I have a 2004 big bear 400 I went to change the one way starter cluch and ended up braking the camp broke the little pin for the timing gear so I got a new cam and put it in when I pulled the head off it was real dirty so I took a wire wheel and cleaned it good and put it back together with new head gasket and I have the timing right and have the favors ajusted right has compression and Sparta new plug it will crank now with the starter but want start it tries to but just can't my oil light come on and stays on when it's cranking to idk does that mean a thing or not but befor I took it apart it run good