Re: shut down problem
I dont know all the details but one thing to try is as your looking at the motor from the back there will be a little black box on the left side about 3/4 of the way up the engine. There should be a bunch of wires coming from underneath with one being a black ground, check that wire and see if its grounding good and not broken. Again dont know what exactly your motor is doing but I imagine you have already done fuel/air/spark checks.
