can anybody tell me where i can find the main rotor gear an pinon gears at thanks i have a sport 500 mfa 1 model

Try here.

http://www.hobby-lobby.com/sport500.htm

Have you thought about getting a new design? One that would fly better?? Any of the new ones out there would be better.

Hawk, Ratptor, Caliber, Venture. The parts for all of these are easy to get from almost any where.

Dru.

yes i am thinking on a rapter 30v2 do myou know if a 46 pro airplane motor will work if i change the muffler thanks

You would most likely need to change to a heat sink head as well as the muffler.

Dru.