Ok.. Since I had off today from work I wanted to check the motor on the plane.. Couldn't fly it today since its a little too windy. For what i gather I think its not the motor becuase im getting some pretty nice tach numbers. This is what i got. On the MAS 7x4 prop with wildcat 15% fuel I was getting a peak tach of 19.3k and a mininum of 18.9k. So what could it be then. CG?