Speedster, i agree that %15 might be better but i need it to get any 3d out of this plane. I am scraping the bottom line in power at the moment and want more power. I have spent a little over a year and 1/2 trying to get this thing running well on the bottom end, i have tried different props, fuels, and glowplugs. Bottom line is this airbleed carb just doesn't perform well for 3d. Wich i why i am seeking a new, and more powerful engine.