The chain can stretch during use or may occasionally come out of adjustment. Regular attention to proper chain tension and lubrication will minimize the risk of the chain falling off the rear sprocket and help your scooter maintain optimum performance.
Properly adjusted, the chain should have 5-6mm (1/4″) of up-and-down travel or slack.
Currie Technologies® strongly recommends that any chain tension adjustment be performed by a trained scooter or bicycle mechanic.
300, 4.0 and 400 SERIES SCOOTERS
Adjusting the chain tension is performed by moving the rear wheel back and forth in the frame.
1. Loosen the rear axle nuts (left and right) using a 15mm wrench but do not remove.
2. Loosen the band brake arm fixing bolt, using a 5mm hex key wrench and an 8mm box wrench, but do not remove.
3. Adjust the belt tensioners on both sides of the frame equally to keep the rear wheel properly centered in the frame and so that the chain has 5-6mm (about 1/4”) of up and down movement.
4. Tighten the brake arm fixing bolt.
5. Tighten the axle nuts (left and right).
6. Test the chain adjustment by rotating the rear wheel forward by hand a few revolutions while watching the chain. Be sure that the rear wheel is turning smoothly and the chain does not try to run off the rear sprocket in either direction.
7. Test the brake adjustment to be sure it is operating properly and make any necessary adjustments.
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