I have a question. I'm putting a new engine in my rider and don't know how to get the pully off the engine. When I try to turn the nut the motor turns. Probably something simple but my first time doing this. Thanks for any help. You can email me at calebays@aol.com if you'd like

You need an impact wrench or a piston stop. I would personally use an impact wrench because you can damage the piston with a piston stop.