The key slot for the motor and pulley is 140 and the key of the motor should be long
Or directly to the one end of the belt pulley longer (but this is a piece of diameter is slightly less than the diameter of belt pulley), make it with a "spacer", one of the pulley, the inside of the pulley keyway to do a long can
If the pulley is narrower than the shaft of the motor shaft, it can be added to the shoulder area of the pulley
The keyway of the motor is usually longer, and this doesn't affect your assembly. In general, the belt wheel is usually attached to the shaft of the motor shaft.
