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Waxer

Lash me whip me, you know I need it

4 posts in this topic

99 WR400, new head & valves. This is the first valve lash adj on the new head. I have R&R the shims & 4 of the 5 valves are within tolerance now(previously all were 2-3 hundreths of a MM tight. Now 1 of the intake valves is 2/100ths of a MM loose.

Yamaha intake specs= .15-.20MM

old lash=.127MM with the 191 shim

new lash=.22MM with the 185 shim

Old shim was a 191, new shim is a 185. Yamaha only sells increments by 5, i.e. 185, 190, 195 etc. I was previously using the 191 & it was slightly tight whereas now it is slightly loose. I could go to a 190 but how much difference there would be from the 191? I could also hand lap the 191 down w/ 600 grit but I only need 2/100ths of a MM. Any ideas about running the current 2/100ths of a MM loose or should I order the 190 shim or lap the 191?

Thanks for your support :thumbsup:

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Don't be obsessive about vlave lash. I didn't even know you could get shims in less than .005mm increments

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If you can't dial the clearance in to spec then err on the loose side. You should be fine :thumbsup:

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