I have a 05 venox and love the bike, till now. It started tapping so I have adjusted the valve clearence three times. Checked many more times and still it tapps. I was looking at the cam chain tensioners, it says in the book to turn clockwise to tighten up chain and there is nothing to turn. when I removed the cover screw and O ring the is nothing there to adjust. Help, also the tapping will go away from time to time at a idle.