mkasner wrote:
There is a little retention spring on the arm that keeps the throttle from shutting off. Had the same issue happen on mine and the Onan tech just moved the spring from the back hole to the front hole. Yes I know pictures, ill have to go digging
Yes. Check this. Also, remove the wires to the low pressure oil switch and jumper (short) them to each other. It's quite common on many types of generators for the low oil switch to fail.
And, there is mechanical linkage on the carburator that can "stick" but still allow it to fire and turn over once or twice. My bet would be on the low oil pressure switch failure.