Re: Piston slap or valves?
Bikes mileage is about 66K, yes the rear cam chain is much tighter than the front so I think it's not how it should be and the rattle is definitely the chain being too loose. I guess the best course of action is to just strip the head right off and check the tensioner slider blade and replace the cam chain. Pushing on the tensioner blade manually with the CCT removed seems to sufficiently tension the chain.
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