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How to Adjust a Loose Chain on a Underbone Motorcycle?

2 Answers

Val

09/08/25 4:08am

Lift the motorcycle using the main stand, and use an adjustable wrench to loosen the large nut counterclockwise. Use a wrench to loosen the adjusting bolt lock nut, adjust the adjusting bolt to achieve proper tightness, ensure both sides are aligned to the same scale, then tighten the adjusting bolt lock nut, and finally tighten the axle large nut.

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OReid

09/20/25 2:52am

I've been riding a step-through motorcycle for several years, and a loose chain is a pretty common issue. When this happens, I first find a flat spot to park and turn off the engine to ensure safety. Then, I measure the chain sag with my foot—the normal range is about 10 to 20 millimeters. If it's too loose, I loosen the nuts on both sides of the rear axle and adjust the tensioning nuts on both sides to gradually tighten the chain, avoiding misalignment. While adjusting, I check the alignment marks to ensure the wheel stays parallel. After tightening the nuts, I take a short test ride to listen for any unusual noises or vibrations. A chain that's too loose not only accelerates wear but can also slip or snap, which is especially dangerous on long trips. I recommend regular inspections, as chains tend to loosen after riding in rain or mud. Lubricating the chain every 500 kilometers can extend its lifespan and save you from costly repairs. Simple maintenance like this ensures a smooth and safe ride.

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