I agree with the other posts but I have another suggestion I had the same problem with my flybaby with adding weight I had originaly put about 1&1/2 lbs of lead in a compartment just behind the firewall and on the engine mount this much weight did not make me to happy so I had to figure a better way so what i did was put the weightas far forward as possible so i glassed the lead inside the nose of the cowl and put a heavy hub on the engine and reinforced the cowl mount with glass and added 2 more mounting screws and with moving the weight forward i used about 10ozs of weight so that saved alot.