The engine cranks but will not turn over. I just changed out the spark plugs with new ones. Ince I pout the lanyard on I get one beep and then try starting but it wont turn over. The only thing I can think of is a clogged fuel filter or bad fuel. ( the fueel has been in since last summer and I never winterized the tank)... Could it be a bad fuse somewhere? I have tried all I know.