
90 2312
90 2314
94 0510
94 0512
96 0030
98 0210
HEX SCREW SB M3x6 (10)
HEX SCREW SH M2x5 (10)
HEX SCREW SH M3x12 (10)
HEX SCREW SH M3x14 (10)
HIGH-SPEED BALL-BEARING 5x10x4 RUBBER SEALED (2)
HIGH-SPEED BALL-BEARING 5x12x4 RUBBER SEALED (2)
NUT M3 (10)
PIN 2x10 (10)
OIL
BEARING OIL
(HUDY #106230)
P 2x10
➋
➌
FRONT DRIVE AXLE - HUDY SPRING STEEL™
ALU WHEEL HUB 14MM (2)
ALU WHEEL HUB 14MM - OFFSET “-0.75MM” (2) (OPTION)
ALU WHEEL HUB 14MM - OFFSET “+0.75MM” (2) (OPTION)
COMPOSITE DRIVE SHAFT SAFETY COLLAR (3)
FRONT ARM PIVOT PIN (2)
➊
DRIVE SHAFT (81mm)
L=R
36 5240
36 5350
36 5351
36 5352
36 5470
36 7220
➌
➊
940510
BB 5x10x4
5x10x4
➍
GRAPHITE GREASE
(HUDY #106210)
SHORT AXLE
940512
BB 5x12x4
902205
2x
Effects of option hex hubs - see page 18/step 2.
DETAIL
L=R
➌
➋
5x12x4
➊
LOWER ROLL CENTER
Longer
SH M2x5
TOP = LONGER bushing & 3x14 screw
BOTTOM = SHORTER bushing & 3x12 screw
➋
362280
Recommended for rough tracks to improve
stability.
CON. SHIM 3x6x2
IMPORTANT
➊ Shorter
➌
902312 902314
SH M3x12
SH M3x14
CASTER
ROLL-CENTER
20
When inserting the bushings,
make sure that bushings are
inserted equally on both
right and left hub to make
the same roll center position.
Steel steering bushings allow
roll-center adjustment.
DETAIL
HIGHER ROLL CENTER
TOP = SHORTER bushing & 3x12 screw
BOTTOM = LONGER bushing & 3x14 screw
Recommended for smooth tracks to gain
more steering.
8mm
THREAD
NOTE
ORIENTATION
CONICAL SHIM
3x6x2
FRONT TRANSMISSION
2x
Check for free
movement
L=R
901306
SB M3x6
DO NOT OVERTIGHTEN
➋
9mm
20mm
SHO
RT
NOTE
ORIENTATION
1:1
2x
L=R
LON
G
10mm
THREAD
ARM REAMER
If the C-hub does not move freely, use a HUDY Arm Reamer to
resize the hole.
➊
2x
RIGHT
THREAD
L=R
(HUDY #107633)
L=R
34 mm
LEFT
THREAD
8mm
THREAD
CAMBER
2x
NOTE
ORIENTATION
L=R
303122
SHIM 3x6x1
362280
CON. SHIM 3x6x2
NOTE
ORIENTATION
960030
8mm THREAD
N M3
10mm THREAD
CONICAL SHIM 3x6x2
3x6x1
(DO NOT USE IN INITIAL SET UP)
INITIAL POSITION
ROLL CENTER
21
4. FRONT & REAR ASSEMBLY
902316
902312
361320
361182
903314
361291
361292
960030
961032
361263
361263
361102
902314
903310
903310
903310
903308
BAG
22
36 1182
36 1291
36 1292
36 1320
COMPOSITE REAR LOWER BRACE
COMPOSITE CHASSIS BRACE FRONT
COMPOSITE CHASSIS BRACE REAR
BODY MOUNT, BATTERY MOUNT - V2 & WING SHIM (2)
90 2312
90 2314
90 2316
HEX SCREW SH M3x12 (10)
HEX SCREW SH M3x14 (10)
HEX SCREW SH M3x16 (10)
903310
902314
903310
90 3308
90 3310
90 3314
96 0030
96 1032
HEX SCREW SFH M3x8 (10)
HEX SCREW SFH M3x10 (10)
HEX SCREW SFH M3x14 (10)
NUT M3 (10)
WASHER S 3.2 (10)
36 1102
36 1263
ALU CHASSIS - SWISS 7075 T6 (2MM)
COMPOSITE CHASSIS SIDE GUARDS L+R
FRONT & REAR ASSEMBLY
903308
SFH M3x8
903310
SFH M3x10
903314
SFH M3x14
960030
N M3
961032
S 3.2
3x14
3x8
3x10
CHASSIS FLEX SETTING
903310
SFH M3x10
Screws for Multi-Flex™ setting.
For more details see page 45.
23
4. FRONT & REAR ASSEMBLY
3x16
OPTIONAL
To raise the rear differential and rear suspension use
these two optional parts together.
902314
SH M3x14
#361262
Composite Rear Chassis Plate
#361181
Graphite Rear Lower Brace 2.0mm
902316
SH M3x16
903310
3x10
3x14
3x10
SFH M3x10
3x12
902312
SH M3x12
902314
SH M3x14
903310
24
3x14
3x10
3x10
3x10
3x14
3x10
SFH M3x10
5. STEERING
902306
STEERING PLATE
#362571
COMPOSITE (STANDARD)
#362573
ALU (OPTION)
362580
940508
362290
362510
362571
302665
940508
902310
362540
362610
362280
362290
302665
362510
362652
902310
362510
302665
362610
332561
302665
332540
970100
940508
362550
303125
903310
BAG
30 2665
30 3125
33 2540
33 2561
36 2280
36 2290
36 2510
36 2540
36 2550
36 2571
COMPOSITE BALL JOINT 4.9MM - CLOSED WITH HOLE (4)
ALU SHIM 3x6x3.0MM (10)
ALU SERVO SAVER ADJUSTABLE NUT
SERVO SAVER SPRING C=14
ALU CONICAL SHIM 3x6x2.0MM (10)
STEEL STEERING BUSHING - SHORT (2)
COMPOSITE SERVO SAVER
ALU SERVO SAVER MAIN SHAFT
SERVO SAVER PIVOT SHAFT (2)
COMPOSITE STEERING PLATE
36 2580
36 2610
36 2652
STEERING BRACE 2.0MM GRAPHITE
ADJ. TURNBUCKLE M3 L/R 50 MM - SPRING STEEL (2)
BALL END 4.9MM WITH THREAD 10MM (2)
90 2306
90 2310
90 3310
94 0508
97 0100
HEX SCREW SH M3x6 (10)
HEX SCREW SH M3x10 (10)
HEX SCREW SFH M3x10 (10)
HIGH-SPEED BALL-BEARING 5x8x2.5 RUBBER SEALED (2)
O-RING 10 x 1.5 (10)
OIL
THREAD LOCK
970100
O 10x1.5
INITIAL PRELOAD SETTING
2mm
CLEANER
SERVO SAVER
25
STEERING
3x6
3x6
902306
SH M3x6
902310
SH M3x10
3x10
3x10
940508
BB 5x8x2.5
903310
SFH M3x10
3x6x3
303125
SHIM 3x6x3
2x
L=R
32mm
LEFT
THREAD
RIGHT THREAD
LEFT THREAD
RIGHT
THREAD
2x
L=R
362280
NOTE ORIENTATION
Adjustment block towards outside
CON. SHIM 3x6x2
INITIAL POSITION
CONICAL SHIM
3x6x2
ACKERMANN
BUMP STEER
TOE-IN
26
NOTE ORIENTATION
Adjustment block towards outside
NOTE ORIENTATION
Check for free
movement
Check for free
movement
6. SLIPPER CLUTCH ASSEMBLY
OPTIONAL:
#364021 ALU CENTRAL
BULKHEAD
361320
OPTIONAL:
#364901 GEAR CENTER
DIFFERENTIAL - SET
902310
361165
361164
902310
364111
903308
941015
980212
361184
981208
364022
902308
364130
364120
365781
903310
903308
364190
902318
364011
364120
902305
364181
901304
903310
SLIPPER CLUTCH SPUR GEARS
364171
941015
BAG
36 1163
36 1164
36 1165
36 1184
36 1320
36 1321
36 4011
36 4022
36 4111
36 4120
36 4130
36 4171
36 4181
361321
361163
364130
GRAPHITE FRONT UPPER DECK 2.0MM
GRAPHITE REAR UPPER DECK 2.0MM
GRAPHITE CENTER UPPER DECK 2.0MM
GRAPHITE REAR UPPER BRACE 2.0MM
BODY MOUNT, BATTERY MOUNT - V2 & WING SHIM (2)
BODY MOUNT - SHORT + SHIMS - SET
ALU MOTOR BULKHEAD
COMPOSITE CENTRAL BULKHEAD
SLIPPER CLUTCH SHAFT - HUDY SPRING STEEL™
ALU SLIPPER CLUTCH PLATE - 7075 T6 BLACK HARD COATED
SLIPPER CLUTCH PAD (2)
SLIPPER CLUTCH OUTDRIVE ADAPTER - HUDY SPRING STEEL™
SLIPPER CLUTCH SPRING C=45 - BLACK
➊
#365775
75T / 48
(OPTION)
#365778
78T / 48
(OPTION)
#365781
81T / 48 (STANDARD)
#365784
84T / 48
(OPTION)
36 4190
36 5781
ALU SLIPPER CLUTCH NUT
COMPOSITE SLIPPER CLUTCH SPUR GEAR 81T / 48 - GRAPHITE
90 1304
90 2305
90 2308
90 2318
90 3308
90 3310
94 1015
98 0212
98 1208
HEX SCREW SB M3x4 (10)
HEX SCREW SH M3x5 (10)
HEX SCREW SH M3x8 (10)
HEX SCREW SH M3x18 (10)
HEX SCREW SFH M3x8 (10)
HEX SCREW SFH M3x10 (10)
HIGH-SPEED BALL-BEARING 10x15x4 RUBBER SEALED (2)
PIN 2x11.6 (10)
PIN 2x8 (10)
DETAIL
➊
➋
980212
P 2x11.6
➋
➌
➌
➍
901304
➍
SB M3x4
CUTAWAY VIEW
VERY IMPORTANT!
It is absolutely imporant that you never fully tighten the Slipper Clutch. Overtightening the
Slipper Clutch may result in breakage of the diff crown gear and pinion gear.
NOTE ORIENTATION
902305
SH M3x5
➊
981208
P 2x8
➋
➌
0.5mm
SLIPPER ADJUSTMENT:
The Slipper Clutch is easily adjusted by the set-screw in the bushing. The more the spring is
tightened (bushing moved more inwards), the more the Slipper Clutch is tightened.
INITIAL INSTALLATION POSITION SHOWN
Detailed information on slipper adjustment can be found at the bottom of page 29.
27
SLIPPER CLUTCH ASSEMBLY
NOTE ORIENTATION
903310
SFH M3x10
TIGHTEN GENTLY
903310
SFH M3x10
902318
SH M3x18
OIL
941015
BB 10x15x4
28
NOTE ORIENTATION
OIL
BEARING OIL (HUDY #106230)
SLIPPER CLUTCH ASSEMBLY
SLIPPER CLUTCH ADJUSTMENT
The Slipper Clutch can be adjusted by loosening the set-screw and then, while keeping the
tool inside of the set-screw, rotating the spur gear by hand as indicated in the drawing.
➊ Untighten set-screw
➋ Adjust
➌ Tighten set-screw
To TIGHTEN: Rotate the spur gear in the counterclockwise (CCW) direction.
To LOOSEN: Rotate the spur gear in the clockwise (CW) direction.
IMPORTANT
TIGHTEN SLIPPER CLUTCH
When tightening the set-screw again, ensure that the set screw sits only
on the flat spot of the shaft.
➋ ADJUST
LOOSEN SLIPPER CLUTCH
NOTE ORIENTATION
Alle
ALTERNATIVE 1
ALTERNATIVE 2
WITH REAR TOP DECK (INITIAL SETTING)
WITHOUT REAR TOP DECK
n 1. 5
mm
903308
SFH M3x8
LONG
LONG
#306219 (3x6x2mm)
SHORT
902308
SHORT
ALTERNATIVE 1
ALTERNATIVE 2
WITH REAR TOP DECK (INITIAL SETTING)
WITHOUT REAR TOP DECK
SH M3x8
902310
3x10
3x10
3x10
3x10
SH M3x10
3x8
3x8
#361172
BAG
29
7. SHOCK ABSORBERS
PISTONS DETAIL
368010
2 holes 3 holes 6 holes 6 holes 6 holes 0 holes (Create custom holes)
(1.4mm) (1.3mm) (1.0mm) (1.1mm) (1.2mm) (0mm - use required drill pin)
965023
368030
368160
363240
902205
368120
970120
Thick Shim
Thick Shim
Thin Shim
306219
970080
368260
972030
2 holes 3 holes 6 holes 6 holes 6 holes 0 holes (Create custom holes)
(1.4mm) (1.3mm) (1.0mm) (1.1mm) (1.2mm) (0mm - use required drill pin)
368140
FRONT SPRINGS
#368174 PROGRESSIVE - 2 STRIPES (OPTION)
#368184 LINEAR - 2 DOTS
(OPTION)
#368185 LINEAR - 3 DOTS
(STANDARD)
REAR SPRINGS
#368273 PROGRESSIVE - 2 STRIPES (OPTION)
#368284 LINEAR - 1 DOT
(OPTION)
#368285 LINEAR - 2 DOTS
(STANDARD)
#368286 LINEAR - 3 DOTS
(OPTION)
BAG
30 6219
35 2460
36 3240
36 8010
36 8030
36 8040
36 8100
36 8120
36 8140
36 8160
36 8174
36 8184
36 8185
368040
368030
OPTIONAL:
#368051 ALU SHOCK CAP-NUT
WITH VENT HOLE (2)
352460
REAR SHOCK ABSORBERS COMPLETE SET (2)
ALU REAR SHOCK BODY - HARD COATED (2)
REAR HARDENED SHOCK SHAFT (2)
REAR SPRING-SET PROGRESSIVE - 2 STRIPES (2) (OPTION)
REAR SPRING-SET LINEAR - 1 DOT (2) (OPTION)
REAR SPRING-SET LINEAR - 2 DOTS (2)
REAR SPRING-SET LINEAR - 3 DOTS (2) (OPTION)
90 2205
96 5023
97 0080
97 0140
97 2030
HEX SCREW SH M2x5 (10)
E-CLIP 2.3 (10)
O-RING 8x1 (10)
O-RING 14 x 1.5 (10)
SILICONE O-RING 3x2 (10)
4x
➋
FRONT - SHORT
SHOCK ROD
2 holes (1.4mm)
368010
36 8200
36 8220
36 8260
36 8273
36 8284
36 8285
36 8286
There are two different thickness shims, use
them as shown. Use the same procedure when
building both front and rear shocks.
➊
O 3x2
These pistons can NOT
be used in shocks without
making the custom holes
by yourselves.
368285
C 2.3
972030
368185
OPTIONAL:
#368021 ALU SHOCK SPRING
RETAINING COLLAR (4)
COMPOSITE SET OF SERVO SHIMS (4)
PIVOT BALL 5.8 - V3 (10)
BALL UNIVERSAL 5.8MM WITH BACKSTOP (2)
COMPOSITE SHOCK PARTS
SHOCK PISTONS - COMPLETE SET - DERLIN
ALU SHOCK ADJUSTABLE NUT (2)
FRONT SHOCK ABSORBERS COMPLETE SET (2)
ALU FRONT SHOCK BODY - HARD COATED (2)
ALU LOWER SHOCK BODY CAP (2)
FRONT HARDENED SHOCK SHAFT (2)
FRONT SPRING-SET PROGRESSIVE - 2 STRIPES (2) (OPTION)
FRONT SPRING-SET LINEAR - 2 DOTS (2) (OPTION)
FRONT SPRING-SET LINEAR - 3 DOTS (2)
➌
965023
970140
368220
2x
THICK Shim
O-ring
THIN Shim
970080
O 8x1
INITIAL
PISTON
SETTING
O-ring
DETAIL
3 holes (1.3mm)
2x
➌
➊
➋
SHOCK DAMPING
SHOCK PISTONS
30
REAR - LONG
SHOCK ROD
CUTAWAY VIEW
SHOCK ABSORBERS
Downstop shim. THICKER shim used,
GREATER downstop is achieved.
306219
INITIAL SETTING
EXTREMELY
IMPORTANT
IMPORTANT
SHIM 3x6x1
Always use same shim thickness on right
and left side to achieve same downstop.
➋
➊ 3x6x1
SHORT
SHOCKS ROD
1mm 2mm 3mm
➋
➊ 3x6x1
2x
FRONT SHOCKS
LONG
SHOCKS ROD
SHORT
SHOCKS BODY
2x
INCORRECT
REAR SHOCKS
Do not push the shock rod straight
through the lower shock body
assembly; O-ring damage may result.
LONG
SHOCKS BODY
CORRECT
Twist the shock rod through
the lower shock body
assembly.
DETAIL
970140
970120
O 14x1.5
O 12x1
4x
4x
4x
INCORRECT
Grip the shock rod at top of
exposed threads with side
cutting pliers. Be careful not to
damage the shock rod.
1~1.5 mm
DEFAULT SHOCK REBOUND SETTING 0% (LOW REBOUND)
FRONT (SHORT)
2x Oil 550cSt
902205
CORRECT
INCORRECT
Follow the steps below to set the shock rebound to the default setting of 0%.
TIGHTEN FULLY
2x REAR (LONG)
Oil 450cSt
SH M2x5
3~5x
UP & DOWN
SHOCK OIL
➊
➋
➌
➍
➎
➏
Extend the shock shaft
completely. Fill the shock
body with the shock oil.
For the FRONT shocks
(short) use 550cSt oil. For
the REAR shocks (long)
use 450cSt oil.
Move the shock shaft up
and down a few times to
release the air bubbles
trapped beneath the
piston.
Orient the filled shock
vertically for several
minutes with the shock
shaft fully extended. The
remaining air bubbles
will release.
Gently place the shock cap onto the filled shock
body and start to tighten the cup. Tighten the
cap fully.
Gently push the shock
shaft completely into
the shock body. Excess
oil will flow through the
hole in the shock cap.
Keep the shock shaft
pushed in the shock
body and insert the
screw into the shock cap.
The rebound will be at
approximately 0%
31
SHOCK ABSORBERS
2x FRONT SHOCKS (SHORT)
2x REAR SHOCKS (LONG)
IMPORTANT
SHORT FRONT SHOCKS
Short Springs
2x
2x LONG REAR SHOCKS
Long Springs
Both FRONT SHOCKS must be the same overall length.
Both REAR SHOCKS must be the same overall length.
ALTERNATE SHOCK REBOUND SETTING (50% AND 100%)
The default shock rebound setting is 0% (as described on page 34).
Alternatively, you may set the shock rebound setting to 50% or 100% as described below. Remove the shock springs before performing shock rebound adjustment.
SETTING THE SHOCK REBOUND TO 50% (MEDIUM REBOUND)
REMOVE SHOCK CAP AND THE
SCREW FROM SHOCK CAP
TIGHTEN FULLY
50%
50%
➊
➋
➌
➍
➎
➏
Extend the shock shaft completely
and remove the shock cap and
remove screw from shock cap.
Fill the shock body with shock
oil up to the top. Make sure to
use same viscosity shock oil as
is in the shock.
Orient the filled shock
vertically for several minutes
with the shock shaft fully
extended. The remaining air
bubbles will release.
Gently place the shock cap
assembly onto the filled shock
body.
Push the shock shaft 50% into
the shock body. Excess oil will
bleed thgrough the hole in the
shock cap.
Keep the shock shaft pushed
50% into the shock body and
insert the screw into the shock
cap. The rebound will be at
approximately 50%.
SETTING THE SHOCK REBOUND TO 100% (HIGH REBOUND)
TIGHTEN FULLY
REMOVE SHOCK CAP
100%
32
➊
➋
➌
➍
Extend the shock shaft completely and remove
the shock cap.
Fill the shock body with shock oil up to the top.
Make sure to use same viscosity shock oil as is
in the shock.
Orient the filled shock vertically for several
minutes with the shock shaft fully extended. The
remaining air bubbles will release.
Gently place the shock cap assembly onto the filled
shock body. Keep the shock shaft extended 100% from
the shock body and tighten the shock cap completely.
The rebound will be at approximately 100%.
8. FINAL ASSEMBLY
902312
OPTIONAL:
#366220 INDEPENDENT SERVO MOUNT - SET
362290
366110
962030
LIPO BATTERY PACK
(NOT INCLUDED)
903308
RECEIVER
(NOT INCLUDED)
361320
366142
903310
366202
363510
306301
368045
903310
306310
960030
366200
SPEED CONTROLLER
(NOT INCLUDED)
STEERING SERVO
(NOT INCLUDED)
902308
903308
960030
302665
362650
309402
356200
366050
368200
352610
362650
309402
903310
SERVO SCREW
(NOT INCLUDED)
903310
902312
309402
369911
REAR TIRES
(NOT INCLUDED)
365718~23
(NOT INCLUDED)
902310
364090
368045
368100
902308
369910
361293
960240
MOTOR
(NOT INCLUDED)
BAG
960030
960030
902316
FRONT TIRES
(NOT INCLUDED)
10 7871 HUDY SELF-ADHESIVE FOAM STRIP (2)
30 2665 COMPOSITE BALL JOINT 4.9MM - CLOSED WITH HOLE (4)
30 6301 ANTENNA MOUNT - THIN
30 9402 BODY CLIP FOR 6MM BODY POST (4)
35 2610 ADJ. TURNBUCKLE M3 L/R 45 MM - SPRING STEEL™ (2)
35 6200 BRAKE/THROTTLE ARMS & STEERING SERVO ARMS - SET
36 1293 COMPOSITE CHASSIS WIRE COVER
36 1320 BODY MOUNT, BATTERY MOUNT - V2 & WING SHIM (2)
36 2290 STEEL STEERING BUSHING - SHORT (2)
36 2650 BALL END 4.9MM WITH THREAD 6MM (2)
36 4090 ALU ECCENTRIC MOTOR BULKHEAD INSERT
36 5718~23 ALU PINION GEAR HARD COATED 18~23T/48 (OPTION)
36 6050 COMPOSITE RADIO PLATE
36 6110 COMPOSITE BATTERY STRAP L+R
36 6142 COMPOSITE BATTERY HOLDER STAND (2)
36 6200 COMPOSITE SERVO MOUNT (2)
36 6202 COMPOSITE SERVO MOUNT - HIGHER
36 8045 STEEL SCREW SHOCK PIVOT BALL WITH HEX (2)
107871
90 2308
90 2310
90 2312
90 2316
90 3308
90 3310
96 0030
96 2030
96 0240
HEX SCREW SH M3x8 (10)
HEX SCREW SH M3x10 (10)
HEX SCREW SH M3x12 (10)
HEX SCREW SH M3x16 (10)
HEX SCREW SFH M3x8 (10)
HEX SCREW SFH M3x10 (10)
NUT M3 (10)
WASHER S 3x6x0.3 (10)
NUT M4 WITH SERRATED FLANGE (10)
36 8100 FRONT SHOCK ABSORBERS COMPLETE SET (2)
36 8200 REAR SHOCK ABSORBERS COMPLETE SET (2)
30 6310
36 3510
36 9702
36 9910
36 9911
ANTENNA (2)
LEXAN REAR WING (2)
XRAY XB4 BODY - WIDE
FRONT WHEELS AERODISK - WHITE (2)
REAR WHEELS AERODISK - WHITE (2)
33
FINAL ASSEMBLY
➋
INITIAL POSITION
960030
N M3
L=R
➊
➍
NOTE
ORIENTATION
902316
SH M3x16
➌
3x16
➋
INITIAL POSITION
960030
N M3
L=R
➊
➍
902312
SH M3x12
NOTE
ORIENTATION
➌
3x12
SERVO LINK
Adjust servo link to fit your servo.
6mm THREAD
RIGHT
THREAD
LEFT
THREAD
26mm
RIGHT THREAD
LEFT THREAD
6mm THREAD
NOTE ORIENTATION
SHORT
902308
SH M3x8
LONG
6mm THREAD
6mm THREAD
FROM SERVO
34
FINAL ASSEMBLY
NOTE ORIENTATION
REMOVE FRONT & CENTER
UPPER-DECK
903310
LONG
SFH M3x10
SHORT
VIEW OF RADIO PLATE
SPEED CONTROLLER
(NOT INCLUDED)
CA
903308
SFH M3x8
NOTE: In case the antenna tube does not hold the antenna properly,
apply a small drop of the CA glue to the outside end of the antenna
tube while inserting it into the holder. Make sure not to apply glue
to the inside of the antenna tube, or the antenna wire may get
permanently stuck.
Feed the receiver wire
into the antenna tube
903310
RECEIVER
(NOT INCLUDED)
CUT
SFH M3x10
DOUBLE-SIDED TAPE
(NOT INCLUDED)
VIEW OF RADIO PLATE
3x8
3x10
➌
902310
➋
NOTE
ORIENTATION
SH M3x10
➊
➊
➋
PINIONS
#365718
18T / 48P (OPTION)
#365719
19T / 48P (OPTION)
#365720
20T / 48P (OPTION)
#365721
21T / 48P (OPTION)
#365722
22T / 48P (OPTION)
#365723
23T / 48P (OPTION)
➊ Loosen the screw
➋ Insert motor into the bulkhead
35
FINAL ASSEMBLY
NOTE
ORIENTATION
Adjust the motor so the pinion meshes with the spur gear
properly. Make sure the gear mesh is not too tight.
There should be a small amount of play between the
teeth of the pinion gear and the spur gear.
➋
➊
➊ Adjust gear mesh
➋ Tighten the screw
➊
➊
LiPo BATTERY PACKS
(NOT INCLUDED)
902312
SH M3x12
0.3
3x6x
903310
SFH M3x10
Self-Adhesive Foam Strip
(#107871 HUDY)
962030
SHIM 3x6x0.3
CUT
DETAIL
902308
SH M3x8
Composite chassis electronic cover
is installed to ensure that wires are
not able to interfere with driveline
components.
36
FINAL ASSEMBLY
ASSEMBLY BACK FRONT & CENTER
UPPER-DECK
➊ Before cutting and making holes on the BODY, put the unpainted body on the
chassis to confirm the mounting position and location for holes and cutouts.
Before cutting and making holes on the WING, put the unpainted wing on the
wing holders to confirm the mounting position and location for holes and cutouts.
➋ Before painting, wash the inside of the body with mild detergent, and then rinse
and dry thoroughly.
➌ Mask all windows.
➍ Apply paint masks as appropriate.
➎ Paint the body using paints formulated for polycarbonate bodies.
➏ When the paint is dry, remove the masking.
➐ Carefully cut out the body using appropriate scissors or cutting tools.
➑ When you have finished cutting, peel off the external protective films.
BODY REAMER (HUDY #107600)
WING CUTTING LINE OPTIONS
INITIAL POSITION
LESS TRACTION
MORE TRACTION
LEXAN BODY
#369702 (STANDARD)
#369703 LIGHT (OPTION)
LEXAN REAR WING
#363510 1.0mm (STANDARD)
#363510 1.5mm (OPTION)
#363510 2.0mm (OPTION)
37
FINAL ASSEMBLY
960240
N M4
REAR WIDE WHEEL
FRONT NARROW WHEEL
903308
SFH M3x8
OPTIONAL WING SHIM
#293561
ALU REAR WING SHIM SILVER (OPTION)
#293561-O ALU REAR WING SHIM ORANGE (OPTION)
FINAL ASSEMBLY VIEW
38
MOTOR POSITION ALTERNATIVES
The XB4 can be assembled to fit either the saddle battery pack or short battery pack. Depending on the version you choose, you will need to follow different assembly instructions.
Saddle Pack Batteries (forward motor position):
Follow the assembly steps on pages 6-38.
Short Battery Pack (rearward motor position):
On pages 39-44, follow the alternative assembly methods for the designated steps.
FORWARD MOTOR POSITION
REARWARD MOTOR POSITION
SADDLE PACK BATTERIES
SHORT BATTERY PACK
REARWARD MOTOR POSITION / SHORT BATTERY PACK
INSTRUCTION MANUAL
In the kit you will find a separate Bag 09 which includes all specific parts to build the car with a Short Battery Pack (instead of with saddle pack batteries).
361167
361166
366114
960030
365425
961032
960030
903308
365424
903310
BAG
36 1166
36 1167
36 5424
36 5425
36 6114
GRAPHITE FRONT UPPER DECK 2.0MM - SHORT
GRAPHITE REAR UPPER DECK 2.0MM - LONG
CENTRAL DRIVE SHAFT 85MM - HUDY SPRING STEEL™
CENTRAL DRIVE SHAFT 95MM - HUDY SPRING STEEL™
COMPOSITE BATTERY STRAP - LONG
90 3308
90 3310
96 0030
96 1032
HEX SCREW SFH M3x8 (10)
HEX SCREW SFH M3x10 (10)
NUT M3 (10)
WASHER S 3.2 (10)
39
REARWARD MOTOR POSITION
PAGE 8 / STEP 1
CENTRAL DRIVE SHAFT (85MM) - LONGER
980210
P 2x10
➋
➌
BAG
➊
➍
GRAPHITE GREASE
(HUDY #106210)
PAGE 9 / STEP 2
902310
NOTE ORIENTATION - DIFF GEAR ON OPPOSITE SIDE
SH M3x10
REAR DIFF 8 000 cSt
PAGE 10 / STEP 1
CENTRAL DRIVE SHAFT (95MM) - SHORTER
980210
P 2x10
➋
➌
BAG
➊
➍
GRAPHITE GREASE
(HUDY #106210)
PAGE 11 / STEP 2
902310
SH M3x10
NOTE ORIENTATION - DIFF GEAR ON OPPOSITE SIDE
FRONT DIFF 8 000 cSt
40
REARWARD MOTOR POSITION
PAGE 23 / STEP 1
BAG
903308
SFH M3x8
903310
SFH M3x10
960030
N M3
961032
S 3.2
3x10
3x10
3x8
Use the position based
on the size of servo.
PAGE 26 / STEP 1
902310
SH M3x10
3x10
3x8
3x10
PAGE 26 / STEP 2
NOTE ORIENTATION
POSTS IN DIFFERENT POSITIONS
903310
SFH M3x10
303125
SHIM 3x6x3
SH 3x10
SH 3x10
SFH 3x10
SFH 3x10
41
REARWARD MOTOR POSITION
PAGE 28 / STEP 1
NOTE ORIENTATION - STAND IN DIFFERENT LOCATION
903310
SFH M3x10
PAGE 28 / STEP 2
TIGHTEN GENTLY
903310
SFH M3x10
NOTE ORIENTATION
902318
SH M3x18
PAGE 28 / STEP 3
OIL
NOTE ORIENTATION - SLIPPER CLUTCH DIRECTION IS REVERSED
OIL
941015
BB 10x15x4
42
BEARING OIL (HUDY #106230)
REARWARD MOTOR POSITION
PAGE 29 / STEP 3
BAG
3x10
3x10
902308
SH M3x8
BAG
902310
SH M3x10
3x8
PAGE 34 / STEP 4
NOTE ORIENTATION
LONG
902308
SH M3x8
SHORT
FROM SERVO
PAGE 35 / STEP 1
LONG
SHORT
NOTE ORIENTATION
903310
SFH M3x10
43
REARWARD MOTOR POSITION
PAGE 35 / STEP 3
➊ Loosen the screw
➋ Insert motor into the bulkhead
➊
➋
PAGE 35 / STEP 2
RECEIVER
(NOT INCLUDED)
SPEED CONTROLLER
(NOT INCLUDED)
903310
SFH M3x10
CA
NOTE: In case the antenna tube does not hold the antenna properly, apply
a small drop of the CA glue to the outside end of the antenna tube while
inserting it into the holder. Make sure not to apply glue to the inside of the
antenna tube, or the antenna wire may get permanently stuck.
Feed the receiver wire
into the antenna tube
DOUBLE-SIDED TAPE
(NOT INCLUDED)
PAGE 36 / STEP 2
902312
LiPo BATTERY PACK
(NOT INCLUDED)
SH M3x12
3x6x0.3
962030
SHIM 3x6x0.3
903310
SFH M3x10
44
CUT
Self-Adhesive Foam Strip
(#107871 HUDY)
FINAL ASSEMBLY VIEW
MULTI-FLEX™
You can adjust the chassis flex by adding or removing the screws in the center of the chassis. The less screws used
the softer the chassis flex will be. The more screws used the stiffer the chassis flex will be.
LESS SCREWS = SOFT FLEX SETTING
MORE SCREWS = STIFFER FLEX SETTING
IMPORTANT
Do not remove any other screw except those shown.
45
MAINTENANCE
SHOCK MAINTENANCE
The most important maintenance task for keeping consistent shock performance is refilling and bleeding them correctly. If built correctly, it will not be necessary to re-build them often. Replacing warped/hard
o-rings, scarred piston rods, or shaved/split/loose composite upper and lower ball joints are also important.
• For club racing, it is recommended to check the shocks for air inside before each race and only re-fill
and bleed them if necessary. Before each race day, make sure you take the spring off of each shock,
hold it up to your ear, and quickly compress the shock rod fully into the body while listening for any
air making a “whistling” or “squishy” sound as it passes through the piston holes. If you hear any
air, refill and bleed your shocks. For high-competition racing, it is recommended that the shocks be
re-filled and bled before a large event.
• If building or pairing new shocks, always make sure they are the same length using a shock
length measuring tool and adjust the lower ball joints as needed.
• During regular shock operation, oil naturally gets on the shock shaft and drop-by-drop slightly
gets out of the shock body. Shocks should be inspected regularly after each race, and oil replaced
as required.
BEARING MAINTENANCE
Ball-bearings in an off-road car must be properly maintained for smooth operation and long lifespan.
The XB4 ball-bearings are degreased and are lubricated with HUDY Bearing Oil. The following procedures are recommended to clean all of the bearings in your off-road car. For high-competition racing, we
recommended doing this every 3-4 weeks, or before a major race.
➊ Remove the seals on both sides of the bearing (if present). If the seals bend a little and you can see
a kink, carefully flatten the kink out by hand.
➏ Blow both sides of the bearing dry with compressed air to make sure particles come out.
➐ Hold the inner part of the bearing with my left thumb/forefinger and spin it to make sure it
➋ Spray the seals with motor cleaner and blow dry with compressed air.
spins free without any abnormal vibrations or sounds.
➌ Spray the bearing on both sides with motor cleaner.
➑ Place one drop of bearing oil into each side of the bearing.
➍ Spin the bearing while it is still wet to dislodge any particles with the cleaner.
➒ Replace both seals at the same time by lining them up on each side of the bearing and
lightly pressing them in all the way around the bearings circumference with your thumb and
forefinger. Do not press too hard or use any type of tool, such as a wrench tip, to push the
blue seals in as they will push in too far, bend and cause drag.
➎ Spray the bearing on both sides again.
If you spin test the bearing after you have re-oiled and sealed it, it will not spin freely for an extended
period of time. The lightest of oils may allow it to spin for 1-2 seconds. This is normal and once you
have mounted the bearings in the car again, the drive train will spin freely.
Make sure you use a motor cleaner that does not leave a residue after it dries as this may cause drag
and wear in the bearings.
RECOMMENDED PRODUCTS
• Use #106230 HUDY Bearing Oil to lubricate the bearings.
HUDY #106230
SUSPENSION & DRIVETRAIN MAINTENANCE
• Check suspension for free movement during building and operation, and especially after running
and if you have crashed the car. If the suspension does not move freely, use the appropriate HUDY
Arm Reamer to clean and resize the holes of the suspension arms.
• Regularly check the drive shaft pins (both side and center) and if they show any wear must be
immediately replaced by new pins. If the car is run with worn pins, excessive wear on the diff
outdrives will result. The 106000 HUDY Drive Pin Replacement Tool (for 3mm Pins) is a compact,
rugged multi-use tool set for replacing 3mm drive pins in drive shafts. Use the HUDY replacement
drive shaft pins 3x12 (#106051).
• Regularly inspect and replace the connecting pins which connect the center drive shafts with the
pinion gear, and also the pins that connect the wheel drive shafts with wheel axles. Use HUDY
Graphite Grease to lubricate the drive shaft connecting joints and the diff gears.
• Pivot balls and ball-joints will naturally wear for some time and will generate play. If there
is too much play the pivot balls and ball joints need to be replaced.
• If the car is run in wet conditions, apply WD-40® on all drivetrain parts before the run. After
the run, clean and dry the parts again.
HUDY #106210
HUDY SPRING STEEL™
The HUDY Spring Steel™ used in the car is the strongest and most durable steel material on the
RC market. While items made from HUDY Spring Steel™ are still subject to wear, the lifespan is
considerably longer than any other material. As parts made from HUDY Spring Steel™ wear, the
46
brown color will after some time “go down” but it will not affect the strength of the material.
The brown color is only a surface treatment and if the brown color will wear the durability of
the part will be still strong.
APPLIED
APPLIED
RACE
TRACK
NAME
COMPOSITE
ALU
DATE
LAPS
BEST LAP TIME
sec
FINAL POSITION
QUALIFYING POSITION
TRACK SIZE
OPEN
MEDIUM
TIGHT
TRACK TRACTION
HIGH
MEDIUM
LOW
TRACK SURFACE
CARPET
MEDIUM
BUMPY
SOFT DIRT
CLAY
BLUE GROOVE
ASTRO TURF
GRASS
TRACK CONDITION
DRY
MIDDLE
REAR
GEAR DIFF
BALL DIFF
GEAR DIFF
SLIPPER
GEAR DIFF
BALL DIFF
OIL
cSt
cSt
FRONT ROLL
CENTER
UP
DOWN
DOWNSTOP
3
2
1
2
1
0
OFFSET
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10 -11
-12
-13
CAMBER LINK
LOCATION
123
REAR ROLL
CENTER
UPRIGHT
COMPOSITE
ALU
1 2
1 2
HUB
REAR LOWER POSITION
SHOCK POSITION
#107704 SUPPORT BLOCKS
#107717 GAUGE
#107717 GAUGE
-11 -10
-13 -12
-9
-7
-8
-6
-5
-4
-3
-2
-1
CASTER
WING TYPE
COMPOSITE
ALU
9°
STANDARD
REAR
FRONT
CASTER BLOCK
6°
WING CUTTING LINE
SHOCK POSITION
REAR
FRONT
°
DOWNSTOP
0
mm
SHOCK TOWER
POSITION
CASTER
STANDARD
+0.75mm
- 0.75mm
OIL
3
12
FRONT LOWER
SHOCK POSITION
mm
DIFFERENTIAL TYPE
FRONT
OIL
LONGER BUSHINGS
MUD
WET
DUSTY
3 2
1
mm
21
HARD PACKED
SMOOTH
TRACK TYPE
UPPER SHOCK POSITION
SHIM
STEERING BLOCK
0
+
cSt
SATELLITE GEARS
COMPOSITE
STEEL
COMPOSITE
STEEL
COMPOSITE
STEEL
ALU
COMPOSITE
STEEL
OFFSET
COMPOSITE
STEEL
BUMP
STEER SHIM
CROWN GEAR
COMPOSITE
STEEL
IN FRONT OF ARM
cSt
OIL
BUMP STEER SHIM
cSt
SHIM UNDER STEERING PLATE
%
REBOUND
%
SERVO SAVER
mm
DOWNSTOP SHIM
mm
YES
UPSTOP TRAVEL ORING
PISTONS
NO
2 HOLES
3 HOLES
YES
NO
ø1.0mm
ø1.1mm
2 HOLES
ø1.2mm
3 HOLES
ACKERMANN
POSITION
2 1
mm
REAR TOE
°
IN
ARM SHIM
mm
FRONT TOP DECK
REAR TOP DECK
STANDARD
NO
STANDARD
NO
STEERING BRACE
NO
YES
6 HOLES
ø1.4mm
COMPOSITE
ALU
ARM SHIM
ø1.3mm
6 HOLES
SOFT
MEDIUM
TIGHT
ALU
BRASS
RR
RR
2+RR+2
mm
ACKERMANN PLATE
0mm
2mm
1°
0.5°
°
ALU
BRASS
RF
FR
2+RF+2
0.5°
0.5°
OUT
FRONT TOE
SPRINGS
ROLL
CENTER
ECCENTRIC
BUSHINGS
1°
T
SHOCKS
1°
0.5°
FR
FR
FR
SPUR GEAR
T
1°
FF
FFFF
GEARING
PINION
2mm
0mm
COMPOSITE
STEEL
PINION
STANDARD
+0.75mm
- 0.75mm
UPRIGHT WHEELBASE SHIM
mm
COMPOSITE
STEEL
ALU
ALU
-
CUSTOM PISTONS
ø
HOLES
mm
mm
ø
HOLES
FRONT CAMBER
ANTI ROLL BAR
THICKNESS
mm
°
mm
SHOCK PRELOAD
SHOCK PRELOAD
mm
°
REAR CAMBER
mm
FRONT ARM
TIRES
REAR ARM
STANDARD
STANDARD
TYPE
INSERTS
WHEELS
GRAPHITE ARM
STIFFENERS
ELECTRONICS
YES
MOTOR
SPEEDO
TIMING
BATTERIES
NO
mm
#107720 GAUGE
BALANCE
CHASSIS
g
ELECTRONICS LAYOUT
SERVO POSITION
LEFT
RIGHT
MOTOR POSITION
FRONT
REAR
CHASSIS FLEX
SPEEDO POSITION
LEFT
RIGHT
SCREW USED
RECEIVER POSITION
LEFT
RIGHT
SCREW NOT USED
SADDLE PACK
SHORT
BATTERY TYPE
RIDE HEIGHT
RIDE HEIGHT
mm
RIDE HEIGHT
GRAPHITE ARM
STIFFENERS
YES
NO
BALANCE
STANDARD
g
CHASSIS PLATE
YES
NO
SIDE GUARDS
COMMENTS
STANDARD
HARD
BALANCE
g
BALANCE
g
47
XB4’ SET-UP SHEET VER. 1.0 ©XRAY 2015
RC AMERICA, 2030 Century Center Blvd #15, Irving, TX 75062, USA
PHONE: 214-744-2400, FAX: 214-744-2401, xray@rcamerica.com
48
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