This started with a leaking sump or crank case oil leak. I have a yazoo-kees 42" commercial ZT. Mower was running fine when taken in for repair. 1 week later mechanic calls back a says he installed new gasket ran for fifteen minutes to ensure the leak was fixed. I went to pick it up and mower would not start. Sounded like timing issued. Here's the kicker. The motor has been broken down two more times and reassembled and still will not run. Mechanic advised all timing marks were alligned properly and reassembled to specs. There is spark and fuel. Mechanic called Kawasaki and they advised it could be a bad crank and sent new crank free of charge. This did not fix the problem. How Does a crank go bad from a gasket repair. kawasaki's answer was it's a freak thing sometimes. I could go on. Need help.