Jconcepts BJ4 Manual
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Jconcepts BJ4 Manual

1:10th scale electric 4wd off-road competition buggy kit
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Summary of Contents for Jconcepts BJ4

  • Page 2: Chassis Preparation

    TOOLS TOOLS NEEDED TO BUILD THIS KIT: 3. MISC. TOOLS 1. ALLEN WRENCHES ITEMS NEEDED TO COMPLETE YOUR CAR: A. NEEDLE NOSE PLIERS A. .050" 1. R/C TWO CHANNEL SURFACE FREQUENCY RADIO SYSTEM. B. THREAD LOCKING COMPOUND (BLUE) B. 1/16" 2.

  • Page 3: Tools Used

    BAG B HARDWARE INSIDE BAG "B" SCALE: 1:1 FRONT BULKHEAD MOTOR MOUNT 4-40 x 3/8" FLAT HEAD 4-40 x 5/16" FLAT HEAD REAR SUSPENSION MOUNT (FRONT) x 1 4-40 MINI LOCKNUT 5-40 x 5/16" FLAT HEAD NOTE MOUNTING DIRECTION IN DRAWING BELOW REAR SUSPENSION MOUNT (BACK) x 1 NOTE MOUNTING DIRECTION IN DRAWING...
  • Page 4 1. 5/64" ALLEN WRENCH BAG C DRIVETRAIN COMPONETS (DIFF x 2) TOOLS USED 2. NEEDLE NOSE PLIERS SCALE: 1:1 3/32 DIFF BALL DIFF BOLT 5/64 THRUST BALL OUTDRIVE SHIM DIFF THRUST WASHER 3/16 X 5/16 DIFF x 12 BEARING x 2 DIFF T-NUT DIFF SPRING SHORT OUTDRIVE HUB...

  • Page 5: Diff Assembly

    STEP 3 DIFFERENTIAL RING GEAR: 1. TRIM ANY BURRS FROM THE INSIDE OF THE GEAR WITH A HOBBY KNIFE. SHORT HUB ASSEMBLY 2. ADD A GENEROUS AMOUNT OF STEATLH DIFF LUBE TO THE RING GEAR BALL HOLES AND PUSH IN THE TWELVE 3/32 DIFF BALLS. THEN PUSH IN THE LUBE THAT CAME OUT.
  • Page 6 STEP 6 FINAL OUTDRIVE ASSEMBLY: 3/8 X 5X8 BEARING 1. PRESS ONE OUTDRIVE SHIM ON THE LONG HUB. (NOTE CORRECT DIRECTION ON DRAWING) 2. PLACE ONE 3/8 X 5/8 BEARING OVER EACH OUTDRIVE HUB. SCALE: 1:1 OUTDRIVE SHIM VERY IMPORTANT 3/8 x 5X8 RUBBER SEALED BEARING BAG C...
  • Page 7 TOOLS USED REAR INPUT SHAFT BAG CONTENTS BAG C 1. 1/16" ALLEN WRENCH * (E-CLIPS ARE LOCATED IN THE SHOCK BAG) 2. 7/16" OPEN END WRENCH 3. NEEDLE NOSE PLIERS 4-40 X 3/16" SMALL C-CLIP SLIPPER THRUST *SMALL E-CLIP INPUT SHAFT SHIM 3/16 X 3/8 RUBBER BUTTON HEAD SCREW RETAINER...
  • Page 8 STEP 10 REAR INPUT SHAFT/SLIPPER ASSEMBLY: 1. SLIDE ONE BEARING AND TWO INPUT SHAFT SHIMS ONTO THE SLIPPER SHAFT. 2. INSTALL AND CENTER A DOWEL PIN INTO THE SLIPPER SHAFT. 3. SLIDE A DRIVE PINON ONTO THE END OF THE INPUT SHAFT. MAKE SURE THE DOWEL PIN ALIGNS PERFECTLY WITH THE SLOT IN THE PINION.
  • Page 9 STEP 12 FRONT TRANSMISSION ASSEMBLY, LOWER HALF: 1. ATTACH THE LOWER FRONT TRANSMISSION HOUSING TO THE CHASSIS AND FRONT BULKHEAD USING TWO 4-40 x 5/16" BUTTON HEAD SCREWS IN THE FRONT AND TWO 4-40 x 3/8" FLAT HEAD SCREWS IN THE BACK. 4-40 x 3/8"...
  • Page 10 STEP 15 REAR TRANSMISSION ASSEMBLY: 1. UNBOLT THE MOTOR MOUNT FROM THE CHASSIS WHERE IT WAS LOOSELY ATTACHED IN CHASSIS ASSEMBLY STEP 1. 2. SLIDE THE SLIPPER SHAFT ASSEMBLY THROUGH THE BACKSIDE OF THE MOTOR MOUNT. SLIDE ONE 3/16 x 3/8 BEARING ONTO THE SLIPPER SHAFT, MAKING SURE IT SETS NICELY INTO THE COUNTERBORED SIDE OF THE MOTOR MOUNT.
  • Page 11 STEP 17 COMPARE TRANSMISSION ASSEMBLY STEP 18 REAR TRANSMISSION ASSEMBLY: 4-40 x 3/8" SOCKET HEAD 1. ATTACH THE UPPER TRANSMISSION CASE TO THE LOWER TRANSMISSION CASE WITH FOUR 4-40 x 3/8" SOCKET HEAD SCREWS AND TWO 4-40 x 3/8" BUTTON HEAD SCREWS. 4-40 x 3/8"...
  • Page 12 STEP 19 COMPARE DRIVETRAIN ASSEMBLY BAG D TOOLS USED STEERING AND TOP DECK COMPONENTS 1. 1/16" ALLEN WRENCH 2. NEEDLE NOSE PLIERS 3. 3/16" NUT DRIVER 1/8 x 1/4 .030 NYLON STEERING STEERING POST LONG STEERING SHORT STEERING BEARING WASHER BUSHING BELLCRANK BELLCRANK...

  • Page 13: Step 1 Steering Assembly

    STEP 1 STEERING ASSEMBLY: 1. THREAD BOTH STEERING POSTS INTO THE STEERING BELLCRANKS AS SHOWN. NYLON (APPLY A SMALL AMOUNT OF THREAD LOCKING COMPOUND) 2. SLIDE ONE .030" NYLON WASHER ONTO THE TOP OF EACH STEERING POST. 3. SLIDE ONE .030" ALUMINUM WASHER ON TO A SHORT BALL END AND FASTEN IT TO THE LONG BELLCRANK AS SHOWN.

  • Page 14: Top Deck Assembly

    STEP 4 COMPARE STEERING AND CHASSIS ASSEMBLY STEP 5 TOP DECK ASSEMBLY: 1. ATTACH THE FRONT TOWER MOUNT USING TWO 4-40 x 1/4" FLAT HEAD SCREWS. (APPLY A SMALL AMOUNT OF THREAD LOCKING COMPOUND) 2. CAREFULLY FILE THE LEADING EDGE OF THE TOP PLATE SO IT IS AT THE SAME ANGLE AS THE FRONT TOWER WHEN VIEWED FROM THE SIDE.
  • Page 15 STEP 6 TOP DECK ASSEMBLY: 1. ATTACH THE TOP DECK BY FIRST LINING UP THE BEARING BLOCK ON THE BOTTOM OF THE TOP DECK WITH THE TWO BEARINGS ON TOP OF THE STEERING POSTS. PRESS THE TOP DECK DOWN INTO PLACE. 2.
  • Page 16 CVD BAG FRONT CVD COMPONENTS TOOLS USED REMOVE THESE PARTS FOR THE FRONT CVD'S 1. .050" ALLEN WRENCH CVD ROLL PIN CVD CROSS PIN CVD SET SCREW BEARING SPACER CVD COUPLING CVD FRONT CVD FRONT BONE CVD FRONT AXLE CVD FRONT HEX WHEEL NUT TOOLS USED CVD BAG...
  • Page 17 BAG E TOOLS USED FRONT END COMPONENTS 1. .050" ALLEN WRENCH 2. 1/16" ALLEN WRENCH 3. 5/64" ALLEN WRENCH 4. NEEDLE NOSE PLIERS 5. 3/16" NUT DRIVER 4-40 MINI 2-56 x 1/8" 4-40 x 1/4" .030 ALUMINUM 4-40 x 3/8" SHORT KING PIN BUTTON HEAD...
  • Page 18 STEP 2 FRONT SUSPENSION ASSEMBLY: 1. USE REFERENCE ILLUSTRATION BELOW TO PREPARE THE TWO PIVOT SLEEVES. 2. INSERT BOTH PIVOT SLEEVES INTO THE FRONT BULKHEAD. 3. ALIGN THE FRONT A-ARMS WITH THE PIVOT SLEEVES AND PRESS THE FRONT INNER HINGE PINS INTO PLACE. 4.
  • Page 19 STEP 4 FRONT SUSPENSION AND REAR TOWER ASSEMBLY: 1. POSITION THE STEERING AND CASTER BLOCK ASSEMBLIES AS SHOWN AND SLIDE THE FRONT OUTER HINGE PINS INTO PLACE. 2. CAPTURE THE FRONT OUTER HINGES BY INSERTING A 2-56 x 1/8" BUTTON HEAD SCREWS INTO EACH A-ARM. 3.

  • Page 20: Rear Suspension Assembly

    BAG F TOOLS USED REAR END COMPONENTS 1. .050" ALLEN WRENCH 2. 1/16" ALLEN WRENCH 3. 5/64" ALLEN WRENCH 4. NEEDLE NOSE PLIERS 5. 3/16" NUT DRIVER HINGE PIN 1.O6" LONG BLACK 2-56 x 1/8" 4-40 MINI .030 NYLON (REAR OUTER) x 2 BALL END BUTTON HEAD LOCKNUT...
  • Page 21 STEP 3 REAR TURNBUCKLE ASSEMBLY: 1. TWIST THE BALL CUPS ONTO EACH BLUE TITANIUM TURNBUCKLE UNTIL YOU GET THE DIMENSION SHOWN FOR EACH EACH PART. 2. LOCATE THE NOTCH ON EACH TURNBUCKLE AND ROTATE THEM SO THAT IT IS LOCATED ON THE OUTSIDE OF THE CAR ON THE LEFT AND THE INSIDE ON THE RIGHT.
  • Page 22 1. 1/16" ALLEN WRENCH SHOCK BAG SHOCK COMPONENTS TOOLS USED 2. 3/32" ALLEN WRENCH 3. MOLDED WRENCH SET 4. HOBBY KNIFE 5. SHOCK TOOL SHOCK SHOCK PIVOT SHOCK 4-40 PLAIN GOLD 4-40 x 1/2" 4-40 x 1" 4-40 X 3/4" BUSHING BUSHING WASHER...

  • Page 23: Shock Assembly

    STEP 1 SHOCK ASSEMBLY: BUILD ALL FOUR SHOCKS USING THIS METHOD ATTENTION: BUILDING THE SHOCKS IS ONE OF THE MOST IMPORTANT PARTS OF THE KIT ASSEMBLY. PLEASE READ THROUGH EVERYTHING FIRST BEFORE BEGINNING. 1. BEGIN THE SHOCK ASSEMBLY BY FIRST TRIMMING EACH PART OFF THE SHOCK PARTS TREE. CAREFULLY TRIM EACH PART FROM THE PARTS TREE SO NO PART OF THE TWO MOLDING RUNNERS REMAIN.
  • Page 24 STEP 2 SHOCK ASSEMBLY: BUILD ALL FOUR SHOCKS USING THIS METHOD ATTENTION: BUILDING THE SHOCKS IS ONE OF THE MOST IMPORTANT PARTS OF THE KIT ASSEMBLY. PLEASE READ THROUGH EVERYTHING FIRST BEFORE BEGINNING. 1. INSTALL AN E-CLIP ON BOTH 2. THREAD ON THE SHOCK 3.

  • Page 25: Shock Mounting

    STEP 3 SHOCK MOUNTING: 1. MOUNT THE BOTTOM OF THE FRONT SHOCKS TO THE OUTSIDE HOLES ON THE FRONT A-ARMS USING THE 4-40 X 1" SOCKET HEAD SCREWS, WITH A GOLD WASHER ON EACH. MAKE SURE THE A-ARM SPACER IS IN POSITION ON THE A-ARM.

  • Page 26: Miscellaneous Components

    BAG G MISCELLANEOUS COMPONENTS 4-40 x 1/4" 4-40 x 3/8" 3mm x 10mm 4-40 x 3/8" SHORT 4-40 x 3/8" FLAT HEAD SOCKET HEAD SOCKET HEAD BUTTON HEAD BALL END SOCKET HEAD GOLD WASHER AE BODY CLIP TITANIUM SHORT SERVO MOUNTS SERVO MOUNT TURNBUCKLE BALL CUP...

  • Page 27: Miscellaneous Assembly

    MISCELLANEOUS ASSEMBLY: STEP 2 1. ATTACH THE SERVO MOUNTS TO YOUR SERVO BY USING FOUR 4-40 x 3/8" BUTTON HEAD SCREWS WITH THE GOLD WASHERS IN PLACE. CHECK THE ALIGNMENT OF YOUR SERVO WITH THE SUPPLIED MOUNTS. TYPICALLY, AIRTRONICS, JR AND FUTABA SERVOS WILL USE THE THIN SERVO MOUNT SPACERS IN FRONT OF THE ACTUAL SERVO MOUNTS.
  • Page 28 AXLES USING THE STANDARD 8-32 LOCKNUTS. SPEED CONTROL AND RECEIVER CAN BE MOUNTED WING MOUNT THE WAY SHOWN, OR FLIPPED SPACERS AROUND WITH THE SPEED CONTROL BJ4 ILLUZION WING NEXT TO THE SERVO. LARGE STYLE BODY CLIPS (LOSI) 3mm x 10mm SOCKET HEAD SCREWS...
  • Page 29 STEP 4 BODY TRIMMING AND COMPLETED ASSEMBLY: 1. CUT OUT THE BJ4 BODY ALONG THE CUT LINES USING LEXAN SCISSORS. THEN DRILL OUT THE LOCATIONS FOR THE BODY MOUNTS. MOUNT THE BODY USING THE INCLUDED LARGER STYLE BODY CLIPS (LOSI).
  • Page 30 JC 1000SD JC 1000HD JC 1000 JC 1004 AE 6473 AE 6472 JC 1035 TL A-4221 AE 6338 AE 7336 AE 6271 TL A-4221 JC 1039 JC 1012 JC 1035 AE 3919 AE 6273 JC 1022 TL A-4221 JC 1021 TL A-3124 AE 3919 JC 1020...
  • Page 31 3:_______ NOTES: J-CONCEPTS BJ4 SET-UP SHEET: 2:_______ 1:_______ DRIVER: DATE: TRACK/CITY: ONE-WAY:_____ EVENT: DIRECT:_____ WASHERS:_____ PISTON:________ CONDITIONS: LIMITING:______ SMOOTH: BUMPY: SHAFT:________ LOW TRACTION: 3:_____ MED TRACTION: A (INSIDE):_____ OIL:___________ HIGH TRACTION: WET: B (OUTSIDE):_____ SPRING:_______ DRY: 2:_____ SANDY: WASHERS:_____ SOFT DIRT:...

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