Ofna Racing ultra mbx comp Instruction Manual
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Ofna Racing ultra mbx comp Instruction Manual

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INSTRUCTION MANUAL
Ultra MBX Comp Rev:01

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  • Page 1 INSTRUCTION MANUAL Ultra MBX Comp Rev:01...
  • Page 2 REQUIRED FOR OPERATION You will need to buy a few items to start the engine and run the car. THINGS NEEDED • Use 20% nitro CAR fuel. Do not use airplane or heli fuels, they will over heat engine. • Buy LONG glow plugs, like OFNA 51009 for auto start. Use plugs without idle bar.
  • Page 3 MUST READ THIS BEFORE RUNNING Running a nitro kit is fun and easy, but to make this a safe rusting. • Clean oil and dirt from chassis with a degreaser. and good experience you must observe a few rules. This kit is extremely fast, easily over 40MPH, and can seriously Precautions injure someone if you are not careful.
  • Page 4 ASSEMBLY OF THE THROTTLE LINKAGE SYSTEM #30800 #30530 Plastic Throttle Plastic Throttle * Snap On. Ball Joint 3X3mm 3X3mm 2mm Rod Set Screw Set Screw Throttle Spring #10300 3X3mm Set Screw Alum.Stopper Fuel Tube ( 6mm ) #10300 Alum.Stopper * Align throttle servo same Plastic Collar as shown.
  • Page 5 ASSEMBLY OF THE FRONT AND REAR DIFFERENTIAL Step 1 *Builds two differentials for font and rear. 30779 *Notice the straight 2x12.8 holes are for the front and rear only. 30769 Diff. Gear (Large) 30779 30620 7x19x6mm O-Ring Ball bearings 30901 30751(Fro nt/Rear) Cap Joint 30761(Center)
  • Page 6 ASSEMBLY OF THE CENTER DIFFERENTIAL 30769 Step 1 *Notice the tapered Diff. Gear holes are for the (Large) center differential only. 30779 2x12.8 30779 O-Ring 30620 7x19x6mm Ball bearings 30761(center) 30911 30751(F/R) Diff. Case Break Cap Joint 30773 4x27mm Cross Pin 30779 2x12.8mm 30620...
  • Page 7 ASSEMBLY OF THE SPUR GEAR 30111 31040 3x10mm 51T Spur Gear Flat Head Hex Screw *Notice the tapered holes are for the center diff. Only. 35313 M3 Nylon Nut 35313 Nylon Nut 94033 M3x3 Set Screw 30111 3x10mm Flat Head Hex Screw Center differential assembly...
  • Page 8 ASSEMBLY OF THE BRAKE CAM AND CENTER PLATE ASSEMBLY OF THE BRAKE CAM AND BRAKE PADS 94004 30213 3X12mm Brake Cam Hex Screw 30652 Center Diff. Plate 30211 Plastic Bushing 30212 Ball Bearing 94004 3X12mm Hex Screw 30211 Plastic Bushing 30212 Ball Bearing 30211...
  • Page 9 ASSEMBLY OF THE FRONT BEVEL GEARS 30120 *Push 3mm tubes into the Bevel Gear holes of the diff. Case. (Large / Metal) 30121 4x3x3mm Chromed Tube 30121 3x5mm Hex Screw * Builds two differential for front and rear. 30121 3x4x4mm Chromed Tube 30121 3x5mm...
  • Page 10 ASSEMBLY OF THE CVD DUST COVER *Made two CVD joint. 10189 CVD Dust Cover 40105 CVD Joint ASSEMBLY OF THE KNUCKLE ARMS 40105 CVD Joint Assembly of the right and left hand side are the same. 36901 Ball type Knuckle Arm(Left) * "L"...
  • Page 11 ASSEMBLY OF THE FRONT ARMS 3mm E-Ring 30151 4mm Arm Shaft 2.5mm E-Ring 36170 3mm Arm Shaft *Approx. 2.6mm Assembly of the right and left hand side are the same. 36881 Front Upper Arm *Approx. 3mm 36881 Front Lower Arm 90020 2.5mm E-Ring...
  • Page 12 CLIP IN THE CASTER ADJUSTER use adjuster t o change the caster angle . 36905 Caster Adjuster Caster Adjuster Caster Adjuster *Caster angle will *Caster angle will Caster Adjuster become bigger. become less. Assembly of the right and left hand side are the same.
  • Page 13 ASSEMBLY OF THE REAR GEAR BOX 30130 Bevel Gear (Small) Step 1 30630 30010 6x13x5mm 90026 Gear Box Ball Bearing 5x5mm Step 2 Set screw * place 5X4 mm set screw in D cut 90026 5x5mm Set screw 30630 6x13x5mm Ball Bearing 36730 Cap Joint...
  • Page 14 ASSEMBLY OF THE REAR UPPER ARM ROD ASSEMBLY OF THE REAR WHEEL HUB * Builds two uppers for left *Builds two rear wheel hubs for use. and right hand-side. 40065 Rear Upper arm Plastic Rod End 36880 36082 Turnbuckle 36053 Rear Wheel 8x16x5mm Axle Shaft...
  • Page 15 ASSEMBLY OF THE REAR STABILIZER ASSEMBLY OF THE STABILIZER ROD 94035 3x8mm Screw 3x8x0.8mm Washer 94033 M3x3 Set Screw 40199 94006 Stabilizer 3x18mm Ball End Washer 34028 Stabilizer 3x8x0.8mm 94035 30341 Washer M3x8mm Stabilizer Ball 94035 Set Screw 3x8mm Screw 30403 40199 6mm Ball...
  • Page 16 ASSEMBLY OF THE SERVO SAVER 36746 94006 36743 E-Ring M3x16mm Hex Screw E-Ring 36740 Servo Saver 36740 Top Adapter Servo Saver Hom A 36742 Servo Saver 36740 Bushing 36740 Servo Saver Servo Saver Hom A Horn B 36741 35313 Servo Saver M3 Nylon Nut Spring 36740...
  • Page 17 ASSEMBLY OF THE FRONT GEAR BOX ONTO CHASSIS * Insert the front bumper before assembly. 34016 30240 Chassis (Hard-coated) Front Bumper 94026 4x12mm Flat Head Hex Screw 94019 3x10mm 94027 Flat Head 4x16mm 94023 Hex Screw Flat Head 3x25mm Hex Screw Flat Head Hex Screw 94027 4x16mm...
  • Page 18 ASSEMBLY OF THE REAR BOX ONTO CHASSIS 94023 3x25mm Flat Head Hex Screw 36100 Center Drive *Insert drive shaft into Shaft (Rear) cap joint before assembly. 94027 4x16mm Flat Head Hex Screw 34016 Chassis (Hard-coated) 94027 4x16mm Flat Head Hex Screw 94023 94027 3x25mm...
  • Page 19 ASSEMBLY OF THE FRONT SERVO AND RADIO TRAY 34026 Servo Washer 94003 94003 3X10mm 3X10mm Hex Screw Hex Screw 34026 Servo Washer 94003 94003 3X10mm *Put the protection rubber 3X10mm Hex Screw onto your servo. Hex Screw 34026 Servo Mount 34026 Servo Washer 34025...
  • Page 20 ASSEMBLY OF THE RADIO TRAY ONTO CHASSIS 34070 94003 94003 Rear Stiffener 3X10mm 3X10mm Hex Screw Hex Screw 94004 3X12mm Hex Screw 94004 3X12mm Hex Screw 94019 JP-08 Fuel Tank 3x10mm Flat Head Hex Screw 30287 Alum. Fuel Tank Post 94019 3x10mm 94004...
  • Page 21 ASSEMBLY OF THE ENGINE ONTO CHASSIS 94026 4x12mm Flat Head Screw 94036 5x4mm 35313 Set Screw M4 Nylon Nut 35313 94036 Nylon Nut 5x4mm Set Screw 30491 Muffler Stay 30481 94026 5X12mm 4x12mm Hex Screw Flat Head Hex Screw ASSEMBLY OF THE FRONT STEERING ROD 94004 3X12mm Hex Screw...
  • Page 22 ASSEMBLY OF THE CLUTCH Step1 Step2 Place the clutch shoes with the clutch springs over the 3 pins of the flywheel. Using a phillips screw driver or needle nose pliers and bend the small end lf the Fit the flywheel using clutch spring behind the a pair of the plIer and pilot shaft #174D or #180D...
  • Page 23 30800 ASSEMBLY OF THE THROTTLE LINKAGE 2X8mm Hex Screw 30800 30800 2X4mm Step1 Step2 Step3 Hex Screw 2X25mm 30800 Hex Screw Servo Mount 94033 ½L 30172 30800 3x3mm 2X65mm 2X7mm Set Screw Washer 30800 Tie-Rod 30800 Adjust Mount 30800 30172 Adjust Mount 2X65mm 30800...
  • Page 24 ASSEMBLY OF THE SHOCK Fit the o-ring into groove. 40060 40059 49041 2.5mm Oil Seal Nylon Nut 40076(Front) ( Make 2 for front.) Shock body 40059 14.7mm O-Ring 40090 3.5mm O-Ring 32235 2.6x5mm 40090 Shock Piston Washer 3.5mm O-Ring 40056 Shock Plastic * Short shaft 40090...
  • Page 25 ASSEMBLY OF THE FRONT AND REAR SHOCK ABSORBER 30702 3X20mm Screw 35313 M3 Nylon Nut 40056 Plastic bushshing 35313 Nylon Nut * Take the plastic bushing from the shock plastic parts tree. 30702 3x20mm Cap Screw 40056 Plastic bushshing 35313 Nylon Nut * Take the plastic bushing from the shock plastic...
  • Page 26 ASSEMBLY OF THE WING ASSEMBLY OF THE TIRES AND WHEELS Check the hole spacing on the underside. 30270 Countersunk Plastic Washer 86062 X Equal Pin Tires 81095 Inner sponge 14150 86034 Body Clips Wheel 40083 Wing Apply instant glue into the groove of the wheel.
  • Page 27 SETTING GUIDE FRONT CAMBER ANGLE SETTING REAR CAMBER ANGLE SETTING Positive Negative Positive Negative Turnbuckle Turnbuckle Place the model car on flat surface. Raise the chassis to it's maximum clearance before the wheels leave the ground. Adjust the length of the front and rear upper arms so that the wheels are right angle to the ground.
  • Page 29 ASSEMBLY OF THE CLUTCH INTO ENGINE Notes: 10099 Non-Pull Start Engines... 3 x 5mm Screw • Alum. Washer behind the flywheel is not needed when using Force engines or similar types. O.S. Engines will require washer spacer. 10099 • To check!..place the brass corn against the engine bearing, then flywheel. You should be covering one or two thread of the engine shaft.
  • Page 30 ALIGN THROTTLE SERVO AND BRAKE SAME AS SHOWN ( Neutral Position ) Engine at idle ( Braking Position ) Brake is not on Brake is on Brake Adjust Nut ( Full Throttle Position ) Less Brake More Brake Engine at full throttle Loose Tighten * Tighten or loose the adjuster nut...
  • Page 31 Barrel Stop Screws - Used for adjusting Idle. Set for 1/16th inch gap to start new engines. You can open more for faster idle. USE LONG GLOW PLUG WITHOUT IDLE BAR, OFNA/PICCO #51007 IS RECOMMENDED OFNA RACING , 7 VANDERBILT, IRVINE, CA. 92618 • TEL:(949)586-2910...
  • Page 32 SCREW SET, 8 PCS 2.50 52190 2119/20 BARREL STOP BASE AND NUT 2.25 52990 FMW-1 CLIPS, “G”, 2 PCS. 1.95 52219 2121 BARREL STOP SCREW 2.25 52220 2122 LOW END NEEDLE 4.75 OFNA RACING , 7 VANDERBILT, IRVINE, CA. 92618 • TEL:(949)586-2910...
  • Page 33 • TROUBLE SHOOTING GUIDE PROBLEM CAUSE SOLUTION Fuel line not primed Fill fuel tank and pressurize tank by capping exhaust ENGINE WILL NOT START Glow plug will not heat(lite) Check glow plug battery heater or replace plug. Engine flooded, too much fuel Check carb.
  • Page 34 OFNA POWER STARTER SYSTEM Setting up Read instruction manual carefully. Open and remove kit. Place car on car stand or block, this enables free spinning / turning of wheels. Charge receiver battery, you should trickle charge your batteries overnight. Radio Check Check batteries make sure they are fully charged (batteries are low if light is flashing).
  • Page 35 Starting Procedures Glow Plug Check Make sure that the glow plug heater wire (white wire) is fastened down properly. If wire is not fastened all the way, there will be no spark, the car will not start. Use one copper washer (shim) on glow plug, the second is a spare.
  • Page 36 ULTRA MBX COMP RTR with AUTO START ULTRA MBX COMP RTR PARTS 10010 SHOES, 3 SHOE TYPE, CARBON BLACK, 3 PCS. 12.95 10011 SHOES, 3 SHOE TYPE, ALUM. CNC BLUE, LITE WEIGHT, 3 PCS. 24.95 10012 SHOES, 3 SHOE TYPE, ALUM. CNC PURPLE, MED. WEIGHT, 3 PCS.
  • Page 37 ULTRA MBX COMP RTR with AUTO START 30531 THROTTLE SPRING 2.95 30560 ANTENNA TUBE PROTECTER AND MOUNT 2.95 30620 BEARING, 7 x 19mm, 6 PCS. (DRIVE TRAIN) 29.95 30630 BEARING, 6 x 13mm, 12 PCS. (WHEEL HUBS) 59.95 30631 BEARING, 6 x 13mm, 2 PCS.
  • Page 38 ULTRA MBX COMP RTR with AUTO START 36743 6mm E-CLIP, SERVO SAVER, 6 PCS. 2.95 36744 METAL POSTS, SERVO SAVER, 2 PCS. 3.95 36750 SERVO SAVER CONNECTOR 6.95 36760 FRONT PLATE JOINT 9.95 36850 7mm BALL, 6 PCS. 3.95 36880 5x60mm TURNBUCKLES 6.95...
  • Page 40 The registration card should be filled out and mailed to OFNA Racing within 10 days of purchase date. In the event that the kit is incomplete or component parts are broken due to error in manufacturer, contact your dealer from which you purchased the kit for replacement part or call OFNA at (949) 586-2910 for your nearest dealer location.

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