Xray XT8 Instruction Manual
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Xray XT8 Instruction Manual

Xray luxury racing 1/8 nitro truggy kit
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  • Page 2: Safety Precautions

    Phone: (800) 519-7221 * (214) 744-2400 many other goodies. We pride ourselves on taking excellent care of our customers. Fax: +421-32-7401109 Fax: (214) 744-2401 You can join thousands of XRAY fans and enthusiasts in our online community at: Email: info@teamxray.com Email: xray@rcamerica.com www.teamxray.com Failure to follow these instructions will be considered as abuse and/or neglect.
  • Page 3 • Make sure that chassis screws do not protrude from the chassis. Please support your local hobby shop. We at XRAY Model Racing Cars support all local • For the best performance, it is very important that great care is taken to ensure the hobby dealers.

  • Page 4: Symbols Used

    SYMBOLS USED Part bags used Assemble in the Assemble left and Assemble front Pay attention Assemble as Apply instant Apply oil Apply Grease Apply Thread specified order right sides the and rear the same here many times glue Lock same way as specified (here twice) Cut off shadded...

  • Page 5: Front & Rear Differential

    1. FRONT & REAR DIFFERENTIAL 964030 940816 355030 355020 971060 980212 964030 355030 355090 980212 355080 971060 964060 355061 355043 903312 940816 355060 BAGS 35 5020 DIFFERENTIAL CASE 90 3312 HEX SCREW SFH M3x12 (10) 35 5030 STEEL DIFF BEVEL & SATELLITE GEARS (2+4) 94 0816 HIGH-SPEED BALL-BEARING 8x16x5 BLUE COVERED (2) 35 5043...

  • Page 6: Very Important

    FRONT & REAR DIFFERENTIAL 940816 BB 8x16x5 Use LONG diff Use SHORT diff outdrive for FRONT outdrive for REAR differential differential BEARING OIL STEP DETAIL 964060 S 6x18x0.2 971060 O 6x1.5 980212 P 2x11.6 VERY IMPORTANT! Use these silicone oils included in the FRONT kit for initial settings: DIFFERENTIAL...

  • Page 7: Center Differential

    CENTER DIFFERENTIAL 964030 940816 355030 355020 971060 964030 980212 355030 355090 980212 355080 971060 964060 355048 903312 940816 355070 35 5020 DIFFERENTIAL CASE 90 3312 HEX SCREW SFH M3x12 (10) 35 5030 STEEL DIFF BEVEL & SATELLITE GEARS (2+4) 94 0816 HIGH-SPEED BALL-BEARING 8x16x5 BLUE COVERED (2) 35 5048 CENTER DIFF SPUR GEAR 48T - HUDY STEEL...
  • Page 8 CENTER DIFFERENTIAL 940816 BB 8x16x5 STEP DETAIL BEARING OIL 964060 S 6x18x0.2 971060 O 6x1.5 980212 P 2x11.6 VERY IMPORTANT! CENTER 01.3 DIFFERENTIAL Use the following silicone oil included in the kit for initial setting: Fill differential by only, so that oil Center diff: 10000cSt is up to the middle of the pin.

  • Page 9: Front Transmission

    CENTRAL CVD SHAFT UNIVERSAL JOINT - HUDY SPRING STEEL ™ 98 1266 PIN 2.5x16 (10) 35 5608 XT8 CVD UNIV. CENTR. DRIVE SHAFT - SET - HUDY SPRING STEEL ™ 35 5680 XT8 UNIVERSAL CENTRAL CVD DRIVE SHAFT - HUDY SPRING STEEL ™ DETAIL...

  • Page 10: Rear Transmission

    CENTRAL CVD SHAFT UNIVERSAL JOINT - HUDY SPRING STEEL ™ 98 1266 PIN 2.5x16 (10) 35 5608 XT8 CVD UNIV. CENTR. DRIVE SHAFT - SET - HUDY SPRING STEEL ™ 35 5680 XT8 UNIVERSAL CENTRAL CVD DRIVE SHAFT - HUDY SPRING STEEL ™ DETAIL...
  • Page 11 TECH TIP FRONT & REAR DIFF GEAR MESH ADJUSTMENT In the event that the composite diff bulkhead allows too much diff side play, this may create non-optimal gear mesh between the diff spur gear and the pinion drive gear. This is easily resolved by inserting 1 or 2 of the included thin shims behind a diff outdrive ball-bearing, depending on how much play there is.

  • Page 12: Rear Suspension

    HEX SCREW SH M3x18 (10) 35 2470 BALL JOINT 5.8 (8) 90 3308 HEX SCREW SFH M3x8 (10)) 35 3118 XT8 REAR LOWER SUSPENSION ARM 90 9372 SCREW PHILLIPS SS 3.5x22 (10) 35 3428 REAR ANTI-ROLL BAR 2.8MM 90 9395 SCREW PHILLIPS SS 3.5x45 (10)
  • Page 13 960030 355250 901504 940816 35 2638 XT8 ADJ. TURNBUCKLE M5 L/R 91 MM - HUDY SPRING STEEL (2) 35 5280 XT8 UNIVERSAL CVD DRIVE SHAFT - HUDY SPRING STEEL™ 35 3130 REAR UPPER INNER CAMBER LINK BALL JOINT (2) 35 7330...
  • Page 14 REAR SUSPENSION Please ensure that the rear upright moves freely. In case the rear upright is not moving freely use use sandpaper to thin both wheelbase adjustment shims until the rear upright moves freely. 902305 SH M3x5 INITIAL POSITIONS Shims for wheel base adjustment 961032 S 3.2...

  • Page 15: Front Suspension

    35 2000 DIFF BULKHEAD BLOCK SET FRONT 35 7211 LOWER INNER PIVOT PIN WITH GROOVE F/R (2) 35 2118 XT8 FRONT LOWER SUSPENSION ARM RIGHT 90 1303 HEX SCREW SB M3x3 (10) 35 2128 XT8 FRONT LOWER SUSPENSION ARM LEFT...
  • Page 16 96 0030 NUT M3 (10) 98 0264 PIN 2.5x14 (10) 35 5208 XT8 CVD UNIVERSAL DRIVE SHAFT F/R - SET - HUDY SPRING STEEL™ 98 0317 PIN 3x17 (10) 35 5219 CVD DRIVE AXLE - HUDY SPRING STEEL™ 35 5239...
  • Page 17 FRONT SUSPENSION 902305 SH M3x5 DISASSEMBLY ASSEMBLY STEP DETAIL Remove 3x5 screw holding composite Press pivot ball into bushing in arm. Push out the pivot pin from the rear to arm until it snaps into place remove the composite bushing. DOT IN FRONT 13 mm DOT IN FRONT...

  • Page 18: Front & Rear Assembly

    960030 960030 351120 351200 903412 903312 903412 35 1120 XT8 ALU CHASSIS - HARDCOATED SWISS 7075 T6 (3MM) 90 2312 HEX SCREW SH M3x12 (10) 35 1200 FRONT & REAR BUMPER 90 3312 HEX SCREW SFH M3x12 (10) 35 3089...
  • Page 19 FRONT & REAR ASSEMBLY 902312 SH M3x12 SH M3x12 903312 SFH M3x12 960030 N M3 SFH M3x12 903412 SFH M4x12 DETAIL...
  • Page 20 STEERING PLATE BUSHING (2) 94 0610 HIGH-SPEED BALL-BEARING 6x10x3 BLUE COVERED (2) 35 2618 XT8 ADJ. TURNBUCKLE M4 L/R 86 MM - HUDY SPRING STEEL (2) 96 0030 NUT M3 (10) 35 2651 BALL STUD 5.8MM WITH BACKSTOP - V2 (2) 97 1120 SILICONE O-RING 12x1.6 (10...
  • Page 21 STEERING 903310 SFH M3x10 940610 BB 6x10x3 3x10 3x10 3x14 FASTEN 903308 TIGHTLY SFH M3x8 903310 SFH M3x10 903312 903314 SFH M3x12 SFH M3x14 903410 SFH M4x10 960030 N M3 4x10 3x12 960030 N M3 composite shim composite shim Relief ball joint Relief ball joint INITIAL POSITION 65.5 mm...
  • Page 22 8. CENTER DIFF & BRAKE 902330 354040 901304 903308 354055 354040 354080 354040 902316 354011 354120 354130 902316 CENTER DIFF 354110 354011 903308 903412 35 4011 CENTER DIFF MOUNTING PLATE SET - HIGHER 90 1304 HEX SCREW SB M3x4 (10) 35 4040 BRAKE CAM POST &...
  • Page 23 CENTER DIFF & BRAKE 901304 SB M3x4 2 mm 0 mm 903308 SFH M3x8 Before inserting 3x30 long screws, loosen the four flat-head screw in the upper graphite plate by 1/2 turn. Tighten all screws after assembly. DETAIL 902330 SH M3x30 903308 NOTE ORIENTATION SFH M3x8...
  • Page 24 9. FUEL TANK & ENGINE 908312 902316 Manifold (not included) 902308 358601 902316 Pipe 358930 (not included) Engine (not included) 964073 Screw 964074 (not included) 358685 964075 358680 358540 (OPTION) 358710 903310 358550 358584 359050 960030 358531 358513 961025 962050 358722 902308 358561...
  • Page 25 SFH M3x10 911410 SHF M4x10 DETAIL EXTREMELY IMPORTANT !!! It is very important to ensure that your XT8 3x10 has properly adjusted gear mesh. Adjust the gear mesh so there is slightly larger play 902316 between the spur gear and clutch bell teeth.

  • Page 26: Radio Case

    35 2460 PIVOT BALL 5.8 (10) 90 2305 HEX SCREW SH M3x5 (10) 35 2648 XT8 ADJ. TURNBUCKLE M3 L/R 62 MM - HUDY SPRING STEEL (2) 90 2308 HEX SCREW SH M3x8 (10) 35 2650 BALL STUD 5.8MM (4)
  • Page 27 RADIO CASE SH M3x10 KO PROPO 902308 Route steering servo lead SH M3x8 behind lead clamp NOTE ORIENTATION FUTABA 903308 SH M3x8 SFH M3x8 SFH M3x8 SANWA SH M3x10 NOTE ORIENTATION Use appropriate servo stands Servo M3x8 screw 902310 SH M3x10 Servo stands Route receiver wire through mounting hole in top plate...

  • Page 28: Shock Absorbers

    35 8096 XRAY SPRING-SET HARD DARK-BLUE (2+2) 35 8011 COMPOSITE SHOCK ADJUSTABLE CLIPS 35 8128 XT8 ALU FRONT SHOCK BODY - HARD COATED (2) BAGS 35 8012 COMPOSITE SET OF SHIMS FOR SHOCKS 0.7 & 1.3 MM 35 8168 XT8 FRONT SHOCK SHAFT (2)
  • Page 29 SHOCK ABSORBERS FRONT SHOCKS REAR SHOCKS Grip the shock rod at top of exposed Grip the shock rod at top of exposed threads with side cutting pliers. Be threads with side cutting pliers. Be careful not to damage the shock rod. careful not to damage the shock rod.

  • Page 30: Final Assembly

    35 9830 TRUGGY WHEELS STARBURST AERODISK - WHITE (4) 35 6400 BRAKE/THROTTLE SYSTEM - SET 35 9930 XRAY TRUGGY PIN TIRE - THRAX + FOAM INSERTS (2) 35 6510 CLOSED BALL JOINT 3.9 (4) 90 1303 HEX SCREW SB M3x3 (10)
  • Page 31 FINAL ASSEMBLY INITIAL POSITIONS 902320 SH M3x20 902322 SH M3x22 INITIAL POSITIONS REAR SHOCKS (LONG) 960030 N M3 3x20 SILICONE Use servo horn depending on your servo TUBING 10mm 901303 SB M3x3 K - KO Propo F - Futaba H - Hitec Thread brake rods into plastic pivots until flush with outer end 902310...
  • Page 32 FINAL ASSEMBLY The fuel filter has a small hole that fits into notch on the composite holder to prevent the filter from turning freely Use the fuel tubing holders where neccessary. Cut the silicone tube depending on engine and muffler. Use the plastic Use the fuel clips to hold the tubes together.
  • Page 33 THROTTLE LINKAGE ADJUSTMEN NEUTRAL (IDLE) ADJUST INDIVIDUAL LINKAGES SEPARATELY TO AVOID 0.5mm INTERFERING WITH THE OPERATION OF THE OTHERS Engine idling ~1mm Idling Adjustment Screw. Use to adjust the idle setting of the carburetor. * Turn on the transmitter and receiver and set the engine control servo trim to the neutral position. * Adjust the idle adjustment screw on the carburetor to open approx.

  • Page 34: Troubleshooting Guide

    TROUBLESHOOTING GUIDE PROBLEM CAUSE SOLUTION Engine does not • Fuel tank is empty or carburetor is not • Fill fuel tank with fuel and prime start primed • Replace glowplug or recharge/replace glowdriver • Bad glowplug or dead glowdriver battery battery •...

  • Page 35: Engine Operation

    ENGINE OPERATION Preparing to operate the engine • Never modify the engine or muffler. • Confirm the position of needle and idling before running. Be sure to run a new engine smoothly. • Make sure the air filter is clean and oiled. •...
  • Page 36 XT8 includes innovative set-up features that allow you to change adjustments quickly and easily. Please refer to the XT8 Basic Set-Up Sheet for a good overall starting point. After rebuilding the chassis, or in case you become lost with your set-up, always return to the basic starting set-up described here.
  • Page 37 · decreases chassis roll if used with “thicker” oil · use with thinner oil if track is rough Larger · softer damping XT8 comes with pistons which feature 2 · increases traction holes. With 2 hole pistons you should · quicker chassis weight transfer usually use thinner shock oils.
  • Page 38 XT8 SET-UP You can use shock springs of different rates to alter performance. Shock springs Characteristics Softer · more chassis roll · more traction · better on bumpy tracks · increases chance of bottoming out when landing Stiffer · less chassis roll ·...
  • Page 39 XT8 SET-UP SERVO SAVER PRELOAD Adjust the preload of the central servo saver by adjusting the tension on the spring with the threaded collar. Servo saver spring preload Characteristics Softer · less steering · better suited to standard servos Stiffer ·...
  • Page 40 XT8 SET-UP H FRONT KICK-UP STANDARD PARTS Using standard parts included in the XT8 kit, you can easily adjust the kick-up of the front lower arms by changing the = 4° = 5° lower plate at the REAR of the front bulkhead. You can use either the 4° or 5° plate.
  • Page 41 REAR TOE-IN Rear toe-in is adjustable on the XT8 through the use of various plates that capture the rear lower inner pins. Additional adjustability is available through the use of optional I.S.S. plates, eccentric bushings, and pins. REAR TOE...
  • Page 42 = 1° = 2° Using standard parts included in the XT8 kit, you can easily adjust the rear anti-squat by changing the lower plate at the FRONT of the rear bulkhead. You can use either the 1° or 2° plate.
  • Page 43 H DIFFERENTIALS Adjust the characteristics of the differentials by using thinner or thicker silicone oil. Use only the genuine premium quality XRAY silicone diff Changing the oil in the front differential affects overall steering response. oils. The differential oils are Changing the oil in the center differential affects the front-to-rear drive.
  • Page 44 PHONE: 214-744-2400, FAX: 214-744-2401, xray@rcamerica.com PHONE: 214-744-2400, FAX: 214-744-2401, xray@rcamerica.com ALL RIGHTS RESERVED. © XRAY. ALL ARTWORK & DESIGN BY XRAY. ALL RIGHTS RESERVED. © XRAY. ALL ARTWORK & DESIGN BY XRAY. ALL RIGHTS RESERVED. © XRAY. ALL ARTWORK & DESIGN BY XRAY.

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