From Unofficial Zero Manual
While moving, the motor tends to make a solid smooth tone resonant with the motor's rotational speed.
- Related Confirming Symptoms
- Typically, this occurs while the motorcycle is traveling at speeds above 10mph.
- Most noticeable between 15-30mph (30-50kph).
- The motor shaft bearings are likely the primary generator of this resonant noise.
- None; this is normal and expected.