ORIGINAL: Villa

Hi suzonka
You did not mention how far away the fuel tank is. On my Canard the center of the fuel tank was about 15 inches away from the carburator. I was getting irratic RPM during various manuevers. I added a 2 once fuel tank right next to the engine and solved all fuel problems. Muffler pressure connects to the main tank; main tank outlet connects to small tank pressure connection; small tank outlet connects to carburator. Your .25 engine, if in good condition and tuned right should handle a plane that size. I have a pusher puller with two .28 magnum engines. In the winter I can take off with just one engine, front or back. I use 9 x 6 props made by APC. The pusher prop is marked 9 X 6P. The P is for pusher. Make certain your pusher prop is not mounted backward. The efficiency drops tremendously. Let me know how it goes.