- 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 - can you see the gap at the bottom?
4. Alternatively, move the torque washer to the inside of the forks and use in place of a new washer.