I am going to go against convention wisdom.

I have a lot of fp 40 time. 3 of them. There are a lot of people telling you you must block the boost port or get expensive rework done to use it for control line. None of mine are. You don't need it, unless want to fly contests and are real picky. I think many people that suggest rework never owned one. And yes some have had issues with it.

People block the boost port to detune the engine and make it happier running slower. They also sometimes change the head shape or change the timing by gringing on the sleeve.

I have been successful by going to a real flat prop(11x3), fuel with a little more oil, and an extra head gasket. If you run a 5 or 6 in pitch prop, the plane will fly quite fast. And yes I still have a a few run aways on hot days. Not very often anymore. Unless I have driven 200mi to a contest I don't care.

Again, don't send your motor out to get reworked until you know you like flying stunt. It might cost you $50-$75 and be gone for a month to get this done. Is that motor worth a $50 rework? Probally not. Save your money and go out and fly, then the use rework money to get a Brodak 40, the new evo 36 or an OS LA 46, if you feel the need.


There are fliers in NJ than can help you. They use this motor without rework and are happy with it.

http://www3.towerhobbies.com/cgi-bin...&I=LXCX05&P=ML

I think this will fit.
http://www3.towerhobbies.com/cgi-bin...&I=LXCR49&P=ML

get a couple of head gaskets too.
http://www3.towerhobbies.com/cgi-bin...&I=LXCM64&P=ML