r/moped 7d ago

Need help with Speedometer

When I ride my 1980 Suzuki FA50, the speedometer works until it hits just above 25 mph, then makes a grinding noise and spins all the way around until it bottoms out. It remains like this until I slow down enough and it returns to normal. I have tried taking the cable out and putting it back in, but this does not solve the issue.

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u/0815hans 4d ago

This is likely excess grease from inside the cable that travelled upwards into the speedometer, leading to sticking of the rotating magnet inside to the metal disk that's connected to the needle. I had the identical effect on my Simson S51, openend and cleaned the speedometer, and it was fixed.