When I adjust valves, I set all valves to the dead center of spec if possible. If specs can't be centered with .05 shims, then I will go to the tight side on the intake valves, the loose side on the exhausts. But I still remain within spec in any case.
On a V-Twin, I measure all clearances 1st, write them down in a chart.
Remove the cams from one bank and measure ALL the shims. Write the shim specs down in a chart. Reinstall the cams.
Repeat this process on the other bank.
On the chart, cross out the valves that do not need to be adjusted.
It's entirely possible that a shim that needs adjusting on one valve will satisfy a shim change requirement on another valve.
Ive had many instances where upon valve clearance inspection there are 6 or more shims that need changing, and by swapping between valves I got down to needing only 2 (as an example). By writing all the shims thicknesses down you'll know what shims are in place for the next valve adjustment. You may have to swap shims between valves on one cylinder, or between cylinders
Front cylinder--apart for measuring and recording, swap shims between valves if need be, then reinstall the cams.
Rear cylinder---apart for measuring and recording, swap shims between valves if need be, but leave apart.
Obtain the shims in the sizes you need to correct the clearances you couldnt correct by swapping, reinstall the rear cyl cams. Then go back to the front cyl, remove the cams again, and use the shims left over from the rear cyl OR new shims if swapping didnt satisfy the clearances.
OR...just order all the shims new that will get all the valves within spec. I try to order as few shims as possible so I end up swapping most of the time if that gets me in spec.
Shims are available in .05mm(.02") increments. The only time Ive seen shims in .025mm(.001") were from the factory.
Ive used both factory and Hot Cam shims, have never seen them in .025mm sizes outside of what came in the engine.
One item that might make this easier: Go to Tooltopia.com, look for KAS 1610 Motorcycle Feeler Gauges. 14 sizes of small feeler gauge blades, marked in both metric and US. In a fitted pouch.
Inexpensive! These narrow blades are much easier to maneuver while measuring than conventional automotive feeler gauge packs.
Thanks for the info!
I've already measured gaps, so I'm good to go from that perspective.
Blaustrom kindly provided a link to a supplier that provides shims in .025 increments (https://www.rockymountainatvmc...m/p...o-X-Valve-Shim
), but that got me wondering if I really wanted to go down the avenue of removing each shaft to measure the shims (as you do) before placing an order.
From what I can tell, removing, re-shimming, and reinstalling each cam (one at a time) is the quickest, easiest and least risky way to tackle this job. The only way to do that is to have a variety of shims on hand (i.e. the hot cams multi kit).
I guess I'm thinking that I'd rather pay for the extra shims I won't use in exchange for saving time & complication.
Thanks again for taking the time, every bit of info helps!
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