JD Jetting installed today

My 02 WR 426 with YZ cam timing, GYTR head pipe and a YZ muffler was lean and ran pretty rough with stock WR jetting. Got the JD kit and did the red needle (5th clip), 42 pilot, 168 main and fuel screw at 2 turns. Also put the heavy o-ring around the accelerator pump arm. She starts, idles and runs excellent and lights up hard and fast now. Your basically paying $75 for just a needle but overall, it's money we'll spent so far. Can't wait to roost some sand and hit the single tracks next week in northern Michigan...

The JD kit had the same effect on mine. Amazing difference.

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