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.
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.
SYMBOLS USED Part bags used Assemble in the specified order Assemble left and right sides the same way 05 Scale Pay attention here Assemble as many times as specified (here twice) 2x L=R Optional parts Apply grease Apply threadlock Ensure smooth non-binding movement Apply CA glue CA TL Tighten screw gently Apply oil Detail Completed assembly 1:1 OIL Apply cleaner DETAIL TOOLS REQUIRED Scissors (HUDY #188990) Special Tool for turnbuckles, nuts (HUDY #181090) Turnbuckle Wrench 3mm (H
NOT INCLUDED Set-up Book 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.
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1. FRONT & REAR DIFFERENTIAL 2x Front diff OIL Silicone oil 10 000cSt Fill just above the cross-pins. 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 10 000cSt Fill just above the cross-pins.
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3. REAR SUSPENSION 903312 363122-H 363321 362315 367210 362315 363112-H 363122-H 363112-H 363311 902308 903312 362472 901304 362003 901303 303431-K 303454 901308 303454 Remove the 3x6.5x2mm shim from each rear arm. #363313 BRASS REAR LOWER SUSPENSION HOLDER SET +2 - RR+RF ANTI-ROLL BARS SUSPENSION ARM REAR LOWER #362470 1.0mm OPTION #363112-H RIGHT HARD INCLUDED #362471 1.1mm OPTION #363122-H LEFT INCLUDED #362472 1.2mm INCLUDED #363112-G RIGHT GRAPHITE OPTION #362473 1.
3. REAR SUSPENSION SUSPENSION ARM REAR LOWER DETAIL From Rear Arm IMPORTANT REAR BLOCK SHIM 3x6.5x2 #363112-H RIGHT HARD INCLUDED #363122-H LEFT INCLUDED HARD DETAIL #363112-G RIGHT GRAPHITE OPTION #363122-G LEFT GRAPHITE OPTION Check for free movement 903312 SFH M3x12 Marked “L” ➍ ➌ RR INITIAL POSITION 1º 0.5º 0º 0.5º 1º ➊ ➋ Composite eccentric bushings ARM Marked “R” ARM 3x6.
3. REAR SUSPENSION 2x L=R 901308 SB M3x8 DETAIL 1.5mm 4mm 901303 SB M3x3 901304 SB M3x4 902308 ANTI-ROLL BARS #362470 1.0mm OPTION #362471 1.1mm OPTION #362472 1.2mm INCLUDED #362473 1.3mm OPTION #362474 1.4mm OPTION #362476 1.6mm OPTION #362478 1.8mm OPTION #362480 2.0mm OPTION STEP ➌ DETAIL DETAIL L=R 0mm SH M3x8 3x3mm ➌ ➋ 1.
3. FRONT SUSPENSION 903312 362315 362320 367210 362310 362315 903312 362112-H 361200 362112-H 902308 901303 303454 362473 901308 303431-K 362002 901304 303454 902308 Remove the 3x6.5x2mm shim from each front arm. ANTI-ROLL BARS SUSPENSION ARM FRONT LOWER #362470 1.0mm OPTION #362112 MEDIUM OPTION #362471 1.1mm OPTION #362112-H HARD INCLUDED #362472 1.2mm OPTION #362112-G GRAPHITE OPTION #362473 1.3mm INCLUDED #362474 1.4mm OPTION #362476 1.6mm OPTION #362478 1.
3. FRONT SUSPENSION SUSPENSION ARM FRONT LOWER DETAIL From Front Arm IMPORTANT FRONT BLOCK SHIM 3x6.5x2 DETAIL #362112 MEDIUM OPTION #362112-H HARD INCLUDED #362112-G GRAPHITE OPTION 903312 Check for free movement SFH M3x12 ➍ ➌ FR ➊ INITIAL POSITION 1º 0.5º 0º 0.5º ➋ 1º Composite eccentric bushings 3x6.5x2mm from front arm 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 0.5º 0º 0.5º 1º Arm Reamer 3.
3. FRONT SUSPENSION 2x L=R 901308 DETAIL SB M3x8 1.5mm 4mm 902308 SH M3x8 STEP ➌ DETAIL 901303 L=R SB M3x3 0mm ANTI-ROLL BARS DETAIL 901304 SB M3x4 902308 #362470 1.0mm OPTION #362471 1.1mm OPTION #362472 1.2mm OPTION #362473 1.3mm INCLUDED #362474 1.4mm OPTION #362476 1.6mm OPTION #362478 1.8mm OPTION #362480 2.0mm OPTION 3x3mm SH M3x8 ➌ ➋ 1.
4. REAR TRANSMISSION 302665 362651 363520 960030 322610 302665 325326 908210 362651 980210 323381 362280 323354-H 306219 325341 902205 365230 902310 325390 941014 902312 940513 365353 362316 306219 327210 902254 #323382 ALU REAR HUB PLATE FOR MULTI ADJ.
4. REAR TRANSMISSION 2x L=R DRIVE SHAFT (73mm) 980210 P 2x10 ➌ #106210 HUDY GRAPHITE GREASE #106213 HUDY JOINT GREASE - OPTION ➊ ➋ DETAIL Detail step ➌ INITIAL SETTING LONG AXLE 4 3 Drive shaft positions 4|3|2|1 2 2x 1 L=R ➍ ➎ WHEEL HUBS 12MM Use HUDY Ball-Bearing Grease #106220 - STANDARD #106221 - BLUE #106222 - RED 940513 BB 5x12x4 #365360 +4.5mm - 6 slots OPTION #365359 +3.75mm - 5 slots OPTION #365358 +3.0mm - 4 slots OPTION ➊ ➋ #365357 +2.25mm - 3 slots INCLUDED #365356 +1.
4. REAR TRANSMISSION 306219 Ensure that the rear upright moves freely. If it does not move freely, use sandpaper to thin both wheelbase adjustment shims. SHIM 3x6x1 LONGER WHEELBASE (INITIAL SETTING) Adjustment Shim IN FRONT OF HUB moves hub rearward. ARM 306219 SHIM 3x6x2 3x6x1mm 902254 3x6x2mm SH M2.5x4 DETAIL Check for free movement SHORTER WHEELBASE Adjustment Shim BEHIND HUB moves hub forward.
4. FRONT TRANSMISSION C-HUBS WHEEL HUBS 12MM #365360 +4.5mm OPTION #362210 RIGHT 9° - M OPTION #365359 +3.75mm OPTION #362210-H RIGHT 9° - H INCLUDED #365358 +3.00mm OPTION #362211 RIGHT 6° OPTION #365357 +2.25mm OPTION #362234 ALU RIGHT 12° OPTION #365356 +1.5mm #362220 LEFT 9° - M OPTION 302665 OPTION #365355 +0.75mm OPTION #362220-H LEFT 9° - H INCLUDED #365353 0mm INCLUDED #362221 LEFT 6° OPTION #365354 -0.
4. FRONT TRANSMISSION 2x DRIVE SHAFT (81mm) L=R #365201 ECS FRONT DRIVE SHAFT 81MM (2.
4. FRONT TRANSMISSION 2x 901306 SB M3x6 Check for free movement L=R DO NOT OVERTIGHTEN ➋ 9mm 20mm SHO RT 2x LON G NOTE ORIENTATION 1:1 L=R (HUDY #107633) ARM REAMER If the C-hub does not move freely, use a HUDY Arm Reamer to resize the hole. ➊ 33.5mm L=R 8mm THREAD THREAD THREAD 2x L=R Install the pivot balls with Professional Multi Tool (HUDY #183011) 10mm THREAD CAMBER 2x NOTE ORIENTATION L=R 362280 CON.
4. FRONT & REAR ASSEMBLY #361295 COMPOSITE CHASSIS BRACE REAR - MEDIUM 902316 #361179 BRASS CHASSIS BRACE REAR (40g) 902310 361178 902308 361182 960030 902312 361298 960030 #361294 COMPOSITE CHASSIS BRACE FRONT - MEDIUM 961032 361296 361320 361269-H #361269-M COMPOSITE CHASSIS SIDE GUARDS L+R - MEDIUM 960030 361297 961032 361269-H #361181 GRAPHITE REAR LOWER BRACE 2.
4. FRONT & REAR ASSEMBLY #361269-M COMPOSITE CHASSIS SIDE GUARDS L+R (MEDIUM) 903308 SFH M3x8 903310 SFH M3x10 The medium side guards increase chassis flex and are recommended for low-traction tracks. #361106 ALU CHASSIS - SWISS 7075 T6 (2.5MM) 903314 SFH M3x14 3x10mm 960030 N M3 3x14mm 3x8mm ALU NUTS M3 961032 S 3.
4. FRONT & REAR ASSEMBLY #361181 GRAPHITE REAR LOWER BRACE 2.0MM 3x16mm 902314 SH M3x14 Do not use this composite brace when using graphite chassis brace. After you mount the rear suspension assembly to the chassis, fully tighten all 4 screws that were previously left untightened (page 25, step 2).
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5. STEERING THREAD LOCK OIL 970100 O 10x1.5 DETAIL INITIAL PRELOAD SETTING 3~4mm CLEANER SERVO SAVER NOTE ORIENTATION STEERING PLATE #362571 HARD INCLUDED #362571-G GRAPHITE OPTION #362574 ALU OPTION 902310 SH M3x10 Increases steering precision and predictability and is recommended for use in high-traction conditions. Includes extra Ackermann positions for very precise steering adjustment.
5. STEERING 303125 SHIM 3x6x3 3x6x3mm 3x6x3mm 903310 SFH M3x10 2x 31.5mm L=R THREAD Install the pivot balls with Professional Multi Tool (HUDY #183011) 10mm Thread THREAD 2x L=R 362280 CON.
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6. SLIPPER CLUTCH ASSEMBLY ALTERNATIVE 1 TIGHTEN GENTLY FORWARD WEIGHT POSITION (INITIAL SETTING) NOTE ORIENTATION 902318 SH M3x18 #364024 ALU CENTRAL BULKHEAD 903308 SFH M3x8 FORWARD WEIGHT POSITION More traction on the front suspension, increases rotation of the car in corners, recommended for use on medium- and high-traction tracks.
6. SLIPPER CLUTCH ASSEMBLY SLIPPER CLUTCH ADJUSTMENT ➊ Untighten set-screw 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. ➋ Adjust ➌ Tighten set-screw To LOOSEN: Rotate the spur gear in the counterclockwise (CCW) direction. To TIGHTEN: Rotate the spur gear in the clockwise (CW) direction.
7. SHOCK ABSORBERS PISTONS DETAIL 2 holes 2 holes (1.6mm) (1.7mm) Thick Shim 368010 0 holes (Create custom holes) (0mm - use required drill pin) Thick Shim Thin Shim 2 holes 2 holes (1.6mm) (1.7mm) 965023 0 holes (Create custom holes) (0mm - use required drill pin) 368031 368160 363240 902205 These pistons can NOT be used in shocks without making the custom holes by yourselves.
7. SHOCK ABSORBERS 4x ➋ ➌ 965023 There are two different thickness shims, use them as shown. Use the same procedure when building both front and rear shocks. ➊ C 2.3 FRO NT 2 holes (1.6mm) 970080 O 8x1 2x - SH ORT THICK Shim SHO CK R O-ring OD THIN Shim 972031 O 3x2.1 INITIAL PISTON SETTING O-ring 2 holes (1.7mm) 2x ➌ ➊ ➋ REA R- LON G SHOCK DAMPING SHOCK PISTONS SHO CK R OD #306219 DOWNSTOP SHIMS IMPORTANT THICKER shim used, GREATER downstop is achieved.
7. SHOCK ABSORBERS DEFAULT SHOCK REBOUND SETTING 0% REBOUND Follow the steps below to set the shock rebound to the default setting of 0%. FRONT (SHORT) 2x Oil 700cSt 2x REAR (LONG) Oil 500cSt 902205 SH M2x5 TIGHTEN FULLY 3~5x UP & DOWN ➊ ➋ ➌ ➍ ➎ Extend the shock shaft completely. Fill the shock body with the shock oil. For the FRONT shocks (short) use 700cSt oil. For the REAR shocks (long) use 500cSt oil.
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8. FINAL ASSEMBLY INITIAL POSITION ➋ DETAIL 960030 N M3 ➊ ➍ NOTE ORIENTATION DETAIL 902316 INITIAL POSITION SH M3x16 ➌ INITIAL POSITION ALU NUTS M3 ➋ 960030 N M3 #296530-B BLUE OPTION #296530-K BLACK OPTION #296530-O ORANGE OPTION ➊ #960030 STEEL INCLUDED #960031 SILVER OPTION DETAIL ➍ DETAIL NOTE ORIENTATION 902312 SH M3x12 INITIAL POSITION ➌ SERVO LINK Adjust servo link to fit your servo.
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8. FINAL ASSEMBLY 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. ➍ Apply paint masks as appropriate.
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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.
APPLIED APPLIED RACE REAR UPRIGHT SHOCK TOWER TRACK NAME DATE LAPS sec mm OPEN MEDIUM TIGHT MEDIUM LOW LONGER BUSHINGS TRACK SURFACE SMOOTH MEDIUM BUMPY UP DOWN HARD PACKED SOFT DIRT CLAY BLUE GROOVE ASTRO TURF GRASS DRY 2 1 ROLL ENTER 12 MIDDLE REAR GEAR DIFF BALL DIFF GEAR DIFF SLIPPER GEAR DIFF BALL DIFF OIL OIL cSt cSt OIL COMPOSITE STEEL COMPOSITE STEEL ALU SLIPPER ADJUSTMENT COMPOSITE STEEL ALU PINION COMPOSITE STEEL % REBOUND PISTONS % ° mm OPTIONAL A
RC AMERICA, 2030 Century Center Blvd #15, Irving, TX 75062, USA PHONE: 214-744-2400, FAX: 214-744-2401, xray@rcamerica.
