hello,
i just did the nyroc exhaust mod. What jetting should i use. i used 38r 134f, but it seems to be backfiring when i let off the throttle.should i go down on the jetting, it seems rich. I didnt bore out the end cap, i left it the same just drilled out the inside.can anyone give me a heads up.
thanks

 

Letting off throttle backfire means it is lean. Adjust idle mixture. With an open exhaust, sometimes you can't stop it completely. Richen idle to reduce or get rid of it.

You should be OK on those jets, assuming they are Dynojet jets (you could be possibly rich). Make sure your needle is adjusted a little richer (I'm on the 5th notch). Mine runs like a top.

 

hello,
thanks for the info. ill try it tom. ill put it on the 5th notch.
i knew you could help.thanks again
prck