Atomic BZ3 Instruction Manual

BZ3 Instruction manual

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BZ3 Instruction manual

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Step 1 – Prepare the Diff Lock Nut

Hold Diff Lock Nut by pliers

Before assembling the Ball Diff, make a

thread to the lock nut first, by using the

diff screw.

Diff Screw

Step 1.1– Diff Assembly

Diff Rubber Pressure Collar

Insert the diff screw and rubber pressure collar

into the diff cup

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Attention: the “D” Shape

Step 1.2– Diff Assembly

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.

Insert the Bearing (3*6*2) to the pulley, and attach pulley to the

diff cup

2.381mm balls

Apply Ball Diff Grease the balls and

insert them to the diff pulley.

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Step 1.3– Diff Assembly

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.

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BZ3 Instruction manual

Step 1.4– Ball Diff Thrust Bearing

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Attach the thrust bearing set to the cup

Apply thrust bearing grease to the ball-ring.

Use the diff tool to hold the diff lock nut,

And tighten the ball diff.

Diff lock nut

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BZ3 Instruction manual

Step 1.4– Ball Diff Assemble Finished

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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.

Now build the second diff, repeat above

steps.

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M2*10 KM



Step 2.0– Motor Mount

Drive pulley

2*5*2.5 bearing

3*6*2 bearing 3*6*2 bearing

M2*4 KM

Step 3.0 - Bulkheads

Caution: 

For Front and Read Bulkheads, must use

M2*3 screw. CANNOT use M2*4mm.

M2*4

M2*3

M2*4

M2*3

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Step 4.0 – Belt and Ball Diff

Step 5.0 –Fixing Belts

Caution:

Pay attention to the orientation of ball diffs

and belts

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Step 6.0 – Upper Bulkheads

M2*4

M2*5

M2*4

M2*5

Adjust the bearing hub position to adjust belt tension.

Middle position is a good start.

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BZ3 Instruction manual

Step 7.0 – Steering Crank

SolidSteeringcrank(stock)

1.5*2.5*0.35

2.5 ball head

3*6*2

2.5 ball head

3*6*2

M1.4 *4 screw is used to go thru the

cranks.

Step 8.0 – Steering Crank Support

3*4*0.1 shim

M2*4

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BZ3 Instruction manual

Step 9.0 – Steering Linkages

19mm Center to Center

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2.5 Ball Cap

Normal Thread Side Reverse Thread Side

2.5 Ball Cap

Make 3 Linkages as above, approximately

19mm center to center long.

Fix the linkages as shown

Video to show how to smooth ball links, please scan the QR code.

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BZ3 Instruction manual

Step 10 - Servo Mount

M2*4

1.5*2.5*0.35 washer (2pcs)

2*6 rod

3.5 ball cap

1.5*11 pin

Step 11 – Front Upper Arms

1

im

mm

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Step 11.1 – Front Upper Arms

M2*2.5 set screw

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.

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BZ3 Instruction manual

0 degree caster

1 degree caster

2 degree caster

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BZ3 Instruction manual

Step 12 – Rear Upper Arms

M2*3

M2*6 Rod

3.5 Ball Cap

Sandpaper (#500 to #1000)

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.

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BZ3 Instruction manual

Step 13 – Rear Lower Arms

1.5*13 pin

M1.2*4

3.0 pivot ball

1.5*2.5*0.35 white spacer

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Step 14 – Rear Uprights

Short CVD

3.0 x 4.0 x 0.1 washer

Caution:

Apply 0.1mm washer 2 or 3 pcs (around

0.3mm), to minimize the play of the CVD and

bearing.

3 x 6 x 2 Bearing

3.5 Ball Head

Camber link Collar

3 x 6 x 2 Bearing

2.0*7 pin

Pin cover

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Step 15 – Front Knuckles

Caution:

Apply 0.1mm washer 2 or 3 pcs

Long CVD

(around 0.3mm), to minimize the

play of the CVD and bearing.

3.0 x 4.0 x 0.1 washer

3 x 6 x 2 Flange Bearing

3.5 Ball Head

3 x 6 x 2 Flange Bearing

3.5 Ball Head

2.5 Ball Head

1.5 *12 pin

Left (L) arm

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Step 16 – Spur Gear

O-ring (Rubber)

Step 17 – Upper Deck

M2x4

Pay attention to the

direction.

M2x4

M2 x 10

Steering Collar

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Step 18.1 – Front Shocks

M2x4

4.0mm

M2x4

4.0mm ball head

Step 18.2 – Rear Shocks

M2x4

M2x6

M2x4

M2x6

4.0mm ball head

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Step 19 – Body Mounts

M2x4

Left Body Mount

M2x4

Right Body Mount

M2x4

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Install the

Front Body Mount

Caution:

Not included

Trim this part to avoid the touch of front belt

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BZ3 Instruction manual

Step 20 – Gear Ratio

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Spur

3500KV : around 4.3 ~ 4.6

5500KV : around 5.2 ~ 5.5

1.69

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13 14 15 16 17 18 19 20 21



7.54 7.00 6.53 6.13 5.77 5.45 5.16 4.90 4.67

Motor Gear (pinion)

6.76 6.31 5.92 5.57 5.26 4.98 4.73 4.51

Recommend Gear ratio for Atomic Motors:

5.70 5.37 5.07 4.80 4.56 4.35

7000KV : around 5.8 ~ 6.2

Gear ratio decision is affected by strength of battery, chassis weigh and overall smoothness of

the transmission system also the size of the track.

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