Over the weekend I did my top end and re-shimmed my valves for the first time. I was able to use 3 of the 4 stock shims to get my valve clearances within spec. I went to my local dealer to buy a 2.93 mm shim and they stated that they always use an electronic micrometer to measure the thickness of the shim instead of going off of the numbers on the shim. When I did my calculations in my garage, I just used the numbers on the shim to figure out what size I needed. My thoughts were that their micrometer could be off and not calibrated properly and that I would have to use the same micrometer on the shim that I removed to truly be accurate? Keep in mind that this is a dealer that also gave me the wrong size diameter shim when I told them it was for an 07 kx250f. Long story short, I bought a 2.90 mm shim that my dealer measured it to be 2.87 mm because that was the largest they had in stock. I put everything back together and all valve clearances are within spec so I am not that worried about it. But I am curious to see who else measures them and doesn't go off of the numbers on the shim.