Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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This sounds like you have a solenoid that is contacting internally when it should not be. It is throwing voltage to the starter at times which is causing the starter to engage when the engine is already running. If you can get access to the starter post it would be easy to test this. With a volt meter you can start the machine then test for VDC at the starter post while the machine is running. If you are getting voltage to that post it has to be coming from the solenoid. The only other place that you could check for issues would be at the solenoid to see if maybe the switch is causing the solenoid to power up when it should not be.