I was wondering if anyone would have some suggestions as i am stumped on this one. I have some rattles in the motor that sounded like the cam chain and after checking the cam chain adjuster several times i had to go further and start dismantling the motor as i thought it was maybe a worn cam chain. But after i starting stripping i found the cam chain has been rubbing on the cylinder head cover next to the chain guide on the right hand side as you can see on the picture i have attached. All the cam chain guides are in as new condition with practically no wear and the tensioner is working fine. The guide sits higher than where the marks are as the picture is deceiving so any suggestions as to why this could be rubbing. The cam chain also seems to be in top condition with no stretching evident.