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07 CRF 450x Jetting?
  • WHBRAUBE
    Posts:1
    Joined:Mon Oct 26, 2009 7:03 am
    07 CRF 450x Jetting?

    by WHBRAUBE » Mon Oct 26, 2009 9:47 am

    I have a 07 crf 450x with the following;
    1. FMF Powerbomb head/Q4 Silencer
    2. airbox mods
    3. emissions block-off
    4. crankcase vent kit
    I changed the neddle to a #16233-MEN671 needle-4th
    pilot-45
    leak-jet 65...what main jet shoud I use and what should the airscrew be at? thx, Bill
  • Asmith
    Posts:14381
    Joined:Mon Apr 10, 2006 7:52 am

    by Asmith » Mon Oct 26, 2009 10:39 am

    170 Main jet, 1 3/4 to 2 turns out on the fuel screw. (adjust from there in 1/8 turn increments to eliminate decel popping and achieving the snappiest throttle response.)
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