At TDC the ex mark was one tooth counter clockwise when the In mark was at 9. I released the chain tension and rotated the ex cam one tooth and now they align at 3 and 9 but when i add tension the TDC alignmark on the flywheel is a few degrees forward of the mark on the case. Is this a problem? next question, this is the first time with the valve cover off, how can the ex cam be one tooth off? Can they jump?