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What does everyone mean when they say.....

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What do you all mean when you say the "valve is getting tight". I know you mean the clearance is getting tight when checked, but does this mean the valve is sinking into the head?? And how many times( I know each bike is diff, but whats a good rule of thumb) can you put shimms in to take care of this before the head grenades. Thanks in advance..................

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when the valve sinks into the seat the clearence at the top of the valve stem above where it passes throught the valve spring and keeper becomes less so your valve clearence tightens up.

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