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Valve Clearance Question

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Just got done putting in a new piston and valves in my 09 YZ250F and to my suprise the valves were tight. The old ones were in-spec when I tore it down. I am confused on how new valves could be tighter than the old ones. Any ideas:bonk:

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no I didn't. The seats still looked really good. The Bike only has 30 hours on it.

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