Reply To: 1931 Model 42 Mosquito Sprayer

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August 25, 2010 at 1:38 am #394264
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Show us a photo of #4 piston at the top of the cylinder. Is the piston clean around the outer perimeter? if so, the rings are bad or stuck in the grooves, the oil is washing the top of the piston clean. Since you have the head off, I’d drop the pan and push at least that one piston up and out, and inspect the rings..

Greg L