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Dropped in 3 slimmer shims on tightening exhaust valve clearances last weekend, and synched the carbs, cleaned the airbox and changed the oil. The bike (my wife's '02 ZX6R) now has a very faint "whut-a-whut-a-whut" noise at idle, but still runs like a top. When I double-checked the recorded clearances, learned that three of the exhaust valves on the far left side were on the tight end of the clearance spectrum (but still within spec) and all of the right valves were on the loose end (but within spec.)
Followed the service manual to a T regarding the cam-chain tensioner reinstallation, the noise immediately stops at 2000 rpm and revs up cleanly, but it idled as smoothly as an electric motor before.
Am going to loosen those left three so the clearances are all uniformly on the loose side; is this reasonable, considering all of the valves were within spec, or what else might be causing this weird little whisper?
TIA.
-Calamari Chris in Carlsbad, CA
P.S. 24,000 miles on bike, '02 ZX6R, ridden fairly gently by wife with only one track day.
 

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Well if the valves are on the loose side, then they may be a little noisy. Nothing to worry about, as long as they are in spec. Being on the loose side is better than too tight. Too tight and the valves stay open too long, which burns stuff up... When its loose you get a little noise from the cams hitting the shim buckets.
 
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