Would anyone know where the timing mark on the cam sproket should be when the flywheel is on its timing mark? We have it set at 12 o'clock but does not seem to be set right. It also appears to be able to bolt sprocket to cam shaft at two diffrent positions. My friend bought a Haynes shop manual but does not make these items clear. If you could help us or have any information on this topic please leave a post. Thanks