Small Engine Troubleshooting Problems? Ask a Mechanic Now.
What is the full model number? Do you have a voltmeter to test with?
See if you can jump the stater solenoid, where the positive battery cable attaches, to the small switch post on the same solenoid, ad see if engine spins This is quick test of battery, cables, solenoid and starter.
There may be a relay between keyswitch and the starter solenoid, that has been damaged by the battery being backward. Bu I need to find correct model to find the diagram.
Did you find the problem?