I think the honor of being the first alternate firing Johnson would have to go to the 1930 A-50 and K models. They’d been around a few years before your motor was built and yes, your 71 lb. 9.8 horsepower KD-15 motor was the forerunner to the QD series and calls for an 8:1 fuel mix using 40W oil. AeroShell Oil 80 or AeroShell W80 aviation oils are both SAE 40 W oils. Two rings on the large rotary valve seal the crankcase. The original square condensers were rated at .22 uF and the Champion 5MJ plugs are set a .030" and the points at .020". The magneto is kind of unique with a separate coil for each cylinder. You say you pried the flywheel off? It would be better to use a puller to avoid risking any damage to the flywheel.
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