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Do valves loosen or tighten with age

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Hey everyone,

 

I have 60 newbie hours on my 2013 CRF250R. I started checking my valves every 15hours after 30 and only needed to re-shim three of them because they were a bit loose at 50hrs. The other one was a bit tight.

 

I'm wondering about that tight one. Since the other three loosened with wear, does that mean I'm now good to go another 30 or so before checking, or could that one keep tightening with wear?

 

Is there a consistent way valves go with wear is the question.

 

Thanks!

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ok, thanks! So the ones that had been a bit loose I should have left alone since now that I put a larger shim in they will need to be checked sooner?

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ok, thanks! So the ones that had been a bit loose I should have left alone since now that I put a larger shim in they will need to be checked sooner?

Yes. A thicker shim will result in less gap.

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