CRF70F air bleed adjustment questions
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    Kiwi
    Posts: 363
    Joined: Thu Sep 25, 2008 12:22 pm

    CRF70F air bleed adjustment questions

    by Kiwi » Thu May 23, 2013 3:33 pm

    1. What is the factory setting for the stock air bleed screw for a 2007 CRF70F? [In other words, from the factory how many turns out from closed was the air bleed screw?]

    2. When riding at altitudes under 3,000 feet ... what is the suggested setting for the air bleed screw for a 2007 CRF70F?

    3. Is it correct that as you turn out (turning counter-clockwise) the air bleed screw that the air/fuel mixture becomes richer?
    2007 CRF450X with modified airbox, Uni filter w/no backfire screen, NCVS needle on 4th, 172 main, CRFs fuel screw at 2, Boyesen QS3, stock smog, 450R cam, FMF Megabomb header, Pro Circuit T-4 muffler, Pro Taper Evo bars, AS suspension
  • Aussiecrf230
    Posts: 1572
    Joined: Fri Jan 06, 2006 11:11 pm

    by Aussiecrf230 » Thu May 23, 2013 8:11 pm

    Do you mean the idle mixture screw being a four stroke(as opposed to an air screw in a 2 stroke)?
    Or are you talking about a seperate screw to adjust the strength of the emulsion near idle? Most air jets are either fixed jets or drilled passages especially in the smaller carbs.

    If you mean the idle mixture screw (with the D head) I believe standard is 1.5 turns out with standard pilot (idle) jet. You still may have to adjust a little each way to run smoothly. This should be done once it has warmed up and off the choke.
    Last edited by Aussiecrf230 on Thu May 23, 2013 8:18 pm, edited 1 time in total.
    Ray
    Australia

    CRF230F 2004
    C30F Power Up needle
    Mains 132
    Idle 45
    2 turns out
    Baffle out, Screens In

    It starts,it runs,it gets to where all CRFs can get to without the valve or valve plate dramas
  • User avatar
    Kiwi
    Posts: 363
    Joined: Thu Sep 25, 2008 12:22 pm

    by Kiwi » Thu May 23, 2013 8:18 pm

    CRF70F = 4-stroke
    2007 CRF450X with modified airbox, Uni filter w/no backfire screen, NCVS needle on 4th, 172 main, CRFs fuel screw at 2, Boyesen QS3, stock smog, 450R cam, FMF Megabomb header, Pro Circuit T-4 muffler, Pro Taper Evo bars, AS suspension

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