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Like i said, i have seen the front chain cushion put in the wrong side of the chain making it impossible to fit the sprocket to cam, the cushion goes inside the chain facing forwards which is not the intuitive way of fitting.If you look at an online parts book i seem to remember it saying how long the chain is but my books are stashed away at the moment
You aint the first and wont be the last, by the way the slot in the end of the tensioner screw is for assembly purposes only DO NOT use a screwdriver to force the tensioner blade tighter, seen too many wrecked tensioners that way.ALSO read, reread and read again the warnings in the manual on fitting cam cover, valves and guides are expensive now
Not sure if you've seen or heard of this Gary but everyone now (except me of course) uses elastic bands to hold the rocker arms up, just band the 2 together inlet to exhaust, so they pull each other up, you'll need 4 bands of sufficient strength. I've never done that myself as I tend to just lift them up by hand but TBH it's probably a better method than mine, almost fool proof. Wind the adjuster screws almost out as well. Better safe than sorry.
Late 550 rocker box instead of a 500 one, good mod to do as they are better than the 500s.
Those 4 bolts in the middle are to hold the rocker shafts to stop them rotating. The 500 doesn't have them and it has been known for the rocker shafts to oval out the camcover. It was an upgrade by Honda to rectify that problem.
That could be a 550 F2. Are you selling it, if so first dabs please.