This is a belt drive for the stock motor. It is a 12/30 ratio, you will get a pinion and spur pulley with a belt, as well as one of our machined shafts with dual flat spots for the spur.
The belt drive kit will come with a shim kit for stock motors, which is required unless you you are using one of our motor mounts with the end cap for more adjustment. If you are using the end cap and motor mount you can order this belt drive without the shim kit.