When I was trying to start my buggy last weekend the spin start torqued it hard enough to make the buggy move forward, that is how I figured out my clutch was blown. Now that I have replaced the whole clutch assembly it still does it. I can't figure this out, anyone have any ideas?

Gotta start with the basics first... Take the motor out and make sure the clutch spins free. The only way the motor can transfer any sort of power to the buggy and make it move is through that clutch. Something is fubar with the clutch. I was help a guy with his LST at the track which was doing the same thing. His bearings were seized and stuck to the crankshaft causing the clutchbell to spin. So you've either got bad bearings or the thing is shimmed wrong and the crankshaft bolt is pinching down on the bearing not allowing it to spin free.