Hi AdamKing,<br /> Your motor needs a richer than 50:1 mix. I would run 24:1, possibly 32:1, but no leaner than that. It has bronze babbit bearings which NEED the extra oil to survive.<br /> Don't use the RJ6C plug, as it has a resistor gap - not necessary in your motor. Use the standard J6C Champion plug (or NGK equivalen)...<br />- Scott