alsancle Posted April 27, 2021 Share Posted April 27, 2021 The reason a sleeve valve engine would smoke less was the old time gas would create carbon buildup on the sleeves causing the tolerances to tighten up. You still have conventional rings on the piston which can go bad but the sleeves will last a long long time. New gas is probably too clean for the carbon buildup. 1 Link to comment Share on other sites More sharing options...
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