Jetting 01 yz 426

2 replies to this topic
  • Ilikecamarosanddirtbikes

Posted April 07, 2004 - 02:51 PM


I recently bought a 01 yz 426 and I have a DSP full exhaust system on it. It backfires after letting off the throttle. I know I need play with fuel mixture needle, but I was wondering what people ran jetting wise at about 550-700 ft. elevation with an aftermarket pipe.

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  • Matt96xr6

Posted April 07, 2004 - 04:34 PM


BK mod
JD jetting kit
ZipTyRacing fuel screw

  • Fastest1

Posted April 08, 2004 - 04:56 PM


Definitely adjust the fuel screw, you need more fuel in the idle circuit. It will eliminate the popping. A very small amount of popping is desired when decelerating for the best throttle response. I am at sea level, look at my signature and check the jetting out! :)

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