Xray XB4 User manual

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

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

4
SYMBOLS USED
EQUIPMENT REQUIRED
Transmitter Steering ServoReceiver
Lexan™ Paint Battery Charger Tires & Inserts
Bearing Oil
(HUDY #106230)
CA glue
Speed Controller LiPo Battery
Pinion Gear with Set-screw
Electric Motor &
Double-sided Tape
(HUDY #107875)
L=R
2x
CA
OIL
Part bags used Assemble left and
right sides the
same way
Assemble in the
specified order
Pay attention
here
Assemble as many
times as specified
(here twice)
Apply CA glue Apply oil
Optional
parts
TL
05
Tighten screw
gently
Completed
assembly
Detail
Apply
threadlock
Apply greaseScale Ensure smooth
non-binding
movement
1:1
DETAIL
Apply cleaner
ITEMS INCLUDED
HUDY Premium Silicone Oils HUDY Premium Silicone Oils HUDY Premium Silicone Oils Graphite Grease
(HUDY #106210)
Oil 500cSt (#106350) Oil 700cSt (#106370) Oil 10.000cSt (#106510)
Arm Reamer 3.0mm
TOOLS REQUIRED
Side Cutters
(HUDY #189010)
Turnbuckle Wrench
3mm (HUDY #181030)
Reamer (HUDY #107600) or (HUDY #107601)
Tweezer
Combination Pliers
(HUDY #189020)
HUDY TOOLS:
Scissors
(HUDY #188990)
3.0 mm
Special Tool for
turnbuckles, nuts
(HUDY #181090)
Socket 5.5mm
Socket 7.0mm
Allen 2.0mm
Allen 1.5mm
Pocket Hobby Knife
(HUDY #188981)
RC Shock-Plier Uni Tool
(HUDY #183011)

5
XB4 TECH TIPS
Fine sandpaper
Use fine sandpaper to
sand smooth the edges of
all graphite parts.
Apply CA glue to all edges
of the graphite parts.
DRIVE SHAFT PIN SERVICING
TIP
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.
To replace the worn pins use only
premium HUDY drive pins
(#106051 3.0mm dia x 10mm lenght)
(#106053 2.5mm dia x 10mm lenght)
GRAPHITE PARTS PREPARATION
TIP
Follow this Tech Tip to prepare the graphite parts. Sand the edges with sandpaper, and then seal the edges with CA glue to reinforce them and help prevent delamination.
Prepare all XB4 Graphite Parts:
• Front shock tower
• Rear shock tower
Do not use drive shafts
when the pins are worn.
Press out the worn pins.
Press in new pins and
regularly inspect for wear.
NOT INCLUDED
To ensure that you always have access to the most up-to-date version of the HUDY Set-up
Book, you can download it from the HUDY website 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.
XRAY offers wide range of optional tuning parts which are listed in tables
like these. Please refer to the exploded view of each main section to verify
which part is included in the kit while all other parts are available only as an
optional part and must be purchased separately.
Set-up Book
At the beginning of each section is an exploded view of the parts to be assembled.
There is also a list of all the parts and part numbers that are related to the assembly
of that section.
The part descriptions are color-coded to make it easier for you to identify the source
of a part. Here are what the different colors mean:
STYLE A - indicates parts that are included in the bag marked for the section.
STYLE B - indicates parts that are included in the box.
STYLE C - indicates parts that are already assembled from previous steps.
COLOR INDICATIONS
364900
361100
365884
SAMPLE OF OPTIONAL PARTS
#36XXXX TYPE OPTION 1
#36XXXX TYPE OPTION 2
#36XXXX TYPE INCLUDED
#36XXXX TYPE OPTION 3
For quick & easy drive pin replacements use
#106000 HUDY Drive Pin Replacement Tool
together with #106036 Ejector Pivot Pin &
Alternating Pivot 2.5mm.

6
BEVEL & SATELITTE GEARS + PINS
#304932 + #304980 GRAPHITE INCLUDED
#335030 + #335080 STEEL OPTION
1. FRONT & REAR DIFFERENTIAL
2x
2x
STEP DETAIL
STEP DETAIL
Use tweezers to
insert pin
➊
➊
➋
➋
➌
➌
➍
➍
➍
➎
➎
➎
➍➎
➍
304932 GRAPHITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4)
304980 COMPOSITE GEAR DIFF CROSS PIN
304990 DIFF GASKET (4)
364903 GEAR DIFFERENTIAL - LARGE VOLUME - SET
364912 COMPOSITE GEAR DIFFERENTIAL CASE - LARGE VOLUME
364920 COMPOSITE GEAR DIFFERENTIAL COVER - LARGE VOLUME
364940 STEEL DIFFERENTIAL BEVEL GEAR FOR LARGE VOLUME DIFF 40T
BAG
364962
364912
964050
964031
971050
364920
903258
364962
304932
304932
941014
981210
971050
964031
964031
964050
304990
364940
981210
941014
304932
304980
971050
O 5x1.5
971050
O 5x1.5
964050
S 5x15x0.3
964050
S 5x15x0.3
981210
P 2x10
981210
P 2x10
NOTE ORIENTATION
OIL
OIL
DETAIL
#106210 HUDY GRAPHITE GREASE
#106210 HUDY GRAPHITE GREASE
364962 GEAR DIFF OUTDRIVE ADAPTER FOR LARGE VOLUME DIFF (2)
903258 HEX SCREW SFH M2.5x8 (10)
941014 BALL-BEARING 10x15x4 RUBBER SEALED - GREASE (2)
964031 WASHER S 3.5x10x0.2 (10)
964050 WASHER S 5x15x0.3 (10)
971050 SILICONE O-RING 5x1.5 (10)
981210 PIN 2x10 (10)
NOTE ORIENTATION
#364912-G
GEAR DIFFERENTIAL CASE - LARGE
VOLUME - GRAPHITE
#364920-G
GEAR DIFFERENTIAL COVER - LARGE
VOLUME - GRAPHITE
#364941
STEEL DIFFERENTIAL BEVEL GEAR
FOR LARGE VOLUME DIFF 41T

7
DIFFERENTIAL OIL
Fill differential up to the top of the
diff cross-pins. 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:
➊ Put the diff (without oil) on the scale and check the
weight (approximately 11.47g)
➋ Slowly pour oil into the diff and watch the weight. Add
1.83g of oil into the diff. The approximate weight of the diff
including oil is 13.30g.
LOW TRACTION 7.000cSt (HUDY #106470)
MEDIUM-HIGH TRACTION 10.000cSt (HUDY #106510)
SUPER-HIGH TRACTION 15.000cSt (HUDY #106515)
NOTE:
Softer oil increases rear traction, harder oil increases on-power steering.
LOW TRACTION 7.000cSt (HUDY #106470)
MEDIUM-HIGH TRACTION 10.000cSt (HUDY #106510)
SUPER-HIGH TRACTION 15.000cSt (HUDY #106515)
NOTE:
Softer oil increases steering, harder oil increases stability.
TIPS FOR DIFFERENTIALS
REAR DIFERENTIALFRONT DIFERENTIAL
11.47g + 1.83g = 13.30g
#107865
HUDY Ultimate Digital Pocket
Scale 300g±0.01g
Tighten the screws equally but do NOT
tighten them completely.
Finish tightening in
this order.
g
1 1.47 g
13 30
10.000 cSt
1. FRONT & REAR DIFFERENTIAL
➊
➊
➋
➋
➌
➌
➍
➍
964031
S 3.5x10x0.2
903258
SFH M2.5x8
941014
BB 10x15x4
2x
2x 2x 2x
Rear diff
Silicone oil 10.000cSt
Fill just above the
cross-pins.
Front diff
Silicone oil 10.000cSt
Fill just above the
cross-pins.
OIL
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.
Use HUDY Ball-Bearing Grease
#106220 - STANDARD
#106221 - BLUE
#106222 - RED

8
2. REAR CENTRAL TRANSMISSION
#106210 HUDY GRAPHITE GREASE
#106213 HUDY JOINT GREASE - OPTION
MARKED “R“
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.
DRIVE SHAFT COLLAR
#365470 COMPOSITE INCLUDED
#365471-K ALU - BLACK OPTION
#365471-O ALU - ORANGE OPTION
➊
➋
➌
➍
362005 DIFF BULKHEAD BLOCK SET REAR - NARROW
363081 GRAPHITE SHOCK TOWER REAR 3.0MM - V2
365126 STEEL BEVEL DRIVE GEAR - CNC-MACHINED - 16T
365230 DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
365430 CENTRAL DRIVE SHAFT 108MM WITH 2.5MM PIN - HUDY SPRING STEEL™
365442 CENTRAL SHAFT UNIVERSAL JOINT
365470 COMPOSITE DRIVE SHAFT SAFETY COLLAR - V2 (3)
BAG
362005
902306
940815
940510
365442
365230
981208
902310
364903+364940
365126
362005
365470
980210
365430
363081
902310
980210
P 2x10
REAR BLOCK
IMPORTANT
CENTRAL DRIVE SHAFT (108 mm)
DETAIL
DRIVE SHAFT COLLAR
#365470 COMPOSITE INCLUDED
#365471-K ALU - BLACK OPTION
#365471-O ALU - ORANGE OPTION
XRAY BALL-BEARING
#359050 5x10x4 GREASE OPTION
#940510 5x10x4 OIL INCLUDED
#940814 8x14x4 GREASE OPTION
#940815 8x14x4 OIL INCLUDED
#363084
XB4 ALU REAR SHOCK TOWER 3.0MM - V2
902306 HEX SCREW SH M3x6 (10)
902310 HEX SCREW SH M3x10 (10)
940510 BALL-BEARING 5x10x4 RUBBER SEALED - OIL (2)
940815 BALL-BEARING 8x14x4 RUBBER SEALED - OIL (2)
980210 PIN 2x10 (10)
981208 PIN 2x8 (10)
364903 GEAR DIFFERENTIAL - LARGE VOLUME - SET
364940 STEEL DIFFERENTIAL BEVEL GEAR FOR LARGE VOLUME DIFF 40T

9
2. REAR CENTRAL TRANSMISSION
➊
➋
➌
➍
➎
➏
Bearing with BLUE
rubber covers
Follow the TECH TIP on page 5
to prepare graphite parts
940510
BB 5x10x4
940815
BB 8x14x4
902310
SH M3x10
902306
SH M3x6
902310
SH M3x10
THREAD LOCK
8x14x4mm
OIL
GRAPHITE GREASE
(HUDY #106210)
NOTE ORIENTATION
ALTERNATIVE 1 ALTERNATIVE 2
Rear shock tower mounted from the FRONT
INITIAL SETTING
Rear shock tower mounted from the REAR
Cut the edge on both sides
IMPORTANT
REAR BLOCK
IMPORTANT
DETAIL
REAR DIFF 10.000 cSt
NOTE ORIENTATION
DETAIL
981208
P 2x8
Bearing Oil
(HUDY #106230)
5x10x4mm
OIL
Bearing Oil
(HUDY #106230)
#363084
XB4 ALU REAR SHOCK TOWER 3.0MM - V2
XRAY BALL-BEARING
#359050 5x10x4 GREASE OPTION
#940510 5x10x4 OIL INCLUDED
#940814 8x14x4 GREASE OPTION
#940815 8x14x4 OIL INCLUDED

10
2. FRONT CENTRAL TRANSMISSION
MARKED “F“
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.
#106210 HUDY GRAPHITE GREASE
#106213 HUDY JOINT GREASE - OPTION
DRIVE SHAFT COLLAR
#365470 COMPOSITE INCLUDED
#365471-K ALU - BLACK OPTION
#365471-O ALU - ORANGE OPTION
DRIVE SHAFT COLLAR
#365470 COMPOSITE INCLUDED
#365471-K ALU - BLACK OPTION
#365471-O ALU - ORANGE OPTION
XRAY BALL-BEARING
#359050 5x10x4 GREASE OPTION
#940510 5x10x4 OIL INCLUDED
#940814 8x14x4 GREASE OPTION
#940815 8x14x4 OIL INCLUDED
➊
➋➌
➍
325324 DRIVE SHAFT 75MM WITH 2.5MM PIN - HUDY SPRING STEEL™
362004 DIFF BULKHEAD BLOCK SET FRONT - NARROW
362083 GRAPHITE SHOCK TOWER FRONT 3.5MM
365126 STEEL BEVEL DRIVE GEAR - CNC-MACHINED - 16T
365230 DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
365442 CENTRAL SHAFT UNIVERSAL JOINT
365470 COMPOSITE DRIVE SHAFT SAFETY COLLAR - V2 (3)
902306 HEX SCREW SH M3x6 (10)
902310 HEX SCREW SH M3x10 (10)
940510 BALL-BEARING 5x10x4 RUBBER SEALED - OIL (2)
940815 BALL-BEARING 8x14x4 RUBBER SEALED - OIL (2)
980210 PIN 2x10 (10)
981208 PIN 2x8 (10)
364903 GEAR DIFFERENTIAL - LARGE VOLUME - SET
364940 STEEL DIFFERENTIAL BEVEL GEAR FOR LARGE VOLUME DIFF 40T
BAG
365230
365470
981208
362004
940815
902306
362083
902310
902310
325324
980210
365442
940510
365126
FRONT BLOCK
362004
IMPORTANT
980210
P 2x10
CENTRAL DRIVE SHAFT (75mm)
DETAIL
364903+364940
#362085
XB4 ALU FRONT SHOCK TOWER 3.0MM

11
2. FRONT CENTRAL TRANSMISSION
➊
➋
➌
➍
➎
Bearing with BLUE
rubber covers
Follow the TECH TIP on page 5
to prepare graphite parts
940510
BB 5x10x4
940815
BB 8x14x4
902310
SH M3x10
902310
SH M3x10 NOTE ORIENTATION
THREAD LOCK
NOTE ORIENTATION
NOTE ORIENTATION
DETAIL
FRONT BLOCK
IMPORTANT
DETAIL
FRONT DIFF 10.000 cSt
5x10x4mm
OIL
8x14x4mm
OIL
981208
P 2x8
Bearing Oil
(HUDY #106230)
Bearing Oil
(HUDY #106230)
XRAY BALL-BEARING
#359050 5x10x4 GREASE OPTION
#940510 5x10x4 OIL INCLUDED
#940814 8x14x4 GREASE OPTION
#940815 8x14x4 OIL INCLUDED
902306
SH M3x6
GRAPHITE GREASE
(HUDY #106210)
#362085
XB4 ALU FRONT SHOCK TOWER 3.0MM

12
3. REAR SUSPENSION
363112-H
363112-H
363122-H
363324
367210
362315
362478
363315
903312
901304
362005
903312
362315
902308
363122-H
901303
303431-K
303454
901308
303454
303431-K ALU 4.9MM BALL END - BLACK (2)
303454 BALL JOINT 4.9MM - OPEN (4)
362005 DIFF BULKHEAD BLOCK SET REAR - NARROW
362315 ECCENTRIC BUSHING SET (2)
362478 ANTI-ROLL BAR 1.8 MM
363112-H COMPOSITE SUSPENSION ARM REAR LOWER RIGHT - HARD
363122-H COMPOSITE SUSPENSION ARM REAR LOWER LEFT - HARD
363315 ALU LOWER SUSP. HOLDER 1° REAR-FRONT - NARROW - 7075 T6
363324 ALU LOWER SUSP. HOLDER REAR-REAR - NARROW - 7075 T6
367210 SUSPENSION PIVOT PIN (2)
BAG
Remove the 3x6.5x2mm shim from each rear arm.
ANTI-ROLL BARS
#362470 1.0mm
OPTION
#362471 1.1mm OPTION
#362472 1.2mm OPTION
#362473 1.3mm OPTION
#362474 1.4mm OPTION
#362476 1.6mm OPTION
#362478 1.8mm INCLUDED
#362480 2.0mm OPTION
901303 HEX SCREW SB M3x3 (10)
901304 HEX SCREW SB M3x4 (10)
901308 HEX SCREW SB M3x8 (10)
902308 HEX SCREW SH M3x8 (10)
903312 HEX SCREW SFH M3x12 (10))
#363314
ALU LOWER SUSP.
HOLDER 3° REAR-FRONT
NARROW - 7075 T6 1-DOT
3°
SHORT REAR SUSPENSION ARM
#363112-H RIGHT HARD INCLUDED
#363122-H LEFT HARD INCLUDED
#363112-G RIGHT GRAPHITE OPTION
#363122-G LEFT GRAPHITE OPTION
LONG REAR SUSPENSION ARM
#363113-H RIGHT HARD OPTION
#363123-H LEFT HARD OPTION
#363113-G RIGHT GRAPHITE OPTION
#363123-G LEFT GRAPHITE OPTION

13
TOE-IN
ANTI-SQUAT
ROLL CENTER
TRACK-WIDTH
3. REAR SUSPENSION
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).
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.
The track-width is directly influenced by the size of
the wheels and tires used.
ANTI-SQUAT ROLL CENTER TRACK-WIDTH TOE-IN
RR RR RR RRRF RF RF RF(°) (mm) (mm) (°)
=2°
=3°
=1°
=3°
=2°
=4°
=1°
=2°
=0°
=1°
=2°
=0°
=2°
=1°
=-1°
=2°
=3°
=1°
=
+1.5mm
= 0mm
=
-1.5mm
=
+0.75mm
= 0mm
=
-0.75mm
➊
Marked “L”
Marked “R”
2mm
from rear arm
2mm
from rear arm
Arm Reamer 3.0mm (HUDY #107633)
If the suspension arm does not move freely
use a HUDY Arm Reamer to size the holes
of the arms.
➊
➋
➌
➌
➍
➍
RR 1°
RF
903312
SFH M3x12
From Rear Arm
SHIM 3x6.5x2 REAR BLOCK
IMPORTANT
DETAIL
Check for free movement
DETAIL
Composite eccentric bushings
0.5°
1°
INITIAL SETTING
Composite eccentric bushings
0.5°
1°
INITIAL SETTING
SHORT REAR SUSPENSION ARM
#363112-H RIGHT HARD INCLUDED
#363122-H LEFT HARD INCLUDED
#363112-G RIGHT GRAPHITE OPTION
#363122-G LEFT GRAPHITE OPTION
LONG REAR SUSPENSION ARM
#363113-H RIGHT HARD OPTION
#363123-H LEFT HARD OPTION
#363113-G RIGHT GRAPHITE OPTION
#363123-G LEFT GRAPHITE OPTION
For SHORT arms do not use INNER
positions.
For LONG arms do not use OUTER
positions.
0.5°
1°
0.5°
1°
For SHORT arms use only OUTER
positions.
For LONG arms use only INNER
positions.
#363314
ALU LOWER SUSP.
HOLDER 3° REAR-FRONT
NARROW - 7075 T6 1-DOT
3°

14
3. REAR SUSPENSION
ANTI-ROLL BAR
➊
➋
➌
3x4mm
3x8mm
3x3mm
L=R
2x
1.5mm
4mm
L=R
0mm
STEP DETAIL
➌
Step check for free movement
➊
Loosen the 3x4 setscrew if
the anti-roll bar does not
turn freely
Step
➊
901308
SB M3x8
901303
SB M3x3
901304
SB M3x4
902308
SH M3x8
DETAIL
DETAIL
DETAILDETAIL
ANTI-ROLL BARS
#362470 1.0mm
OPTION
#362471 1.1mm OPTION
#362472 1.2mm OPTION
#362473 1.3mm OPTION
#362474 1.4mm OPTION
#362476 1.6mm OPTION
#362478 1.8mm INCLUDED
#362480 2.0mm OPTION

15
Remove the 3x6.5x2mm shim from each front arm.
3. FRONT SUSPENSION
303431-K ALU 4.9MM BALL END - BLACK (2)
303454 BALL JOINT 4.9MM - OPEN (4)
361201 COMPOSITE FRONT BUMPER - ONE HOLE
362004 DIFF BULKHEAD BLOCK SET FRONT - NARROW
362112-H COMPOSITE SUSPENSION ARM FRONT LOWER - HARD
362312 ALU LOWER SUSP. HOLDER FRONT-FRONT - NARROW - 7075 T6
362315 ECCENTRIC BUSHING SET (2)
362322 ALU LOWER SUSP. HOLDER FRONT-REAR - NARROW - 7075 T6
362478 ANTI-ROLL BAR 1.8 MM
367210 SUSPENSION PIVOT PIN (2)
901303 HEX SCREW SB M3x3 (10)
901304 HEX SCREW SB M3x4 (10)
901308 HEX SCREW SB M3x8 (10)
902308 HEX SCREW SH M3x8 (10)
903312 HEX SCREW SFH M3x12 (10))
303431-K
362322
362315
362312
903312
361201 902308
362112-H
903312
367210
362112-H
901304
902308
362004
362315
303454
901308
303454
901303
BAG
ANTI-ROLL BARS
#362470 1.0mm
OPTION
#362471 1.1mm OPTION
#362472 1.2mm OPTION
#362473 1.3mm OPTION
#362474 1.4mm OPTION
#362476 1.6mm OPTION
#362478 1.8mm INCLUDED
#362480 2.0mm OPTION
362478
SHORT FRONT SUSPENSION ARM
#362112 MEDIUM OPTION
#362112-H HARD INCLUDED
#362112-G GRAPHITE OPTION
LONG FRONT SUSPENSION ARM
#362113-H HARD OPTION
#362113-G GRAPHITE OPTION

16
3. FRONT SUSPENSION
KICK UP
ROLL CENTER
TRACK-WIDTH
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.
The track-width is directly influenced by the size of the
wheels and tires used.
KICK-UP TRACK-WIDTHROLL CENTER
FF FFFF FR FRFR (°) (mm) (mm)
=7°
=6°
=8°
=6°
=5°
=7°
=8°
=7°
=9°
=
+0.75mm
= 0mm
= - 0.75mm
=
+1.5mm
= 0mm
= - 1.5mm
KICK-UP
C-HUB CASTER 6° 7° 8° 9° 10°
6° 12° 13° 14° 15° 16°
9° 15° 16° 17° 18° 19°
Caster is the angle between the steering pivot
axis and the vertical plane. Caster is affected not
only by the C-Hub caster, but also by the front
kick-up angle relative to the flat chassis bottom.
The table indicates how kick up angle effects
total caster.
The XB4’s stock caster blocks are 9°, but 6°
blocks are available as an option.
TOTAL CASTER = C-HUB CASTER+KICK UP
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).
➊
➊
➋
➌
➌
➍
➍
903312
SFH M3x12
If the suspension arm does not move freely use a
HUDY Arm Reamer to size the holes of the arms
Arm Reamer 3.0mm (HUDY #107633)
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.
FRONT ARM
L=R
2mm
from front arm
2mm
from front arm
From Front Arm
SHIM 3x6.5x2 FRONT BLOCK
IMPORTANT
DETAIL
Composite eccentric bushings
0.5°
1°
INITIAL SETTING
0.5°
1°
INITIAL SETTING
Composite eccentric bushings
For SHORT arms do not use INNER
positions.
For LONG arms do not use OUTER
positions.
0.5°
1°
0.5°
1°
For SHORT arms use only OUTER
positions.
For LONG arms use only INNER
positions.
SHORT FRONT SUSPENSION ARM
#362112 MEDIUM OPTION
#362112-H HARD INCLUDED
#362112-G GRAPHITE OPTION
LONG FRONT SUSPENSION ARM
#362113-H HARD OPTION
#362113-G GRAPHITE OPTION
Check for free movement
DETAIL

17
3. FRONT SUSPENSION
ANTI-ROLL BAR
L=R
2x
1.5mm
4mm
➊
➋
➌
L=R
0mm
STEP DETAIL
➌
Step check for free movement
➊
Loosen the 3x4 setscrew if
the anti-roll bar does not
turn freely
Step
➊
3x4mm
3x3mm
3x8mm
901308
SB M3x8
901303
SB M3x3
901304
SB M3x4
902308
SH M3x8
902308
SH M3x8
DETAIL
DETAIL
DETAIL
DETAIL
ANTI-ROLL BARS
#362470 1.0mm
OPTION
#362471 1.1mm OPTION
#362472 1.2mm OPTION
#362473 1.3mm OPTION
#362474 1.4mm OPTION
#362476 1.6mm OPTION
#362478 1.8mm INCLUDED
#362480 2.0mm OPTION

18
ALU CONICAL SHIM
#362280 SILVER INCLUDED
#362280-K BLACK OPTION
#362280-O ORANGE OPTION
4. REAR TRANSMISSION
302665 COMPOSITE BALL JOINT 4.9MM - CLOSED WITH HOLE (4)
303123 ALU SHIM 3x6x2.0MM (10)
306219 CCOMPOSITE SET OF SERVO SHIMS (4)
322610 ADJ. TURNBUCKLE M3 L/R 55 MM - SPRING STEEL (2)
323354-H COMPOSITE UPRIGHT REAR - HARD
323382 ALU REAR HUB PLATE FOR MULTI ADJ. UPRIGHT - 1-HOLE
325324 REAR DRIVE SHAFT 75MM WITH 2.5MM PIN - SPRING STEEL™
325340 REAR DRIVE AXLE LB - HUDY SPRING STEEL™
327210 FRONT SUSPENSION PIVOT PIN (2)
362280 ALU CONICAL SHIM 3x6x2.0MM (10)
362316 OPEN ECCENTRIC BUSHING SET (2)
362651 BALL END 4.9MM WITH THREAD 8MM (2)
363520 REAR WING POST - V2 (2)
BAG
365230 DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
365353 ALU WHEEL HUB 12MM (2)
902205 HEX SCREW SH M2x5 (10)
902254 HEX SCREW SH M2.5x4 (10)
902310 HEX SCREW SH M3x10 (10)
902312 HEX SCREW SH M3x12 (10)
940513 BALL-BEARING 5x12x4 RUBBER SEALED - GREASE (2)
941014 BALL-BEARING 10x15x4 RUBBER SEALED - GREASE (2)
960030 NUT M3 (10)
980210 PIN 2x10 (10)
902310
365230
325324
325340
941014
902312
302665
322610
940513
365353
362651
362280
303123
960030
362651 363520
323382
908210
303123
980210
302665
902205
323354-H
306219
306219
327210
362316
902254
REAR UPRIGHTS
#323354-H COMPOSITE - H INCLUDED
#323354-G COMPOSITE - G OPTION
#323355 ALU OPTION
XRAY BALL-BEARING
#940512 5x12x4 OIL OPTION
#941015 10x15x4 OIL OPTION
#940513 5x12x4 GREASE INCLUDED
#941014 10x15x4 GREASE INCLUDED
WHEEL HUBS 14MM
#365352 +0.75mm OPTION
#365350 0mm OPTION
#365351 -0.75mm OPTION
#323381
ALU REAR HUB PLATE FOR MULTI ADJUSTABLE UPRIGHT
- SWISS 7075 T6
#325341 REAR ADJUSTABLE DRIVE AXLE LB - HUDY SPRING STEEL™
# 325390 ALU SHIM 10x12x2MM (2)
WHEEL HUBS 12MM
#365360 +4.5mm - (6 slots) OPTION
#365359 +3.75mm (5 slots) OPTION
#365358 +3.0mm (4 slots) OPTION
#365357 +2.25mm (3 slots) OPTION
#365356 +1.5mm (2 slots) OPTION
#365355 +0.75mm (1 slot) OPTION
#365353 0mm (0 slots) INCLUDED
#365354 -0.75mm (Lightw.) OPTION
#365361 -1.25mm (Lightw.) OPTION
ALU NUTS M3
#296530-B BLUE OPTION
#296530-K BLACK OPTION
#296530-O ORANGE OPTION
#960031 SILVER INCLUDED
DRIVE SHAFT
#325323 71mm OPTION
#325326 73mm OPTION
#325324 75mm INCLUDED

19
4. REAR TRANSMISSION
INITIAL SETTING
ALTERNATIVE ORIENTATION
L=R
INITIAL SETTING
L=R
INITIAL SETTING
902312
SH M3x12
NOTE ORIENTATION
2x
2x
L=R
L=R
LONG AXLE
➊
➍
➎
➏
➐
➑
➋
➌
940513
BB 5x12x4
902205
SH M2x5
980210
P 2x10
10x15x4mm
5x12x4mm
DRIVE SHAFT (75mm)
#106210 HUDY GRAPHITE GREASE
#106213 HUDY JOINT GREASE - OPTION
REAR UPRIGHTS
#323354-H HARD INCLUDED
#323354-G GRAPHITE OPTION
#323355 ALU OPTION
941014
BB 10x15x4 Use HUDY Ball-Bearing Grease
#106220 - STANDARD
#106221 - BLUE
#106222 - RED
XRAY BALL-BEARING
#940512 5x12x4 OIL OPTION
#941015 10x15x4 OIL OPTION
#940513 5x12x4 GREASE INCLUDED
#941014 10x15x4 GREASE INCLUDED
Bearing with BLACK
rubber covers
#323381
ALU REAR HUB PLATE FOR MULTI
ADJUSTABLE UPRIGHT - SWISS 7075 T6
303123
SHIM 3x6x2
3x6x2mm
OPTIONAL HEX HUB EFFECTS
Different offset hex hubs are used to increase or
decrease the track-width.
LESS OFFSET
Rear - more traction
Front - more steering
MORE OFFSET
Rear - less traction
Front - less steering
WHEEL HUBS 12MM
#365360 +4.5mm - (6 slots) OPTION
#365359 +3.75mm (5 slots) OPTION
#365358 +3.0mm (4 slots) OPTION
#365357 +2.25mm (3 slots) OPTION
#365356 +1.5mm (2 slots) OPTION
#365355 +0.75mm (1 slot) OPTION
#365353 0mm (0 slots) INCLUDED
#365354 -0.75mm (Lightw.) OPTION
#365361 -1.25mm (Lightw.) OPTION
WHEEL HUBS 14MM
#365352 +0.75mm OPTION
#365350 0mm OPTION
#365351 -0.75mm OPTION
DRIVE SHAFT
#325323 71mm OPTION
#325326 73mm OPTION
#325324 75mm INCLUDED

20
CAMBER
ROLL CENTER
WHEELBASE
4. REAR TRANSMISSION
902254
SH M2.5x4
Ensure that the rear upright
moves freely. If it does not move
freely, use sandpaper to thin both
wheelbase adjustment shims.
2mm
1mm
306219
SHIM 3x6x2
306219
SHIM 3x6x1
TIGHTEN
GENTLY
TIGHTEN GENTLY
Adjustment Shim BEHIND HUB moves hub forward.
SHORTER WHEELBASE
ARM
Check for free
movement
DETAIL
Adjustment Shim IN FRONT OF HUB moves hub
rearward.
LONGER WHEELBASE
ARM
37mm
2x
L=R
8mm THREAD
8mm THREAD
THREAD
THREAD
Install the pivot balls with Professional
Multi Tool (HUDY #183011)
362280
CON. SHIM 3x6x2
L=R
DETAIL
INITIAL SETTING
2mm
ALU CONICAL SHIM
#362280 SILVER INCLUDED
#362280-K BLACK OPTION
#362280-O ORANGE OPTION
2x
L=R
NOTE ORIENTATION
2x
2x
L=R
L=R
NOTE
ORIENTATION
NOTE
ORIENTATION
960030
N M3
902310
SH M3x10
303123
SHIM 3x6x2
CONICAL SHIM 2mm