OS91FX With Macs Tuned Pipe need help
 

Im not getting sufficient pressure from the muffler, i was told to put the pressure tap at the thickest part of the pipe which makes my pressure line about 7 inches, did i do this wrong? thanks for any help :)

RE: OS91FX With Macs Tuned Pipe need help
 

Sounds OK but you may want to use some thicker ID fuel line if you are having any pressure problems. It helps a bit.

RE: OS91FX With Macs Tuned Pipe need help
 

Not sure if this will help, but I have a .46 with a Macs pipe. I put the pressure nipple right where the pipe reaches the thickest part of the pipe. The pressure line is indeed quite long. Every time I start the engine, as I first run it up, it acts really really rich, like the motor is loaded up. What I do is pinch the fuel line to let the engine lean out. Once I hear the rpms pick up, I let go of the line, and its fine after that.

My guess is that I have the carb set quite rich to deal with the lesser pressure, but once it picks up, it runs great.