Everything is finally getting close to being finished on the rebuild. However, when we put a battery in and tried to turn the motor over, the starter just spun itself. I don't understand how this could be? We tried troubleshooting the obvious culprits (ground, power, etc.) I even pulled the starter out and had it tested (it's in perfect working condition). I don't think the starter is contacting the flywheel for some reason. Does anyone know why this could be? The flywheel is aftermarket lightweight.