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First Valve Adjustment


RC Randy

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Haven't owned a bike that needed a valve adjustment until now. My 01 XX with 35k had a tight exhaust valve and I just finished reinstalling the cams, rolled the motor over 3-4 times and rechecked.

 

Range is .19mm to .25 mm.

Initial check was .19mm on one of the #4 EX valves-all others were good.

 

With a micrometer the shim I removed is a 1.91mm

Have a shim kit and the one that is in the 1.90mm compartment that shows 1.90mm on the shim, reads 1.86mm with a micrometer so that is the one I installed.

 

After reassembling and rechecking I went from .19mm to 20mm. I did use a light coat of assemble lube on everything before reassembling and wondering if this could have anything to do with it.

 

Not sure if I should trust my micrometer measurements on the shims that have been swapped or my post valve check?

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It's been so long since I've seen anybody post about actually having to do a valve adjustment that I forgot that's even in the manual.  I'm sure the lube is causing the measurement discrepancy, but maybe somebody who's been there will chime in.

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.04 is a lot of change for just lube, IMO. I'd start by checking some of the other shims in the kit with your micrometer and a known good one, or at least a different one. Any discrepancies and you might be pulling the cam again.

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Yes, I did put assembly lube on he shim. I'm going to put it back together, do a throttle body sync, new plugs, air filter, and check them again in 15K.

 

I'm trusting common sense and the measurements I took during the process and I did triple check. I went with a .05 smaller shim which should take me from .19 to .24 clearance. I did check the rest of the intakes on this round after reinstalling the cams and they stayed the same.

 

Odd to only get .01 clearance increase from a .05 smaller shim, so hopefully running will seat things and it will be ok next check.

 

Last time I checked my 99XX at 77k it was still in range and needed no adjustment. It has never needed a shim since new, but now has about 100k so it will be next.

 

Edited by RC Randy
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