Looking for some advice on an issue I am having with the cam chain tensioner/flywheel timing. After adjusting my valves and reinstalling the cam I set the flywheel marks inbetween the mark on the case while aligning the lines on cam gear horizontally with the head. The issue arises when I install cam chain tensioner (with it fully retracted) and torqued , slowly releasing the tensioner (putting tension on the chain) rotates the cam gear clockwise and the fly wheel marks do not line up. I have tried many different teeth and combinations, never able to get all marks to line up after tensioning chain. Timing is perfect after cam is torqued with no tension on chain. Could a worn, stretched cam chain be what is causing this? I appreciate any help, have taken the cam in and out 15 times and different settings and cannot get flywheel marks to line up upon tensioning of the chain. Thanks for any help!