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Point blank your engine still has 3-ring pistons that are not the later pressure back design. I would run a 24: 1 mixture for this reason alone. That engine is not bad on fuel and the extra oil protects against damage during an overheat much better than a leaner mixture will. Piston material is an older, softer compound as well vs. later pistons designed to stand up to lean oil mixes. Your spark is easily hot enough to eliminate plug fouling as long as you run a good lean idle mixture. Correct mixture will minimize smoke as well. Very often the marketing dept. was all too eager to introduce a change to the market whether or not the engineering dept. was ready to say....okay.