I just don't get why this FPE 2.4 doesn't pull this 140 size Edge verticle. It is a 40cc engine that is pretty light compaired to other engines on the market and has the same HP ratings. There isn't too much to tuning on gas engines. Set the low end and then match the high end with the low. As long as it doesn't quit while the plane is pointed straight up you should be fine.

It runs great BUT . doesn't have the power it should I guess.