I'm only trying to help. I'd prefer to operate without a thermostat in an airborne 2 stroke. Use shutters or a blind. Thruster I was only repeating the words the Makers used, at the time. Of course resourceful people can keep these things going but you have to get stuff early in the Piece, like low time 582's when people pulled them at 300 hours and put a new one in which didn't cost that much, if you sold your old engine on. Incidentally, I've been building and tuning competition 2 strokes since Pontius Pilot was in diapers. I don't wish to blow my own trumpet, but I'm NOT coming from a position of ignorance in this matter either. ,Nev