JD jetting for WR426 with several mods

1 reply to this topic
  • Go2sno

Posted May 06, 2008 - 05:53 AM


JD instructions call for the blue needle in third clip from the top. I'm running with no airbox top, yz throttle stop, gray wire mod, '04 yz426 auto decompressor exhaust cam and vortip exhaust insert.

Will this run a bit lean or should I go with the JD setup for a yz that uses the same needle in the 4th clip from the top? I ride primarily in Michigan 500 - 1,700 ft.

Currently the stock 42 pilot seems a tad lean. Anyone have good luck bumping up to a 45?


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  • Go2sno

Posted May 06, 2008 - 04:08 PM


to the top


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