I recently acquired a NIB .91FX and was reading bout the muffler chamber adapter. It says it won't work the .61 series as it doesn't produce enough back pressure for them. It does go from 9.95cc's/.61 to 14.95/.91. To say the least, the .91 seems to like to breathe a little more.

I want to install a tuned pipe for performance, but I've read about how tuned pipes are more for high revving (air) motors. From my years of off-road experience the tuned pipe was very versatile as far as adjustment range on any number of pipes. Do they make a good tuned, "tunable", pipe that may work on this motor??


Shane

Tuned pipes used in aircraft are usually not broad-tuned like you're used to with R/C cars. The pipes on airplanes are usually tuned for a narrow RPM range at full throttle, and are intended to get the last little bit of power out of the engine.

That's kind of what i was suspecting, since every one I saw was one piece.

Thank you Bax..

SHane