Why does a scooter vibrate heavily at 40-60 mph?

[OHaley]

Scooters tend to experience noticeable vibrations when traveling at speeds between 40-60 km/h. This occurs because the engine vibration frequency overlaps with the vehicle's natural vibration frequency, creating resonance. While resonance cannot be completely eliminated, prolonged driving at this speed range should be avoided. For scooters, factors such as excessively loose or tight engine and mounting bracket screws, worn/damaged/loose rubber bushings on the mounting brackets or shock absorbers, excessive gaps, faulty shock absorbers or frames, as well as poor design or manufacturing quality can all contribute to increased vibration. If the vibration is particularly severe, you can inspect the engine and mounting bracket fastening screws, rubber bushings, shock absorbers, tires, etc. If all these components are normal, there may not be much that can be done, as the issue could stem from inherent quality, design, or manufacturing defects in the scooter itself.