My battery is new; it is getting plenty of juice. When I turn the key, it tries to start, then there is a loud knocking sound and whining sound from the battery area. It has new gas and a clean air filter. Several previous times it was as if it was dragging, but it finally started. It caught fire at the fuel cut off and I had to replace the ignition harness. I'm thinking it's the starter. What do you think? The fire and harness replacement was about 4 months ago.
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This could be your starter or even your carburetor. You should pull the starter first and take it to a lawnmower shop and have it tested. They have a machine they can test this on.
I would try the starter and solenoid.
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