Hi, I finally built my 2 stroke engine kit today. I had it running and drove it for about 3 hours. Well I was driving it and I engaged the clutch to make a sharp turn. When i reengaged the clutch i had no power. The motor rpm also increased. I turned it off and checked the clutch and it was fine but the gears spun freely. I narrowed it down to the crankshaft gear. I saw on a forum that it was woodruff key i had broken. But I can't seem to access it. The screw won't turn. Any ideas on how to get to it? I already chewed the screw up a little. Thanks