Requesting jetting recommendations

3 replies to this topic
  • Guest_Guest_*

Posted September 01, 2000 - 06:14 AM


I’m installing a FMF PC-IV2 w/Powerbomb. Does anyone have jetting recommendations.

99 WR400 with WR timing and the airbox cover removed. Altitude is 500’-1000’?

Thanks in advance,

Mike H.
St. Louis MO

  • Gary_Kessler

Posted September 01, 2000 - 06:51 AM


Hey Mike. .

There's a wealth of comments about jetting you WR if you scan down further in the notes. Also go to and there is a specific section on jetting your bike. You'll find what you need there. Remember when you jetting, air-filter type, airbox lid on/off, WR or YZ timing and exhaust type all make a difference. . . .

'00 WR; YZ modified, DSP exhaust system & UNI air, Jetting by Clark, James & Bryan. . .

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  • fershy

Posted September 01, 2000 - 07:13 AM


with wr timing and standard needle you could run about a 172 main with a powercore iv. I run a 170 at higher altitudes, and same exhaust.

  • James_Dean

Posted September 01, 2000 - 07:30 AM


See "Jetting EKP vs DVP"


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