We are both thinking the same thing, but one important thing you want to remember is when shimming and changing cams you want to be at TDC on compression stroke, the other TDC is decomp stroke.Originally posted by d3ktrix
4 strokes hit TDC twice for every ignition
2 strokes hit TDC once for every ignition
Like ghott said, the crank rotates twice for every one rotation of the cam in a 4 stroke.
Thats how I understand it anyway =)