DSP pipe and jetting - WR400 99

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  • spunalot

Posted July 07, 2007 - 06:26 PM


OK, I purchased a DSP race pipe, I also purchased the JD kit. I have a 99 WR400 in excellent shape. The pipe manufacturer says for a yz 400 to use a 180 main and a 48 pilot, there were no WR recommended jeting specs. 180 sounds to big? Did the yz400 use the same carb?

Well the only jet close that came in to JD bigger was a 170. So I tried to run a 170 with the 45 pilot and the JD blue at #4. It will not idle. To start the bike I would have to choke the bike and hold the throttle all the way open. If I let the throttle all the way off well riding it just stalls dead.

I bought 2 pilots from from a shop and they looked the same but were to big. It was running perfect before the jet and pipe change. I think I need a bigger pilot jet to get it to idle. Anyone have any thoughts ?Anyone know a place online to buy jets for that carb?

ok I found plenty of pepple selling pitot jets online but non list the WR as a model Can anyone tell me the part number for the pilot jet used in the 99 wr?
Thanks for your time.


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