ORIGINAL: obiwan12
Hi all, I thought I'd chime in, in favor of the #8. I've used them in all my 2 stroke glow engines from a .25 to a 1.60 for the last 17 years. I've never had a single problem with that brand of plug. Most plugs will last 2 to 3 seasons, some a little more, some a little less. Usually from what the original poster stated, it sounds like you are running the engine too lean for maximum power. Back the engine off by 100 rpm to the rich side and you'll probably extend the life of your plugs.
On a side note, I've used fox and enya plugs along with the number 8 for the first five years of modeling with mixed results. I've usually noted during that time, that the non-OS plugs had a shorter lifespan.
TIFWIW.
My engines produce great power. I fly at sites that range from 600 ft ASL to 1200 ASL. Temps range from 20 degrees 20 % humidity to 95 degrees 90% humidity. As always, more power is "observed" in the cooler dense air of the winter/early spring than in the heat of summer.
What plug doesn't last two or three years? Maybe I didn't fly the same model often enough but that seems the norm to me. IMO Enya probably last the longest. Fox RC plugs about average except the Gold and Miricle plug which last a long time. The OS F1 plug lasts a long time but OS #8 about average tobetter than average. But maybe I was running it more often, hard to say.