I don't know how the manufacturers go about this exactly. But my bike has all the same shims for all four valves and they only come in increments of 0.05mm anyway as per Kawasaki's service manual. Still seems reasonable to me that there is such a thing as a stock shim size in high volume engine manufacturing, eliminating the labor cost of individual screw and locknut adjustment of rocker arm designs. I'd be happy to find a video showing the assembly steps at the factory.
Anyway, shims finally shipped and I look forward to putting this mess back together soon, and hopefully without messing up the timing, kinking the timing chain or dropping any parts into the lower engine.
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