Three things:
Always set KLR valve clearances as close as possible to the max. spec. value - or even slightly above max. spec. (in 0.20mm, ex 0.25mm) since this not only reduces valve wear (esp. the exhaust valves) but also gives a wider margin against running valves at too little clearance. KLR valves always tighten up due to seat & valve dish wear.
If you grind down shims to make them fit ideally use a good surface grinder. Check that your shim surfaces are parallel. Flimsy surface grinders and especially an angle grinder with a flexi disc won't achieve this. The shim surfaces should be parallel with deviation of less than 1/100 of a mm.
Only grind one side and fit the side facing down, retaining the original surface treatment on the side which contacts the cam lobe.
Try to avoid taking more than 0.20mm in total off the shims when grinding and grind in smaller steps to prevent the shims from warping and cracking.
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