The OSF plug is a very hot Four stroke plug and could lead to problems if you have detonation. It may work in some two strokes but you may end up running a much richer fuel mix to compensate and the idle quality may suffer. It all depends on the engine. Matching the right plug to an engine is kind of an art, some engines are easier than others, but when you get it right the guys at the club will all say "I didnt know a little glow engine could run like that" .