Yeah, I was going to suggest checking the dizzy to be sure you're at TDC on no. 1, and not 180 degress off. Another thing to be sure of is that the engine is grounded properly to the body and frame. Simple things first, it helps to have a volt meter and check for power at the coil and dizzy. IF those have spark and you have fuel, the motor should fire. IF the timing is way off, you can bend valves and do some damage. Hope it's just a simple ground or unplugged wire. Good Luck, JSM84