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Old Oct 27, 2012, 12:29 PM
gkamysz is offline
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I would say what you're observing is normal for the installation.

Valve clearances in model engine open up as temperature increases. The crankcase is aluminum while the rest of the valve train is steel. The valve itself runs hotter, but how much does it really expand when it's only 26.4mm long?

Greg
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