Most important thing Brillelli does to the SPE is to change the ignition unit, I guess we have discovered why. By the way we have tried adjusting the carb in every possible and impossible ways, reset it to factory settings included. Stripped down the carb completely and blown it with compressed air and also tried different Walbro carb from a working chainsaw. No luck:-( This engine is going back under warranty like the one before it and is beeing exchanged for an glow ASP 180 fourstroke