Entomber
06-04-2002, 08:02 PM
I bought a used 400 with a a K&N Jet Kit, Air filter and Pro-circuit exhaust. It backfires and pops when I decellerate. I moved the needle two notches down, it still popped but much less. However it had a nasty bog and there was a lot of black smoke coming from the exhaust. At 1/4 throttle it would break up. SO I put it back to the way it was and it's much more responsive, but I'm sure it's running lean.
SO I'm going to buy the blasted K & N jet kit... like an idiot, I didn't check the jets that are in there. What size would anyone recommend and what should I use in conjunction witht the Pro-Curcuit coupled with the air-filter. Thanks for anyone willing to throw their two cents.
SO I'm going to buy the blasted K & N jet kit... like an idiot, I didn't check the jets that are in there. What size would anyone recommend and what should I use in conjunction witht the Pro-Curcuit coupled with the air-filter. Thanks for anyone willing to throw their two cents.