Why is there a noise when the rear wheel of the scooter rotates?
2 Answers
The abnormal noise from the rear wheel of the scooter could be due to a damaged rear wheel bearing, but it might also be caused by long-term wear of the pulley sleeve. However, the noise caused by the latter should not be very loud. If the issue lies with the pulley, it can only be resolved by replacing it with a matching part of the same model. It's best not to use automotive engine oil in motorcycles, as their engine speeds and temperatures differ. However, for small-displacement motorcycles with low usage intensity and load, using it doesn't present any significant problems.
I encountered a similar situation during my last car repair. There are several common causes for rear wheel noise. The most likely is worn wheel bearings, which often happens after prolonged use, producing a humming or clunking sound when rotating. Another possibility is an issue with the rear brake system, such as excessively worn brake pads or sand getting in, causing a squeaking noise during friction. It could also be due to a slipping or aged/cracked drive belt, especially noticeable during sudden acceleration. I recommend first checking if the tire pressure is normal to rule out uneven tire wear. If the vehicle has been ridden for over three years, there's an 80% chance you'll need to open it up and check if the gearbox oil has deteriorated. If these steps don't resolve the issue, it's best to consult a professional mechanic as soon as possible, since wheel problems can affect safety.
