I had a 214 in the early 80's that the governor opened up while mowing. Moved throttle all the way down and the motor still revved. Had to just turn the key off. It was still under warranty so the dealer picked it up and fixed it. I don't know what he did to it, but I don't think he tore the motor down on a brand new machine. I would hate to see you go through all that when there could be a simple fix.