So my friend and I was swapping out the exhaust cam on his WR450 for a YZ450 exhaust cam and he accidentially let the chain slide on the cam. I don't know which direction it slid and how many teeth. I have set it at TDC based on the "I" mark on the flywheel, set the dot on the intake cam level to the head, put in the exhaust cam with 13 chain pins between exhaust and intake cam, put it all back together and nothing. I have done this so many times now that I am frustrated and pissed and it takes me a lot to get to that point. The exhaust cam marks seem to be a little clockwise, not even a full tooth and if I rotated it, it would be at 12 teeth. It wont start, occassionally it will back fire if when I hit the E Start button but it will mostly just turn over with nothing. It has spark and it has fuel. Am I overlooking anything?