Tongshen 48v 500w motor starts slipping when i change gear

[Jason130670]

hiya all i have just fitted a 500w 48v tongsheng to my bike done 130mile and now the motor has started to slip when i change gear, if i stop pedaling then start again it works ok i have stripped the motor to see if i can see anything inside sticking but all seems fine

 

[amberwolf]

If this is a geared hubmotor, it's probably the clutch inside the motor. If so, you'd need to replace that. If the place you bought from doesn't cover it under warranty, and doesn't have spare parts, you'd have to find a seller of the clutch (which may come with the gears, or may be by itself).

If this is a middrive, it's probably the one-way bearing inside the motor/crank section, with the same solution sources.