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John Deere 110 pre compression knock

Jon ~1974 John Deere 110 with K241 Kohler engine (10HP), recently did a rebuild: crank, piston rings. Ridge reamed top of bore and deglazed bore, new components all standard bore size, also new capacitor, coil and points. Seem to have a pre-compression knock now? Happens with no load or light load, when adding throttle, or driving and govenor is modulating engine. Checked "S" (spark) mark on flywheel, points open when "S" at top of sight hole in engine shroud. Regular gas, ~few weeks old at best. Comments, suggestions?
Thank you

Gene Gauss An obvious check would be to try the highest test gasoline you can find to see if it makes a noticeable difference. (Around here I see 93 octane in service stations, and there is some higher octane stuff (~100?)in selected stations around for racing car use. I've heard of some people using aviation gasoline in chainsaws if you want to go to the limit.)

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