Too much emphasis on spark plug gaps...An NGK CM6 plugged into a RC EXL or C&H ignition will run an engine with the side electrode cut completley off...
.035-.045 works well...On ANY size spark plug except the 1/4-32 Rimfire...
So much for changing the gap .002 at a time and having the engine run better, unless it was too close in the first place...
Same goes for carb needles, start at 2 turns out and tune from there, factory settings are an urban myth...