My briggs push lawnmower is running rough and the pull cord snaps back after I hit something. So I removed the flywheel and key. The key was fine and I re- aligned the flywheel there is no wobble in the blade. It still run rough with out any power. I am not sure what to try next.

John

My briggs push lawnmower is running rough and the pull cord snaps back after I hit something.

Explain this statement.