I just bought a general and it starts right up but runs backwards. The guy I bought it off of says he took it for a test run, ran it a couple miles, and then all of a sudden it started running backwards. He seems to think the gears have shifted in some way but I feel like, with out opening it up, that its probably not the case. Could timing be an issue? Or is it possible the gears are the problem? He mentioned the woodruff key is messed up, stuck or flattened, which led me to the timing. My knowledge is very limited and I am not sure what a woodruff key is. Any advice before I start tearing it apart would be awesome.