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01 WR 426 1/2 THROTTLE CUTOUT

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I have a 01 WR426 w/ WB full exhaust and a UNI filter, YZ cam timing, and all the free mods. I just added the JD kit and installed the jets as recommended: 170m, Blue needle 3rd clip. I can't seem to clean out the middle. At almost exaclty 1/2 throttle the motor starts to sputtter and almost seem as though it's touching a rev limiter and cutting the spark (I know it's not that). Do I need to fatten it up for the exhaust? should I keep playing w/ the needle, main, pilot circuit? Please help.

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Does it rev clean with the 170 at full throttle? If it does not, the main is too small and needs to be bumped up, thats where i would start. If the main is O.K, i would richen up the needle a notch at a time. It definately sounds lean to me.

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Because this is a 426, the main jet will usually need to be smaller, not bigger.

Try a #168 or #165 main jet for a quick comparison. They are included in your jet kit.

James

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