The cam chain tensioner seems to be a major source of concern, apparently this thing can ultimately extend itself so far as to come apart and drop into the gears. Lovely. I'm thinking of fabricating an old-fashioned screw type manually adjustable tensioner. Yes, it would be a pain because I'd have to pull the clutch cover ever 5K miles or so to check the adjustment, but that's better than losing my engine. Besides, Harley uses a chain between the engine and tranny and after about 10k miles it seems to have done 90% of the stretching it's going  to do.

Any feedback on this? Has anyone already done it?