I had my bike on the stand for new chain and sprockets, and thought I'd check the valves while I was at it. 2011 with 15k miles. Here are my measurements:
Cylinder 1: Exhaust .241 Exhaust .254
Cylinder 1: Intake .178 Intake .165
Cylinder 2: Exhaust .279 Exhaust .279
Cylinder 2: Intake .165 Intake .165
All within specs, but should I go ahead and change everything to get closer to .31 exhaust and .21 intake? Or leave it as is for another 10-15k miles?
I would adjust to the outside spec as long as you are in there and have the opportunity. That way will also give a bit of leeway on extending the next check if it's not convenient.
But then there is the "why not put off until tomorrow what you don't have to do today" way of looking at things.
Yeah, if you want true ram air tuning, you better be willing to ram some air! (SteveinSunnyFlorida)
'99 Concours(with 234,xxx miles on it), sold
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And most of Canada too, eh?