Xray T4 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
NOT INCLUDED
To ensure that you always have access to the most up-to-date version
of the XRAY Set-up Book, XRAY will now be offering only the digital
online version on our website www.teamxray.com. 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.
TOOLS REQUIRED
Side Cutters
(HUDY #189010)
Turnbuckle Wrench
4mm (HUDY #181040)
Reamer
(HUDY #107600) or
(HUDY #107601)
Combination Pliers
(HUDY #189020)
HUDY TOOLS:
Scissors
(HUDY #188990)
4.0 mm
3.0 mm
Socket: 5.5mm Socket: 7.0mmAllen: 1.5mm Allen: 2.0mm Allen: 3.0mm
Pocket Hobby Knife
(HUDY #188981)
RC Shock-Plier Uni Tool
(HUDY #183011)
Arm Reamer 3.0mm Turnbuckle Wrench
3mm (HUDY #181030)
Snap Ring Pliers
SYMBOLS USED
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
EQUIPMENT REQUIRED
ITEMS INCLUDED
Apply oil
Optional
parts
Premium Silicone Oil
450cSt (HUDY #106345)
450cSt
5.000cSt
Premium Silicone Oil
5.000cSt (HUDY #106450)
TL
05
Tighten screw
gently
Completed
assembly
Detail view
Apply thread
lock
Apply greaseScale Ensure smooth
non-binding
movement
Graphite Grease
(HUDY #106210)
Follow Set-up Book
FRONT & REAR AXLES
SAMPLE OF
OPTIONAL PARTS
#30XXXX OPTION 1
#30XXXX OPTION 2
#30XXXX OPTION 3
1:1
DETAIL
Pinion Gear and Setscrew
Transmitter Steering ServoReceiver Bearing Oil
(HUDY #106230) Speed Controller
Electric Motor &
Lexan™ Paint Battery Charger Wheels & Tires & Inserts
(HUDY #803053 C3-28)
(HUDY #803062 A1-36)
LiPo Battery190mm Bodyshell Fibre Tape
(HUDY #107870)
Double-sided Tape
(HUDY #107875)

5
CA
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.
CHASSIS PREPARATION
COLOR INDICATIONS
CA
CA
To protect and seal edges of graphite parts, sand edges smooth and then apply CA glue.
Do this for: chassis edges, countersunk holes, and shock towers.
Apply only a bit of CA glue in the countersunk holes.
Apply only a bit of CA glue in the countersunk holes.

6
1. GEAR DIFFERENTIAL & FRONT SOLID AXLE
Use tweezers to
insert pin.
981210
P 2x10
981210
P 2x10
972050
O 5x2
972050
O 5x2
964050
S 5x15x0.3
964050
S 5x15x0.3
➊
➋
➌
➍
➍➍
➎
➎
➊
➋
➌
➍
➎
DETAIL
➎
STEP
STEP DETAIL
304900 XRAY GEAR DIFFERENTIAL - SET
304910 COMPOSITE GEAR DIFF. CASE & COVER
304930 COMPOSITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4)
304970 ALU GEAR DIFF OUTDRIVE ADAPTER - 7075 T6 (2)
304980 COMPOSITE GEAR DIFF CROSS PIN
304990 DIFF GASKET (4)
305135 COMPOSITE SOLID AXLE DRIVESHAFT ADAPTERS (2)
305188 COMPOSITE SOLID AXLE 38T - SET
902310 HEX SCREW SH M3x10 (10)
903256 HEX SCREW SFH M2.5x6 (10)
941015 BALL-BEARING 10x15x4 RUBBER SEALED - OIL (2)
964031 WASHER S 3.5x10x0.2 (10)
964050 WASHER S 5x15x0.3 (10)
971240 SILICONE O-RING 24x0.7 (10)
972050 SILICONE O-RING 5x2 (10)
981210 PIN 2x10 (10)
GEAR DIFFERENTIAL
➍
NOTE
ORIENTATION
#304971
HUDY SPRING STEEL™ OUTDRIVES
#304971
HUDY SPRING STEEL™ OUTDRIVES
BAG
304970
304910
964050
972050
304990
304910
903256
981210
981210
304970
941015
971240
972050
964031
304980
304930
304930
941015
#305137
STEEL SOLID AXLE DRIVESHAFT ADAPTERS
HUDY SPRING STEEL™
#305136
ALU SOLID DRIVESHAFT ADAPTERS
305188
941015
941015
305135
902310
305135
305188
902310
COMPOSITE SOLID AXLE
CUTAWAY VIEW
#304932
GRAPHITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4)
#304932
GRAPHITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4)
DETAIL
#309002
SET OF CERAMIC BALL-BEARINGS (14)

7
964031
S 3.5x10x0.2
1. GEAR DIFFERENTIAL & FRONT SOLID AXLE
1. GEAR DIFFERENTIAL & FRONT SOLID AXLE
971240
O 24x0.7
After disassembling the gear diff the large O-ring may have an increased size and
may be more difficult to re-install. We recommend either inserting the old O-ring
carefully in the diff cover, or replacing the old O-ring with a new O-ring if the old
one cannot be made to fit properly.
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:
NOTE
SOFTER oil increases rear traction, HARDER oil increases on-power steering and
stability. It is important not to use soft oils in high-traction conditions as this would
not increase traction, but would make the car loose as the car would become too
twitchy.
However, if the oil is too soft, it could generate the same effect like the car has no
traction. Therefore it is very important to choose the correct oil very carefully. We
recommend using softer oil first, then try harder oil to better understand the effect
on the car’s behavior at the track. Choose the oil accordingly.
TIPS FOR FRONT DIFFERENTIAL
To increase on-power steering and cornering speed, the gear diff can also be used in the front.
NOTE: If you use the gear diff in the front, we recommend using optional #304971 HUDY
Spring Steel™ outdrives because the stress on the outdrives in the front is much higher
than in the rear.
USE THESE OILS FOR FRONT DIFFERENTIAL
500.000cSt (HUDY #106650)
1 000.000cSt (HUDY #106692)
2 000.000cSt (HUDY #106694)
To make the front differential tighter, you can use cleaning gum instead of oil.
IMPORTANT!
Using cleaning gum instead of oil in the gear differential can lead to gear breakage because
the gears are working under dry conditions.
LOW TRACTION
1.000cSt (HUDY #106410)
2.000cSt (HUDY #106420)
TIPS FOR DIFFERENTIALS
7.90g 9.40g
#107865
HUDY Ultimate Digital Pocket
Scale 300g±0.01g
INITIAL SETTING
5.000cSt
MEDIUM TRACTION
2.000cSt (HUDY #106420)
3.000cSt (HUDY #106430)
4.000cSt (HUDY #106440)
5.000cSt (HUDY #106450)
HIGH TRACTION
5.000cSt (HUDY #106450)
6.000cSt (HUDY #106460)
7.000cSt (HUDY #106470)
8.000cSt (HUDY #106480)
9.000cSt (HUDY #106490)
10.000cSt (HUDY #106510)
SUPER-HIGH TRACTION
10.000cSt (HUDY #106510)
15.000cSt (HUDY #106515)
20.000cSt (HUDY #106520)
➊ Put the diff (without oil) on the scale and check the
weight (approximately 7.90g)
➋ Slowly pour oil into the diff and watch the weight. Add 1.5g of oil
into the diff. The approximate weight of the diff including oil is 9.40g.
7.9g + 1.5g = 9.4g
To make sure that all the air is removed
from the diff oil, we recommend using the
HUDY Air Vac.
#304932
GRAPHITE GEAR DIFF BEVEL &
SATELLITE GEARS (2+4)
#104002
HUDY AIR VAC – VACUUM PUMP

8
COMPOSITE FRONT SOLID AXLE
FRONT & REAR AXLES
1. GEAR DIFFERENTIAL & FRONT SOLID AXLE
902310
SH M3x10
941015
BB 10x15x4
941015
BB 10x15x4
OIL
OIL
OIL
903256
SFH M2.5x6
Tighten the screws equally but do
NOT tighten them completely.
Finish tightening in this order.
➊
➋
➌
➍
NOTE
ORIENTATION
DETAIL
BEARING OIL
(HUDY #106230)
BEARING OIL
(HUDY #106230)
BEARING OIL
(HUDY #106230)
BEARING OIL
(HUDY #106230)
#305136
ALU SOLID DRIVESHAFT ADAPTERS
#305137
STEEL SOLID AXLE DRIVESHAFT ADAPTERS
HUDY SPRING STEEL™
OIL
CUTAWAY VIEW

9
305188
303760
306517
970050
902305
305578
970050
962042
305523 305880
902303
305578
305578
304900
903305
903308
903305
903305
902306
902306
902306
902306
902306
305435
305435
302766
302767
302767
302766
301550
301550
301550
301960
301550
302062
302062
302062
302062
902306
302960
301002
T4’20 Alu Flex
301000
T4’20 Graphite
2. CENTRAL TRANSMISSION
BAG
02
301550 T4’20 ALU UPPER CLAMP WITH 2 ADJ. ROLL-CENTERS (L+R)
301960 T4’20 ULP GRAPHITE SHOCK TOWER FRONT 3.0MM
302062 T4 COMPOSITE ADJUSTMENT BALL-BEARING HUB (4)
302766 T4’20 ALU LOWER ADJUSTMENT BULKHEAD - FRONT R / REAR L
302767 T4’20 ALU LOWER ADJUSTMENT BULKHEAD - FRONT L / REAR R
302960 T4’20 ULP GRAPHITE SHOCK TOWER REAR 3.0MM
303760 T4’20 ALU MOTOR MOUNT
305435 HIGH-PERFORMANCE DRIVE BELT 3x351MM
305523 ALU SOLID LAYSHAFT WITH BEARINGS
305578 FIXED PULLEY FOR LAYSHAFT WITH BEARINGS 20T (2)
305880 OFFSET SPUR GEAR 110T / 64
306517 T4’20 ALU TOP DECK MOUNT
902303 HEX SCREW SH M3x4 SMALL HEAD - STAINLESS (10)
902305 HEX SCREW SH M3x5 (10)
902306 HEX SCREW SH M3x6 (10)
903305 HEX SCREW SFH M3x5 (10)
903308 HEX SCREW SFH M3x8 (10)
962042 WASHER S 4x6x0.1 (10)
970050 O-RING 5x1 (10)
304900 XRAY GEAR DIFFERENTIAL - SET
305188 COMPOSITE SOLID AXLE 38T - SET
301000 T4’20 GRAPHITE CHASSIS 2.2MM
301002 T4’20 ALU FLEX CHASSIS 2.0MM - SWISS 7075 T6
#301001
T4’20 ALU SOLID CHASSIS 2.0mm
OFFSET SPUR GEARS 48P
#305772 72T / 48P OPTION
#305776 76T / 48P OPTION
#305778 78T / 48P OPTION
#305779 79T / 48P OPTION
#305781 81T / 48P OPTION
#305784 84T / 48P OPTION
#305784-O 84T / 48P OPTION
OFFSET SPUR GEARS 64P
#305860 90T / 64P OPTION
#305862 92T / 64P OPTION
#305866 96T / 64P OPTION
#305866-O 96T / 64P OPTION
#305869 99T / 64P OPTION
#305870 100T / 64P OPTION
#305870-O 100T / 64P OPTION
#305874 104T / 64P OPTION
#305876 106T / 64P OPTION
#305878 108T / 64P OPTION
#305880 110T / 64P INCLUDED
#305880-O 110T / 64P OPTION
#305882 112T / 64P OPTION
#305884 114T / 64P OPTION
#302063
ALU ADJUSTMENT BALL-BEARING HUB (2)
#305436
HIGH-PERFORMANCE DRIVE BELT LOW-FRICTION 3x351MM
#305578-O
FIXED PULLEY 20T - GRAPHITE (2)
#183001
HUDY PROFESSIONAL BULKHEAD
ALIGNMENT TOOL 17MM

10
903305
SFH M3x5
#183001
HUDY PROFESSIONAL BULKHEAD ALIGNMENT TOOL 17MM
To align the bulkheads straight, we
suggest using the HUDY Professional
Bulkhead Alignment tool.
See page 12, step 4
TO TIGHTEN FRONT BELT: Rotate both front nylon hubs in arrow direction BTO TIGHTEN REAR BELT: Rotate both rear nylon hubs in arrow direction B
FRONT BELT TENSION ADJUSTMENT
AB
REAR BELT TENSION ADJUSTMENT
BA
L=R L=R
ABA
B
TO LOOSEN FRONT BELT: Rotate both front nylon hubs in arrow direction ATO LOOSEN REAR BELT: Rotate both rear nylon hubs in arrow direction A
LOWER DIFF POSITION
UPPER DIFF POSITION
LOWER DIFF POSITION
UPPER DIFF POSITION
Front diff LOWER position - tab in top notch
- provides more front traction, but makes
the car push on-power.
Recommended for low-traction tracks. Recommended for low-medium traction tracks.
Front diff UPPER position - tab in bottom
notch - provides more steering, but less front
traction
Recommended for medium-high traction
tracks and technical tracks. Recommended for medium-high traction tracks.
Rear diff LOWER position - tab in top notch - provides
more rear traction (mainly on-power), makes the
car more stable in chicanes, but makes the car
push on-power.
Rear diff UPPER position - tab in bottom notch -
provides more on-power steering, but makes the
rear slightly more loose.
INITIAL POSITION FOR CARPET/ASPHALT
Place tab in this BOTTOM NOTCH
INITIAL POSITION FOR CARPET/ASPHALT
Place tab in this BOTTOM NOTCH
2. CENTRAL TRANSMISSION
NOTE
ORIENTATION
NOTE
ORIENTATION
#302063
ALU ADJUSTMENT BALL-BEARING HUB (2)
DETAIL
DETAIL
SOLID AXLE
GEAR DIFF

11
GEARING ADJUSTMENT
902304
SH M3x4
970050
O 5x1
966081
CH-CLIP 8
903305
SFH M3x5
903308
SFH M3x8
962042
S 4x6x0.1
902305
SH M3x5
NOTE
ORIENTATION
NOTE
ORIENTATION
NOTE
ORIENTATION
SHORT side
LONG side
3x5mm
SH
3x5mm
SFH
3x8mm
SFH
4x6x0.1mm
2. CENTRAL TRANSMISSION
1.
1.
2.
2.
3.
CUTAWAY VIEW
#305578-O
FIXED PULLEY 20T
GRAPHITE (2)
DETAIL
NOTE
ORIENTATION
NOTE
ORIENTATION
Snap Ring Pliers
#966081 CH-CLIP 8 (10)
INCLUDED IN THE LAST AID BAG
Another alternative to secure the pulley
on the layshaft is to use the Clip which is
included in the “Last Aid” Bag. To mount the
clip on the layshaft, you have to use special
Snap Ring Pliers. Snap Ring Pliers
#966081 CH-CLIP 8 (10)
INCLUDED IN THE LAST AID BAG
Another alternative to secure the pulley
on the layshaft is to use the Clip which is
included in the “Last Aid” Bag. To mount the
clip on the layshaft, you have to use special
Snap Ring Pliers.
OFFSET SPUR GEARS 48P
#305772 72T OPTION
#305776 76T OPTION
#305778 78T OPTION
#305779 79T OPTION
#305781 81T OPTION
#305784 84T OPTION
#305784-O 84T OPTION
OFFSET SPUR GEARS 64P
#305860 90T OPTION
#305862 92T OPTION
#305866 96T OPTION
#305866-O 96T OPTION
#305869 99T OPTION
#305870 100T OPTION
#305870-O 100T OPTION
#305874 104T OPTION
#305876 106T OPTION
#305878 108T OPTION
#305880 110T INCLUDED
#305880-O 110T OPTION
#305882 112T OPTION
#305884 114T OPTION

12
902306
SH M3x6
902306
SH M3x6
In order to have perfectly aligned bulkheads, we suggest to use Hudy
Professional Bulkhead Alignment tool. Please follow these steps:
#183001
HUDY PROFESSIONAL
BULKHEAD ALIGNMENT
TOOL 17MM
L=R L=R
DO NOT TIGHTEN FULLY
DO NOT TIGHTEN FULLY
DO NOT TIGHTEN FULLY
DO NOT TIGHTEN FULLY
FINISH TIGHTENING IN THIS ORDER. FINISH TIGHTENING IN THIS ORDER.
FULLY TIGHTEN FULLY TIGHTEN
FULLY TIGHTEN
FULLY TIGHTEN
Shock tower screws (4) Shock tower screws (4)
Bulkhead screws (4)
Bulkhead screws (4)
2. CENTRAL TRANSMISSION

13
FRONT DOWNSTOP
ADJUSTMENT
BAG
03
901310
SB M3x10
901310
SB M3x10
901408
SB M4x8
901408
SB M4x8
REAR DOWNSTOP
ADJUSTMENT
REAR ARMS - LONG
#303173-H HARD RIGHT OPTION
#303174-H HARD LEFT OPTION
#303173-G GRAPHITE RIGHT INCLUDED
#303174-G GRAPHITE LEFT INCLUDED
FRONT ARMS - LONG
#302173-H HARD RIGHT OPTION
#302174-H HARD LEFT OPTION
#302173-G GRAPHITE RIGHT INCLUDED
#302174-G GRAPHITE LEFT INCLUDED
2x
REAR ARMS - LONG
#303173-H HARD RIGHT OPTION
#303174-H HARD LEFT OPTION
#303173-G GRAPHITE RIGHT INCLUDED
#303174-G GRAPHITE LEFT INCLUDED
2x
FRONT ARMS - LONG
#302173-H HARD RIGHT OPTION
#302174-H HARD LEFT OPTION
#302173-G GRAPHITE RIGHT INCLUDED
#302174-G GRAPHITE LEFT INCLUDED
#307217 TITANIUM SUSPENSION PIVOT PIN (2)
302173
303173
#303731 ALU LOWER 2-PIECE
SUSPENSION 0.25 ECCENTRIC
HOLDER STAND
REAR ARMS
FRONT ARMS
3. FRONT & REAR SUSPENSION
302173 FRONT SUSPENSION ARM LONG RIGHT - GRAPHITE
302174 FRONT SUSPENSION ARM LONG LEFT - GRAPHITE
302713 T4’20 ALU FRONT LOWER 1-PIECE SUSPENSION HOLDER - FRONT - FF
302723 T4’20 ALU FRONT LOWER 1-PIECE SUSPENSION HOLDER - REAR - FR
303129 COMPOSITE SET OF WHEELBASE SHIMS (3x1MM; 1x2MM) (2)
303173 REAR SUSPENSION ARM LONG RIGHT - GRAPHITE
303174 REAR SUSPENSION ARM LONG LEFT - GRAPHITE
303723 T4’20 ALU REAR LOWER 1-PIECE SUSPENSION HOLDER - REAR - RR
303730 T4’20 ALU REAR LOWER 2-PIECE SUSPENSION HOLDER - FRONT (1)
307216 SUSPENSION PIVOT PIN (2)
362315 ECCENTRIC BUSHING SET (2)
901310 HEX SCREW SB M3x10 (10)
901408 HEX SCREW SB M4x8 (10)
903306 HEX SCREW SFH M3x6 (10)
362315
362315
303129
303129
901310
303174
303723
303129
303129
901408
901408
903306
307216
362315
307216
302174
302723
901310
903306
362315
302713
303730
5mm
REAR LEFT ARM REAR RIGHT ARM
2.3mm
L=R
INITIAL SETTING
LEFT REAR ARM 3x10mm
4x8mm
3mm
INITIAL SETTING
4x8mm
3x10mm
FRONT RIGHT ARM
L=R
FRONT LEFT ARMFRONT RIGHT ARM
2.2mm

14
TOE-IN
TRACK-WIDTH
WHEELBASE
ROLL CENTER
ANTI-SQUAT
PRO-SQUAT
1mm
903306
SFH M3x6
NOTE
ORIENTATION
903306
SFH M3x6
INITIAL SETTING
ECCENTRIC BUSHINGS HAVE TWO DIFFERENT OFFSETS FROM THE CENTER
Middle position = 0.5 mm or 0.5° from center
Outer position = 1mm or 1° from center
The XRAY rear alu lower suspension holders provide even greater range of adjustment for the rear suspension. Using different combinations of eccentric bushings, fine adjustment of rear
squat, rear toe-in, rear roll center, and rear track-width can be obtained. For more information about the influence of rear squat, rear toe-in, rear roll center and rear track-width on car
handling, please refer to HUDY Set-up Book (#209100).
Marked
“RR”
REAR SUSPENSION
Marked
“FR”
FRONT SUSPENSION
#303731 ALU LOWER 2-PIECE
SUSPENSION 0.25 ECCENTRIC
HOLDER STAND
INITIAL
SETTING
COMPOSITE ECCENTRIC
BUSHINGS
INITIAL SETTING
COMPOSITE ECCENTRIC
BUSHINGS
Do not use INNER positions. Available positions
COMPOSITE ECCENTRIC
BUSHINGS
NOTE
ORIENTATION
NOTE
ORIENTATION
303129
SHIM 3x6x1
1mm
L=R
#307217
TITANIUM SUSPENSION
PIVOT PIN (2)
L=R
#107633 HUDY Arm Reamer 3.0mm
It is extremely important that the arms move freely
on the pivot pins. If they do not, use the Arm Reamer
(3.0mm) to slightly resize the holes in the arms.
NOTE ORIENTATION
3. FRONT & REAR SUSPENSION

15
903306
SFH M3x6
303129
SHIM 3x6x1
TOE-IN
TRACK-WIDTH
WHEELBASE
ROLL CENTER
ANTI-DIVE
KICK-UP
All possible mounting
alternatives of eccentric bushings
1mm
1mm
ECCENTRIC BUSHINGS HAVE TWO DIFFERENT OFFSETS FROM THE CENTER.
Middle position = 0.5 mm or 0.5° from center
Outer position = 1mm or 1° from center
The XRAY front alu lower suspension holders provide even greater range of adjustment for the
front suspension. Using different combinations of eccentric bushings, fine adjustment of front
anti-squat, front kick-up, front toe-in, front roll center, and front track-width can be obtained.
For more information about the influence of front anti-dive, front kick-up, front toe-in, front roll
center and front track-width on car handling, please refer to HUDY Set-up Book.
Marked
“FF”
FRONT SUSPENSION
INITIAL SETTING
COMPOSITE ECCENTRIC
BUSHINGS
INITIAL SETTING
COMPOSITE ECCENTRIC
BUSHINGS
NOTE
ORIENTATION
NOTE
ORIENTATION
INITIAL SETTING
3. FRONT & REAR SUSPENSION
#307217
TITANIUM SUSPENSION
PIVOT PIN (2)
It is extremely important that the arms move freely
on the pivot pins. If they do not, use the Arm Reamer
(3.0mm) to slightly resize the holes in the arms.
L=R
#107633 HUDY Arm Reamer 3.0mm

16
#302612-O
ALU ADJ. TURNBUCKLE M3 L/R 39mm
ORANGE - SWISS 7075 T6 (2)
#302610
ADJ. TURNBUCKLE L/R 40mm
HUDY SPRING STEEL™ (2)
#303212-O
ALU ADJ. TURNBUCKLE L/R 26mm -
ORANGE - SWISS 7075 T6 (2)
#303212
ALU ADJ. TURNBUCKLE L/R 26mm -
SWISS 7075 T6 (2)
#301061
T4’20 GRAPHITE UPPER DECK 1.6MM
#302548
ALU STEERING PLATE 8MM FOR DUAL SERVO SAVER
4. STEERING
BAG
04
902306
301060 T4’20 GRAPHITE UPPER DECK 2.0MM
301172 ALU UPPER DECK COLLAR FOR FLEX ELIMINATION
302526 COMPOSITE DUAL SERVO SAVER ARM
302537 T4’20 ALU STEERING POST FOR DUAL SERVO SAVER (2)
302544 ALU SHIM FOR RADIAL PLAY ADJUSTMENT OF STEERING ARM (2)
302547-O T4 ALU STEERING PLATE 8.5MM FOR DUAL-SERVO SAVER - ORANGE
302612 ALU ADJ. TURNBUCKLE M3 L/R 39 MM - SWISS 7075 T6 (2)
302663 COMPOSITE BALL JOINT 5 MM - OPEN - V2 (8)
303126-K ALU SHIM 3x6x5.0MM - BLACK (10)
303129 COMPOSITE SET OF SHIMS (3x1MM; 1x2MM) (2)
303210 REAR TURNBUCKLE L/R 26 MM - HUDY SPRING STEEL (2)
303454 BALL JOINT 4.9MM - OPEN (4)
362650 BALL END 4.9MM WITH THREAD 6MM (2)
362652 BALL END 4.9MM WITH THREAD 10MM (2)
372503 COMPOSITE SERVO SAVER - X-STIFF - SET - V2
902305 HEX SCREW SH M3x5 (10)
902306 HEX SCREW SH M3x6 (10)
902308 HEX SCREW SH M3x8 (10)
903306 HEX SCREW SFH M3x6 (10)
903308 HEX SCREW SFH M3x8 (10)
930306 BALL-BEARING 3x6x2.5 STEEL-SEALED - OILED (2)
940508 BALL-BEARING 5x8x2.5 RUBBER-SEALED - OILED (2)
302663
302612
302663
302663
302612
302663
903306
302537
302526
372503
372503
372503
303129
362652
902305
302544
903308
303210
303454
940508
940508
301060
362650
303129
302547-O
930306
301172
902308
303126-K
362652
902306
#302525
ALU DUAL-SERVO SAVER ARM
#303071
BELT TENSIONER

17
940508
BB 5x8x2.5
930306
BB 3x6x2.5
903308
SFH M3x8
2x
L=R
303129
SHIM 3x6x1
approximately 47mm
NOTE
ORIENTATION
6mm THREAD
NOTE
ORIENTATION
STEERING LINKS SERVO LINK
Adjust servo link to fit your servo
65.4mm
INITIAL SETTING (1mm shim)
1mm 1mm 1mm 2mm
To change Ackermann angle, use 2 identical
shims (of same thickness) between the alu
steering plate and ball ends.
2x
2x
L=R
THREAD
THREAD
BEARING OIL
(HUDY #106230)
OIL
Install the pivot balls with Professional
Multi Tool (HUDY #183011)
#302612-O
ALU ADJ. TURNBUCKLE M3
L/R 39mm ORANGE - SWISS
7075 T6 (2)
#302610
ADJ. TURNBUCKLE L/R 40mm
HUDY SPRING STEEL (2)
3x6x2.5mm
5x8x2.5mm
Tighten the screws gently but fully, and then loosen 1/3
turn so the composite dual-servo saver moves freely.
➊ tighten fully
➋ loosen 1/3 ccw
➌ check free movement
(120° CCW)
4. STEERING
#302525
ALU DUAL SERVO SAVER ARM
We recommend using the aluminum dual-servo saver arms
when better steering response is needed. Also recommended
for asphalt tracks.
THREAD
THREAD
OIL
NOTE
ORIENTATION
#302548
ALU STEERING PLATE 8MM FOR DUAL SERVO SAVER
Optional 8mm steering plate reduces steering response and
increases cornering speed. Recommended for big open tracks,
but also on technical tracks with many chicanes as it decreases
over-steering and increases stability of the car in chicanes.
When using 8mm steering plate, remove
a bit of material from the ball joints so
they do not touch each other.
FREE
MOVEMENT

18
303129
SHIM 3x6x2
303126-K
SHIM 3x6x5
902305
SH M3x5
903306
SFH M3x6
2+2mm
5mm
10mm THREAD
10mm THREAD
HUDY ALU SERVO HORNS
#293501 KO, Sanwa - 23T
#293502 Hitec - 24T
#293503 Futaba - 25T
HUDY CLAMP ALU SERVO HORNS
#293407 KO, Sanwa - 23T
#293408 Hitec - 24T
#293409 Futaba - 25T
ALU SERVO HORNS - OFFSET
#293491 KO, Sanwa - 23T
#293492 Hitec - 24T
#293493 Futaba - 25T
CLAMP ALU SERVO HORNS - OFFSET
#293401 KO, Sanwa - 23T
#293402 Hitec - 24T
#293403 Futaba - 25T
For more in-corner steering and better steering response, aluminum servo horns may be used.
IMPORTANT!
When than aluminum horn is used, the steering servo saver is not used. This increases the risk of breaking the servo in serious crashes.
HUDY ALU SERVO HORNS
#293497 KO, Sanwa - 23T
#293498 Hitec - 24T
#293499 Futaba - 25T
HUDY CLAMP ALU SERVO HORNS
#293404 KO, Sanwa - 23T
#293405 Hitec - 24T
#293406 Futaba - 25T
INITIAL SETTING
H = (24T) Hitec
F = (25T) Futaba, Robe, Savox
K = (23T) KO, JR, Airtronics, Sanwa
4. STEERING
When using optional aluminum steering arms,
we suggest using optional shims #303134-K
(3x7.5x1.5mm) + #303123-K (3x6x2mm)
when you want to eliminate steering lock in
high-traction conditions. 3x6x2mm
3x7.5x1.5mm
3x7.5x1.5mm

19
902306
SH M3x6
902308
SH M3x8
CHASSIS FLEX SETTING
TOP DECK SETTING
930306
BB 3x6x2.5
May be used when the front
belt becomes worn and
loose. Belt tensioner is NOT
included in the kit and must
be purchased separately.
#303071
BELT TENSIONER SET
Post is not connected to the top deck.
This allows maximum flex setting
and provides maximum steering
characteristics. However, the car is
less stable on-power.
Post is connected to the top deck
via ball bearing. This allows the top
deck to flex to the sides but not to the
front/rear. This setting eliminates a
bit of steering but improves stability.
The new feature of the top deck is the flex setting adjustment.
There are three different flex setting alternatives.
Post is connected to the top deck
via aluminum bushing. This setting
provides maximum stability as it
stiffens the entire car and eliminates
flex to sides and front/rear.
TOP DECK FLEX SETTINGS
3x6mm
3x6mm
3x8mm
MEDIUM
STIFF
INITIAL SETTING
We recommend using optional 1.6mm top deck for super-low traction conditions or in combination with
aluminum chassis as it provides more overall traction and steering.
#301061
T4’20 GRAPHITE TOP DECK 1.6MM
4. STEERING
SOFT MEDIUM STIFF

20
05
BAG
901304
362648
303455
303457
303803
302814
930306
303212
980210
305341
302663
303455
362648
303457
901302
303433
302663
303212
305350-K
302253
305346
305394
305221
305328
362652
303123-K
302291
901304
362651
303127-K
303354
940510
303433
930306
901302
307221
362651 305350-K
901304
303122-K
362649
901304
902205
940510
305231
901302
305241
902310
302364
303123-K
902205
940510
940510
901302
980210
305253
305254
362649
307321
305392
302363
305253
901302
#305242
DRIVE SHAFT REPLACEMENT CAP
3.5MM - ORANGE - STRONG (4)
#307222 TITANIUM FRONT ARM PIVOT PIN (2)
#307322 TITANIUM REAR ARM PIVOT PIN (2)
UPRIGHTS
#303351 1° - R MEDIUM (2-HOLE)
#303352 0° - R/L MEDIUM (2-HOLE)
#303353 1° - R HARD (2-HOLE)
#303354 0° - R/L HARD (2-HOLE)
#303360 0° - R/L GRAPHITE (2-HOLE)
#303361 1° - L MEDIUM (2-HOLE)
#303362 0° - R/L MEDIUM (1-HOLE)
#303363 1° - L HARD (2-HOLE)
#303364 0° - R/L HARD (1-HOLE)
#303358 ALU 1° - R/L (4-HOLE)
#303359 ALU 2° - R/L (4-HOLE)
INCLUDED
5. FRONT & REAR TRANSMISSION
302253 COMPOSITE STEERING BLOCK - HARD
302291 STEEL STEERING BUSHING (2+2)
302363 COMPOSITE C-HUB RIGHT - 4° DEG. - MEDIUM - V2
302364 COMPOSITE C-HUB LEFT - 4° DEG. - MEDIUM - V2
302663 COMPOSITE BALL JOINT 4.9MM - OPEN - V2 (8)
302814 T4’20 ANTI-ROLL BAR FOR BALL-BEARINGS - FRONT 1.4 MM
303122-K ALU SHIM 3x6x1.0MM - BLACK (10)
303123-K ALU SHIM 3x6x2.0MM - BLACK (10)
303127-K ALU SHIM 3x6x4.0MM - BLACK (10)
303212 ALU ADJ. TURNBUCKLE M3 L/R 26 MM - SWISS 7075 T6 (2)
303354 COMPOSITE UPRIGHT 0° OUTBOARD TOE-IN - HARD
303433 ALU ANTI-ROLL BAR BUSHING - 6MM (2)
303455 COMPOSITE ANTI-ROLL BAR BALL JOINT 4.9 MM (4)
303457 BALL JOINT 4.9MM - EXTRA SHORT OPEN (4)
303803 ANTI-ROLL BAR FOR BALL BEARINGS - REAR 1.3 MM
305231 DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
305241 DRIVE SHAFT REPLACEMENT CAP 3.5 MM (4)
305221 ECS (ES) DRIVE SHAFT 51MM FOR 2MM PIN - HUDY SPRING STEEL™ (1)
305253 ECS DRIVE SHAFT COUPLING FOR 2MM PIN - HUDY SPRING STEEL™
305254 ECS (ES) DRIVE SHAFT CASE FOR 2MM PIN - HUDY SPRING STEEL™
305328 ALU DRIVE SHAFT SWISS 7075 T6 - HARDCOATED - 50MM
305334 ECS ES (ES) DRIVE SHAFT 51MM - HUDY SPRING STEEL™ - SET
305341 DRIVE AXLE - LIGHTWEIGHT - HUDY SPRING STEEL™
305346 ECS DRIVE AXLE FOR 2MM PIN - HUDY SPRING STEEL™
305350-K ALU WHEEL HUB - BLACK (2)
305392 DRIVE SHAFT PIN 2 x 10 WITH FLAT SPOT (2)
305394 ECS DRIVE SHAFT PIN 2 x 9 WITH FLAT SPOT (2)
307221 FRONT ARM PIVOT PIN (2)
307321 REAR ARM PIVOT PIN (2)
362648 BALL END 4.9MM WITH THREAD 4MM (2)
362649 BALL END 4.9MM WITH THREAD 5MM (2)
362651 BALL END 4.9MM WITH THREAD 8MM (2)
362652 BALL END 4.9MM WITH THREAD 10MM (2)
901302 HEX SCREW SB M3x2.5 (10)
901304 HEX SCREW SB M3x4 (10)
902205 HEX SCREW SH M2x5 (10)
902310 HEX SCREW SH M3x10 (10)
930306 BALL-BEARING 3x6x2.5 STEEL-SEALED - OILED (2)
940510 BALL-BEARING 5x10x4 RUBBER SEALED - OIL (2)
980210 PIN 2x10 (10)
#309002
SET OF CERAMIC
BALL-BEARINGS (14)
#303212-O
ALU TURNBUCKLE L/R 26mm
ORANGE - SWISS 7075 T6 (2)
#303210
TURNBUCKLE M3 L/R 26mm
HUDY SPRING STEEL™ (2)
STEERING BLOCKS
#302252 MEDIUM OPTION
#302253 HARD INCLUDED
#302254 GRAPHITE OPTION
#302256 ALU OPTION
DRIVE SHAFTS
#305323 50MM - STEEL
#305324 52MM - STEEL
#305326 52MM - ALU
#305332 52MM - ECS
#305333 50MM - ECS