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Loose valves.

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2002 yz250f.  I checked the valves the other day after some starting and running issues. The issues were hot starting and hanging idle .

EX,    27   22   spec is 17-22

IN.    20  12  17  spec is 10-15

Curious what caused the valves to loosen . Dont they usually tighten up ?

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Carbon build up on face, or bent are the causes for the gaps to open up. Or they could have set wrong the previous time

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And I've seen the shim get cocked over sideways on install, then when it drops into the pocket, the clearance opens up.  So I feel the to top of the shim/bucket for even placement in the pocket now.

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