Crf450x jetting
  • Rb30man
    Posts: 1
    Joined: Mon Oct 30, 2017 9:21 pm

    Crf450x jetting

    by Rb30man » Mon Oct 30, 2017 9:35 pm

    New to this forum, kinda confusing ](*,)

    So i have a 06 crf450x which i just rebuilt with a 13.5:1 piston and have add a 08 crf450r head and cam, was wondering what size main jet i should use, the jet in there at the moment is 165?

    Any help is appreciated, cheers.
  • User avatar
    JimDirt
    Posts: 4406
    Joined: Sat Nov 25, 2006 6:31 pm

    Re: Crf450x jetting

    by JimDirt » Mon Oct 30, 2017 10:39 pm

    Jetting is based off a few things , from elevation , to air temp , etc , this chart was made by the resident carb guru here , go by it and you should be good

    Jetting Guide for Main Jet:(pilot 45) CRF450R/X

    Sea level....165
    2000 ft.......162
    4000 ft.......160
    6000 ft.......158
    8000 ft.......155


    Temperature/Elevation:
    One main jet size (up/down) for every 2,000 feet or 25 degrees in temp.
    2020 CRF450R
    2006 CRF450X
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    Weiser , Idaho

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