Atomic BZ3 User manual

BZ3 Instruction manual
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Hold Diff Lock Nut by pliers
Diff Screw
Before assembling the Ball Diff, make a
thread to the lock nut first, by using the
diff screw.
Diff Rubber Pressure Collar
Insert the diff screw and rubber pressure collar
into the diff cup
Step 1 – Prepare the Diff Lock Nut
Step 1.1– Diff Assembly

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Insert the Bearing (3*6*2) to the pulley, and attach pulley to the
diff cup
Apply Ball Diff Grease the balls and
insert them to the diff pulley.
Insert the Bearing (6*10*3) to the drive cup
Apply ball diff grease to the cup and attach the diff plate.
Diff grease is act as the adhesive to hold the cup and plate
together.
Attention: the “D” Shape
Step 1.2– Diff Assembly
2.381mm balls

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Apply instant glue and fix the pulley ring.
Apply ball diff grease to the cup and attach the diff plate.
Diff grease is act as the adhesive to hold the cup and plate
together.
Step 1.3– Diff Assembly

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Step 1.4– Ball Diff Thrust Bearing
Apply thrust bearing grease to the ball-ring.
Attach the thrust bearing set to the cup
Use the diff tool to hold the diff lock nut,
And tighten the ball diff.
Diff lock nut

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Now build the second diff, repeat above
steps.
Attach the out-drive cup to the ball diff
body, and use the O-ring to secure the cup.
Install the 6*10*3 bearing.
Step 1.4– Ball Diff Assemble Finished

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3*6*2 bearing

M2*10 KM
M2*4 KM
2*5*2.5 bearing
3*6*2 bearing
Step 2.0– Motor Mount
Drive pulley
Step 3.0 - Bulkheads
M2*3
M2*3
M2*3
M2*4
M2*4
M2*4
Caution: 
For Front and Read Bulkheads, must use
M2*3 screw. CANNOT use M2*4mm.
M2*3

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Step 4.0 – Belt and Ball Diff
Caution:
Pay attention to the orientation of ball diffs
and belts
Step 5.0 –Fixing Belts

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Adjust the bearing hub position to adjust belt tension.
Middle position is a good start.
Step 6.0 – Upper Bulkheads
M2*4
M2*4
M2*5
M2*4
M2*5
M2*4

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M1.4 *4 screw is used to go thru the
cranks.
Step 7.0 – Steering Crank
SolidSteeringcrank(stock)
2.5 ball head
2.5 ball head
1.5*2.5*0.35
3*6*2
3*6*2
Step 8.0 – Steering Crank Support
M2*4
3*4*0.1 shim

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Video to show how to smooth ball links, please scan the QR code.
2.5 Ball Cap
2.5 Ball Cap
Normal Thread Side Reverse Thread Side
19mm Center to Center
Step 9.0 – Steering Linkages
Make 3 Linkages as above, approximately
19mm center to center long.
Fix the linkages as shown

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1
.
2
mm
T
r
im
Step 10 - Servo Mount
M2*4
M2*4
M2*4
M2*4 M2*4
2*6 rod
1.5*11 pin
3.5 ball cap
1.5*2.5*0.35 washer (2pcs)
Step 11 – Front Upper Arms

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Note:
1.5*2.5*0.35 white washer is used to adjust the Front Caster Angle (upper arm inclination).
More caster angle will generate more steering but degrease in stability. We recommend you
try different degree to find the best position for you.
Every 0.35mm move = 1-degree change of caster angle.
Step 11.1 – Front Upper Arms
M2*2.5 set screw
M2*2.5 set screw

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0 degree caster
1 degree caster
2 degree caster

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Caution:
If the Upper arm is not moving freely, please use sandpaper to grind the “tip of the ball head”. To remove
burr (or raised edge) of the plastic ball head.
Make sure the upper arm is moving freely.
Step 12 – Rear Upper Arms
M2*3
M2*3
M2*6 Rod
3.5 Ball Cap
Sandpaper (#500 to #1000)

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Step 13 – Rear Lower Arms
3.0 pivot ball
1.5*2.5*0.35 white spacer
1.5*13 pin
M1.2*4

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3 x 6 x 2 Bearing
3.5 Ball Head
Camber link Collar
3 x 6 x 2 Bearing
3.0 x 4.0 x 0.1 washer
Short CVD
2.0*7 pin Pin cover
Caution:
Apply 0.1mm washer 2 or 3 pcs (around
0.3mm), to minimize the play of the CVD and
bearing.
Step 14 – Rear Uprights

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Long CVD
3.0 x 4.0 x 0.1 washer
3.5 Ball Head
3.5 Ball Head 2.5 Ball Head
3 x 6 x 2 Flange Bearing
3 x 6 x 2 Flange Bearing
Caution:
Apply 0.1mm washer 2 or 3 pcs
(around 0.3mm), to minimize the
play of the CVD and bearing.
1.5 *12 pin
Left (L) arm
Step 15 – Front Knuckles

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O-ring (Rubber)
Steering Collar
M2 x 10
M2x4
M2x4
M2x4
M2x4
Pay attention to the
direction.
Step 16 – Spur Gear
Step 17 – Upper Deck

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M2x4
4.0mm
4.0mm ball head
M2x4
M2x4
M2x6
M2x6
M2x4
M2x4
4.0mm ball head
Step 18.1 – Front Shocks
Step 18.2 – Rear Shocks