- Check that the motor wheel is mounted in the correct direction
- Then check that the brakes are properly adjusted and are not touching the rim.
- Next check if the motor casing is touching the forks. If it is, you need to increase the gap between the forks to fix this. The best way is to add a washer to the axle as shown below.
4. Alternatively, move the torque washer to the inside of the forks and use in place of a new washer.