Unfortunately, when I put everything back together, we had the same problem, I can start it by hand, but it won't start on it's own. So I took it apart again, inspected the switch, and everything looks good, clean contacts, etc. no burn marks. It was stiff to turn (I don't recall if it was more or less stiff than before), is there something that needs more lubing or something? As I say, it works just fine once I hand crank the motor.