Thread: Crankcase Smoke
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  #13   IP: 69.161.109.238
Old 07-10-2018, 06:55 PM
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Worn Exhaust valve stems& guides also lets pressure into the crankcase.
I replaced mine with stock- snug fit-(not reamed) guides,and noticed
less blow from the oil fill cap.
I already have great compression, but the spent gases seemed to find their way into the crankcase at 3,500 rpm
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