What causes the motorcycle speedometer to stop working?

[Bella]

Possible causes include damage to the odometer cable or speedometer gear. Reasons for the needle not moving: The mechanical speedometer has a relatively simple structure, mainly composed of the instrument panel, odometer cable, and speedometer gear. If the speedometer malfunctions, it is usually caused by damage to the odometer cable or speedometer gear. Solutions: Remove the speedometer cable fixing nut under the speedometer and pull out the speedometer cable. Then lift the front wheel and rotate it to see if the speedometer cable rotates with it. If it rotates, it indicates a problem with the instrument panel, possibly due to a broken or loose reduction gear inside the panel. This is more troublesome because individual speedometer panels are not sold separately, and the entire assembly must be replaced. If it does not rotate, it means the speedometer cable may be broken or the counting claws inside the front axle are excessively worn. In this case, simply take it to an after-sales service for repair. Open the front handle cover (headlight cover) and check if the screw cap at the speedometer port is loose or missing. Tightening it should resolve the issue.