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If it is a cam chian tensioner, it is the first I have heard of on anything other than a Honda. They had cam chain tensioner problems, and still do. Go figure. For what its worth, when I tore down my blown up engine to see what happened, the entire top end was fine, including the cams, cam chain, and tensioner. The cam chain tensioner is the last place I would look. Could a cam have been put back in funny when the bike was apart for valve adjustments? That would really foul things up, most likely up and down the rev range. A simpler place to look is the throttle body synch- that can cause rough running, even though I would expect more of a stumbling problem than a vibration problem.
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