I've got a Stanley riding mower with a 17 horse motor and I can't get it to run. I got this from a neighbor, he had some problems and burnt the starter solenoid trying to get it started. I have put power direct to the starter and it will barely turn the motor over. If I remove the spark plug it spins over no problem, but if you hold your finger over the spark plug hole, the rpms drop sharply and it eventually stops turning. I assumed that the starter was shot so I removed it and disassembled it and I don't see anything wrong with it. Brushes look fine, bearing spins freely. Reassembled and it does the same thing. I realize that it could still be the starter, but I'd have to buy another one in order to find out and I'm sure they're not cheap. If anybody out there has any other ideas of what might cause this condition please let me know. Thanks.