Large change in valve shim size required, normal?

I have an 08 CRF250R that im adjusting the valves on and i have an odd problem with just 1 intake valve. My original shim was a 1.75 and i had 0 clearance. I went all the way down to a 1.60 an still have 0 clearance, Have any of you guys seen this before? I was thinking that .15 was a major change to still not have any clearance. Any advice is appreciated.

Not good........may be time to replace the valve.

doc

Anyone else have any ideas?

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