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Check for a low oil sensor on the engine. If it has one, check and top off the oil level first. Next, disconnect it and see if the engine will fire up.

Did you set the airgap between the coil and the flywheel magnet? A simple business card will work. Also make sure you have the correct plug for the engine. Not just any plug will do.

Sounds like a worn drive unit if this is a zero-turn model. What are you working on?

My reply was late because the entire page did not load. This fuse will easily blow especially if you try jumpstarting from a car battery. The Amperage is way too high jump starting. Always pull the battery and charge it or replace it.

Check the headlight harness. It has a ground that doubles back and goes up to the starter solenoid. This ground tends to break, and it will not crank and run if that happens.

Number one problem is the valve lash adjustment. Go to a You Tube site called Teryl fixes all. He is a bit of a clown but has all the info you need about how to adjust the valves. The next problem could be more serious and the compression relief mechanism is broken or stuck on the camshaft...