I had a wizard riding mower gave to me and the man who had it hit a big cluck of dirt and it stopped running.It turns over really good but just will not start.Please help as I no nothing about mowers.The model number is AYP7143B69.Thank you Billy

May have sheared the flywheel key. Remove the blower housing, remove the "chopper" screen from the top of the engine, remove the nut and check to see if the groove in the crankshaft and the groove in the flywheel line up.

I think mowerman is right. Check it out.