I have a time cutter 4200 with the Kohler 19hp engine It was working fine, I shut it off and when I restarted it it was making a terrible noise. It sounds like the starter is not disengaging after it starts. Could that be possible. If so what would cause this a bad starter or bad solenoid. I know I put a starter in it and quite possibly a solenoid a few years ago. I am not sure how to troubleshoot this. Unit is about 15 years old