Jconcepts BJ4 Worlds Edition Manual
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Jconcepts BJ4 Worlds Edition Manual

2005-2006 ifmar world champion 1:10th scale electric
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  • Page 2: Chassis Components

    TOOLS NEEDED TO BUILD THIS KIT TOOLS 3. MISC. TOOLS 1. ALLEN WRENCHES ITEMS NEEDED TO COMPLETE YOUR CAR: A. NEEDLE NOSE PLIERS A. .050" 1. R/C TWO CHANNEL SURFACE B. THREAD LOCKING COMPOUND (BLUE) B. 1/16" FREQUENCY RADIO SYSTEM C.
  • Page 3 CHASSIS COMPONENTS BAG B 5-40 x 5/16" #4 WASHER, 4-40 MINI 4-40 x 5/16" 4-40 x 5/16" 4-40 x 3/8" FLAT HEAD ALUMINUM LOCKNUT FLAT HEAD SOCKET HEAD FLAT HEAD CENTER MOTOR CENTER BULKHEAD FRONT BULKHEAD CENTER BULKHEAD BATTERY POST MOUNT x 1 CAP x 1 REAR SUSPENSION MOUNT (FRONT) x 1...

  • Page 4: Slipper Assembly

    BAG B CENTER SLIPPER PARTS SLIPPER OUTDRIVE SLIPPER OUTDRIVE DIFF BOLT DIFF THRUST WASHER SLIPPER SPRING DIFF T-NUT FEMALE x 1 MALE x 1 78 TOOTH SPUR GEAR SLIPPER PAD SLIPPER PLATE 3/8 X 5/8 BEARING OUTDRIVE SHIM STEP 1 SLIPPER ASSEMBLY: SLIPPER PLATE 1.
  • Page 5 SLIPPER ADJUSTMENT: STEP 3 COMPARE ASSEMBLY: 1. THE SLIPPER IS ONE OF THE MOST CRITICAL ADJUSTMENTS ON THE BJ4. REMEMBER, THE SLIPPER IS DESIGNED TO ABSORB IMPACTS FROM THE DRIVETRAIN. SETTING THE SLIPPER TOO TIGHT WILL ONLY CAUSE PREMATURE DAMAGE TO THE DRIVETRAIN. IN ADDITION, HAVING THE SLIPPER TOO LOOSE WILL NOT HELP CREATE TRACTION.
  • Page 6 BAG C DRIVETRAIN COMPONETS (DIFF x 2) 3/32 DIFF BALL DIFF BOLT 5/64 THRUST BALL OUTDRIVE SHIM DIFF THRUST WASHER 3/16 X 5/16 x 12 DIFF BEARING DIFF T-NUT DIFF SPRING SHORT OUTDRIVE HUB LONG OUTDRIVE HUB DIFFERENTIAL RING GEAR DRIVE RING THRUST BALL ASSEMBLY: STEP 1...

  • Page 7: 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 8 STEP 6 FINAL DIFF ASSEMBLY: 3/8 x 5/8 BEARING 1. SLIDE ONE OUTDRIVE SHIM AND ONE 3/8 x 5/8 BEARING ONTO EACH SIDE OF THE DIFF ASSEMBLY. OUTDRIVE SHIMS, SCALE: 1:1 VERY IMPORTANT 3/8 x 5/8 BEARING CENTER CVD BAG CENTER CVD COMPONENTS CVD COUPLING CVD CROSS PIN...

  • Page 9: Input Shaft Assembly

    BAG C INPUT SHAFT COMPONENTS * (E-CLIPS ARE LOCATED IN THE SHOCK BAG) DRIVE PINON 3/16 x 3/8 DOWEL PIN INPUT SHAFT SHIM SMALL E-CLIP* BEARING STEP 8 INPUT SHAFT ASSEMBLY: 1. SLIDE TWO INPUT SHAFT SHIMS AND TWO 3/16 X 3/8 BEARINGS ONTO THE INPUT SHAFT.

  • Page 10: Transmission Components

    BAG C TRANSMISSION COMPONENTS 8° FRONT TRANSMISSION HOUSING REAR TRANSMISSION HOUSING 4-40 x 3/8" 4-40 x 3/8" 4-40 x 3/8" 4-40 x 5/16" 4-40 x 1/8" FLAT HEAD BUTTON HEAD SOCKET HEAD BUTTON HEAD SET SCREW STEP 10 TRANSMISSION CASE ASSEMBLY: 1.

  • Page 11: Step 11 Transmission Assembly

    STEP 11 TRANSMISSION ASSEMBLY: 1. INSTALL THE FRONT AND REAR DIFF ASSEMBLIES IN THE LOWER TRANSMISSION CASES AS SHOWN BELOW. 2. INSTALL THE FRONT AND REAR INPUT SHAFT ASSEMBLIES AS 4-40 x 3/8" SHOWN BELOW. BE SURE TO INSERT THE DOGBONE END OF SOCKET HEAD EACH CVD ASSEMBLY INTO THE CENTER SLIPPER OUTDRIVE.

  • Page 12: Step 1 Steering Assembly

    BAG D STEERING AND TOP DECK COMPONENTS SHORT STEERING LONG STEERING STEERING 1/8 x 1/4 .030" NYLON STEERING POST BELLCRANK BELLCRANK BUSHING BEARING WASHER 4-40 x 1/4" 4-40 x 5/16" SHORT 4-40 x 1/4" 4-40 x 5/16" 4-40 x 3/8" 4-40 x 3/8"...
  • Page 13 STEP 2 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 MOUNT WHEN VIEWED FROM THE SIDE.
  • Page 14 STEP 3 TOP DECK ASSEMBLY: 1. INSERT TWO 1/8 X 1/4 BEARINGS INTO THE BEARING BLOCK ON THE CHASSIS. 2. SLIDE THE STEERING ASSEBLY INTO THE BEARINGS. 3. SLIDE ONE 1/8 X 1/4 BEARING ONTO THE TOP OF EACH STEERING POST. 4.
  • Page 15 CVD BAG FRONT CVD COMPONENTS 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 CVD BAG REAR CVD COMPONENTS CVD AXLE CVD COUPLING CVD SET SCREW CVD ROLL PIN CVD CROSS PIN...
  • Page 16 BAG E FRONT END COMPONENTS KING PIN 4-40 x 3/8" 4-40 x 1/4" 4-40 x 5/16" .030 ALUMINUM 4-40 MINI 2-56 x 1/8" BUTTON HEAD BUTTON HEAD SOCKET HEAD WASHER LOCKNUT BUTTON HEAD FRONT A-ARM PIVOT SLEEVE CASTER BLOCK STEERING BLOCK FRONT HINGE LEFT &...
  • Page 17 STEP 2 FRONT SUSPENSION ASSEMBLY: 1. INSERT BOTH PIVOT SLEEVES INTO THE FRONT BULKHEAD. 2. ALIGN THE FRONT A-ARMS WITH THE PIVOT SLEEVES AND PRESS THE FRONT INNER HINGE PINS INTO PLACE. 3. SLIDE THE FRONT HINGE PIN BRACE OVER THE FRONT INNER HINGE PINS UNTIL IT PRESSES AGAINST THE FRONT BULKHEAD.
  • Page 18 FRONT TURNBUCKLE ASSEMBLY: STEP 4 1. TWIST THE BALL CUPS ON TO EACH BLUE TITANIUM TURNBUCKLE UNTIL YOU GET THE DIMENSION SHOWN FOR 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 19: Rear Suspension Assembly

    STEP 2 REAR SUSPENSION ASSEMBLY: 4-40 x 5/16" 1. ATTACH THE REAR SHOCK TOWER WITH FOUR 4-40 x 5/16" SOCKET HEAD SOCKET HEAD SCREWS. (APPLY A SMALL AMOUNT OF THREAD LOCKING COMPOUND) (APPLY A SMALL AMOUNT OF THREAD LOCKING COMPOUND) 2.

  • Page 20: Shock Components

    SHOCK BAG SHOCK COMPONENTS 4-40 x 1/2" SHOCK SHOCK .030 TRAVEL E-CLIP ROLL 4-40 x 3/4" 4-40 PLAIN GOLD SOCKET HEAD LIMITER BUTTON HEAD WASHER BUSHING SMALL SHOCK SHOCK CAP SHOCK PISTON LARGE SHOCK SHOCK SNAP SHOCK SHOCK CAP SPACER #1, #2, #3 SPACER RETAINER...
  • Page 21 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 THE FOLLOWING STEPS COMPLETELY 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 22 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 THE FOLLOWING STEPS COMPLETELY BEFORE BEGINNING. 2. THREAD THE SHOCK EYELET 3.

  • Page 23: Shock Mounting

    STEP 3 SHOCK MOUNTING: 1. ATTACH THE BOTTOM OF THE FRONT SHOCKS TO THE OUTSIDE HOLES ON THE FRONT A-ARMS. USE THE 4-40 x 1/2" SOCKET HEAD SCREWS WITH A GOLD WASHER ON EACH. 2. ATTACH THE BOTTOM OF THE REAR SHOCKS TO THE INSIDE HOLES ON THE REAR A-ARMS. USE THE 4-40 x 1/2"...

  • Page 24: Miscellaneous Components

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

  • Page 25: Miscellaneous Assembly

    STEP 3 MISCELLANEOUS ASSEMBLY: 1. ATTACH THE SERVO MOUNTS TO YOUR SERVO BY USING FOUR 4-40 x 3/8" BUTTON HEAD SCREWS WITH A GOLD WASHERS ON EACH. CHECK THE ALIGNMENT OF YOUR SERVO WITH THE SUPPLIED MOUNTS. SOME SERVOS REQUIRE SPACERS IN FRONT OF THE ACTUAL SERVO MOUNTS. TYPICALLY, AIRTRONICS SERVOS WILL REQUIRE THE THICK SERVO MOUNT SPACERS.
  • Page 26 STEP 4 MISCELLANEOUS ASSEMBLY: 1. ATTACH THE REST OF YOUR ELECTRICAL TO THE CHASSIS USING THE INCLUDED SPEED CONTROL AND RECEIVER TAPE. KEEP IN MIND THAT THE GRAPHITE CHASSIS AND TOP DECK ARE VERY CONDUCTIVE. IT IS RECOMMENED THAT YOU PUT TWO LAYERS OF SPEED CONTROL AND RECEIVER TAPE UNDER YOUR ELECTRONICS.

  • Page 27: Motor Installation

    ARE INCLUDED FOR YOUR CONVENIENCE. BE SURE TO USE A PAINT THAT IS SPECIFICALLY FORMULATED TO ADHERE TO LEXAN. 2. CUT OUT THE BJ4 WORLDS EDITION BODY ALONG THE CUT LINES ON THE BODY USING LEXAN SCISSORS. NEXT, DRILL OUT THE LOCATIONS FOR THE BODY MOUNTS AND ANTENNA. MOUNT THE BODY USING THE INCLUDED BODY CLIPS.
  • Page 28 CHASSIS TAPE INSTALLATION SHOWN WITHOUT FRONT BUMPER ELECTRICAL LAYOUT ELECTRICAL LAYOUT ELECTRICAL LAYOUT BATTERY PACK WITH JUMPER WIRE OVER TOP DECK PAGE 29...

  • Page 29: Final Adjustments

    BJ4 WORLDS EDITION SPECIFICATIONS Wheel Base: 10.94” (278mm) Vehicle Width: 9.65” (245mm) Weight (ready to run): 3 lbs. 7.6 oz. (1575g) Internal gear ratio: 2.50:1 Front bulkhead kick-up: 8 degrees Front castor blocks: 10 degrees Standard rear hub carrier toe-in:...
  • Page 30 Battery Pack Assembly: Here is the preferred way to assemble battery packs for the BJ4 Worlds Edition. Solder the individual cell connections as shown. Team racers prefer battery bars for sturdier connections.

  • Page 31: Maintenance

    MAINTENANCE Suspension Maintenance: You should periodically check all the moving parts: front and rear end, suspension arms, steering blocks, steering linkage, shocks, and so on. If any of these should get dirty or bind, then your car’s performance will suffer. Motor Maintenance: Between runs, inspect the brushes to ensure they are moving freely in the brush holder.
  • Page 32 Front Camber Links: Changing the length of the camber link is considered a bigger step than adjusting the ball end height on the top deck. Shortening the camber link (or lowering the ball end) will give the front end less roll and quicken steering response. Lengthening the camber link (or raising the ball end) will give the front more roll and slower steering response.
  • Page 33 Ride Height: Ride height is the distance from the ground to the bottom of the chassis. Check the ride height by lifting the entire car about 8-12 inches off the bench and dropping it. After the suspension “settles” into place, raise or lower the ride height by threading the collars up or down on the shock bodies.

  • Page 34: Shock Settings

    SHOCK SETTINGS Front Shock Position: Moving the top of the shocks in will make the suspension softer, slow steering response, and make the car smoother through the bumps. Moving the top of the shocks out will make the suspension stiffer, increase steering response, and make the car react quicker. The standard location (center hole on the tower) works well for most tracks.

  • Page 35: Tire Selection

    TIRE SELECTION Tire selection should be based on track conditions and will greatly affect your car’s performance. In general, tires with large spikes should be chosen for tracks with loamy, fluffy, or wet dirt. Soft compound tires with small pins should be used for hard-packed, dusty, or slick tracks. Hard-packed, high-bite, abrasive (blue groove) tracks require tires with small pins and a slightly harder compound.
  • Page 36 How to Read the Tire Guide: Tire Grading: A=Excellent B=Good C=Fair ( - ) not recommended Looking at the chart for 4wd Blockhead, for dry, from left to right; it is not recommended in Pink (P) compound, it is "good" in the Red (R) compound, and is considered "fair" in the Silver (S) compound.

  • Page 37: Setup Sheets

    SETUP SHEETS The best way to get your car handling right is to go to our website, www.jconcepts.net, and click on the links under BJ4 products. There, you can find setup sheets for different tracks and conditions from our team drivers. You can look for track conditions and tires that are similar to your local track, and mimic that setup.
  • Page 38 JC 1004 JC 1100 JC 1100HD6 AE 6473 AE 6472 AE 6338 TL A-4221 AE 7336 TL A-4221 AE 1410 JC 1117 JC 1012 JC 1102 JC 1039 AE 6271 AE 6273 AE 2330 JC 1030 AE 6582 3/8 x 5/8 JC 1102 AE 6575 AE 3911...
  • Page 39 3____ BJ4 WORLDS EDITION SET-UP SHEET: NOTES: 2____ DRIVER 1____ DATE TRACK/CITY EVENT SHOCK SETTINGS: TRACK CONDITIONS: PISTON_____ SOFT SURFACES: HARD SURFACES: LIMITING____ A (INSIDE)________ SAND / SOIL SHAFT______ LOAMY HARD SLICK B (OUTSIDE)______ RUTS ABRASIVE OIL_________ WASHERS________ BLUE GROOVE...

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