Join Date: Feb 2017
Location: St. Louis, Missouri
I wouldnt skip any specified mileage interval concerning a valve clearance check. You can't know when a clearance will change, if it changes, or how fast the change occurred.
If you already buttoned it up and it was within spec, dont sweat it until the next time a check is called for. Then you'll know.
Concerning the adjust method itself, I try to simplify things:
1) Make or download a chart showing valve locations. For example, Cyl Head 1--Intake A/B, Exhaust A/B. Cyl Head 2--Intake A/B, Exhaust A/B (4-valve heads, valves left-to-right from rider's seated position)
2) Measure the valves. If within spec, cross them off the chart. If theyre off, note the clearance, compare to spec, and do the math to figure out if you need a thicker or thinner shim to arrive within spec. For example, +.10mm or -.15mm from what the current shim.
3) Take out the shim, measure it, add or subtract the difference needed to get your shim size, and reassemble.
The shims that dont need to be changed I measure anyway, and keep a chart of all the shims that are in my engine when done. The next time I need to adjust I'll already know what's there, and it's just a matter of doing the math.
It's not rocket science.
Last edited by MAZ4ME; 07-13-2018 at 02:57 PM.