Just checked the valves on my 06 yz450 that I just recently bought and the exhaust valves are dead on at .229mm for both of them, but the intake was from left to right: .06mm, .10mm, .12mm.. I thought, no big deal, I'll leave the exhaust cam alone and just buy shims and shim up the one intake valve that's out of spec. Here's where I start freaking out, the left intake valve that is out of spec has a 1.25mm shim and needs a 1.20mm shim to correct it, the middle one has a 1.20mm shim (in spec), and the other one I cant read but it is thicker than 1.25 for sure (in spec as well). Here's my question, Should I be concerned that there is litterally no room for adjustment below 1.20, since they dont make shims smaller than that??? are my valves or valve seats shot?? The last thing I wanted to do was drop $500+ in the head on this thing.