Originally Posted by MELK-MAN
yes, that makes some sense. what are the valve clearance specs? if they are just on the tight side of the spec i wouldn't change any shims.
Intake .13 - .20 Preferred from the Yamaha manual .15
Exhaust .23 - .30 Prefered from Yamaha manual .25
all 8 of my exhaust sides are either .203 with one being .229 tight so i'll be doing all of them.
got a few intakes that are perfect at .15 but a couple that are tight at .127 so im going to try to do them also if i can get a shim to make them be about .15. got all of the buckets and shims out and in bags labeled, gonna measure them today to determine what size i need to go with.