How do I remove and change the roller belt variator of the BMW C600 and C650?

- Categories : Tutorial

How can you improve and increase the performance and acceleration of your BMW C600 and C650? It is necessary to equip yourself with the Easyboost tool spanners which are essential for dismantling the variation of your maxiscooter. This will allow you to easily change the rollers, the variator, the belt, the clutch, the clutch springs and the thrust spring.

Necessary tools:

  • Ratchet or torque spanner with sockets
  • Torx spanners 25, 30, 40

Duration of the operation :1 hour

Dismantle the right rear fairings of the BMW C600-C650

Unscrew all the screws with a 25 mm Torx spanner so that the fairings covering the soundproofing and variator cover can be removed. Remove the footrest support.

Dismantle the right rear fairings of the BMW C600-C650

Dismantle the soundproofing cover.

Unscrew all the screws with a 30 mm Torx spanner so that the soundproofing cover can be removed and the variator cover can be accessed.

Dismantle the soundproofing cover.

Remove the variator cover

Unscrew all the screws with a 30 mm Torx spanner so that the variator cover can be removed and the variator can be accessed.

Remove the variator cover

Removing the variator from the BMW C600 and C650

Place the Easyboost tool on the variator to lock it. Unscrew the shaft nut using the second Easyboost spanner or the ratchet with a 34 mm socket.

Removing the variator from the BMW C600 and C650

Removing the variator from the BMW C600 and C650

The variator can now be easily removed, together with the variator cap, rollers and hub.

Removing the variator from the BMW C600 and C650

Dismantle the clutch-torque drive assembly from the BMW C600 and C650.

Place the Easyboost spanner on the torque drive to lock it in place. Unscrew the shaft nut from the shaft using the pawl with a 34 mm bush (clockwise as the pitch is reversed).

Dismantle the clutch-torque drive assembly from the BMW C600 and C650.

Take out the clutch torque drive and remove the belt from the BMW C600 and C650.

Then the torque drive-clutch-belt assembly is removed. The latter is easily released from the torque drive.

Take out the clutch torque drive and remove the belt from the BMW C600 and C650.

Loosen the clutch nut.

Before loosening the clutch nut, a mark is made on the felt pen so that it can be tightened again in the same original position. To easily remove the clutch nut, use the Easyboost tools. First, loosen the clutch nut by 1/4 turn with the Easyboost spanner and the open-end spanner by tapping it with a hammer.

Loosen the clutch nut.

Inserting the tool to release the clutch nut

Once the nut has been released, the push spring disassembly tool is inserted following the instructions in the manual. This operation will allow the clutch nut to be released by exerting a slight pressure on the thrust spring. Caution: As the clutch is already in the end position, no attempt should be made to compress the spring any further.

Inserting the tool to release the clutch nut

Remove the clutch nut from the torque drive.

The nut can now be removed by hand as the clutch no longer exerts pressure on it.

Remove the clutch nut from the torque drive.

Releasing the thrust spring

All that remains to be done is to unscrew the axle nut to gradually release the spring without risk.

Releasing the thrust spring

Changing the BMW C600-C650 thrust spring

The spring is disassembled, it can now be replaced by a new and/or harder model to increase torque and recovery.

Changing the BMW C600-C650 thrust spring

Compressing the BMW C600-C650 thrust spring

For reassembly, the operation is repeated in reverse order. The tool is put back in place to compress the thrust spring.

Compressing the BMW C600-C650 thrust spring

Tightening the clutch nut

Repeat the same procedure as for disassembly, inserting the tool for locking the torque drive. Using the open-end spanner, tighten the clutch nut until the previously drawn marks are aligned.

Tightening the clutch nut

Mounting direction of the belt of BMW C600-C650

The arrows on the belt indicate the direction of rotation of the motor.

Mounting direction of the belt of BMW C600-C650

Install the torque drive and belt

Insert the belt into the torque drive and mount the assembly on the shaft.

Install the torque drive and belt

Mount the variator, hub, cap and rollers.

Insert the variator, hub, cap and rollers on the shaft.

Mount the variator, hub, cap and rollers.

Tighten the variator nut to the torque recommended by the manufacturer.

The variator nut must be tightened to a torque of 100 Nm +/- using the Easyboost lock spanner and a torque spanner with a 34 socket. Do not forget to fold down the safety washer.

Tighten the variator nut to the torque recommended by the manufacturer.

How do I reverse the tightening direction of the torque spanner (not reverse)?

To tighten the nut of the torque drive in the reverse direction, it is necessary to turn the end of the torque spanner. To do this, unscrew the torque spanner plate, turn the tip over and then replace the plate with the 2 screws.

How do I reverse the tightening direction of the torque spanner (not reverse)?

Tighten the nut of the torque drive to the torque recommended by the manufacturer.

After reassembling the variator housing, the nut of the torque corrector can be tightened to 100 Nm.

Tighten the nut of the torque drive to the torque recommended by the manufacturer.

Refit the variator cover

All that remains to be done is to tighten all the screws on the dimmer cover before refitting the soundproofing cover.

Refit the variator cover

Refit the soundproofing cover.

Tighten all the screws of the soundproofing cover before refitting the fairings.

Refit the soundproofing cover.

Refit the fairings

All that remains to be done is to tighten all the fairing screws and refit the footrest support to complete the operation.

Refit the fairings


For more details, we invite you to watch the YouTube video tutorial made by one of our clients :

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