Thanks for the reply. I leaned it out with about 1/8 turn. Now its pulling 6,300 rpm, with an 18-6 prop. Flew the plane today (snow melted). It was tail heavy and a hand full. Guessed wrong on CG. But seemed to have enough power for my purpose. But at full throttle it started missing. At part throttle it didn't???? Any suggestions??? Runs fine on the ground.