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Please help! Fouling fast!
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    woodsman
    Posts:2065
    Joined:Mon Oct 30, 2006 9:00 pm
    Please help! Fouling fast!

    by woodsman » Sat Apr 28, 2007 8:42 am

    I recently aquired a used 2003 yz125 that had been rejjetted for different pipes. I Have been fouling the plug in under 5 minutes please help! What would you guys use ? Here is what I have on the bike:Stock expansion chamber, FMF Turbinecore, DB Snorkel.
    All ideas are appreciated! I am hoping to ride it later today so the sooner I get this right the better!
    Currently, 05 450X
    Previously, KTM 790 Adv R, Cbr600rr, Crf450R, Crf250X
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    JAWS
    Posts:4449
    Joined:Fri Jun 16, 2006 6:59 am

    by JAWS » Sat Apr 28, 2007 8:55 am

    Here's something to get you started. I don't know if the 2003 is any different.

    YAMAHA YZ 125(2002)
    MAIN 420
    PILOT 30
    NEEDLE 6BHY24-77
    CLIP 2nd
    AIR SCREW 1.75 - 2.5 turns out

    Joe
    Last edited by JAWS on Sat Apr 28, 2007 9:00 am, edited 2 times in total.
    Image
    '05 CRF450X,McClain suspension, Cycra Probends, Pastrana FMX Pro Tapers,BRP Sub mount & Scotts stabilizer.See carb sticky for more
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    woodsman
    Posts:2065
    Joined:Mon Oct 30, 2006 9:00 pm

    by woodsman » Sat Apr 28, 2007 8:58 am

    Thanks Ill take it apart in a minute or two and see what he had in there.
    Currently, 05 450X
    Previously, KTM 790 Adv R, Cbr600rr, Crf450R, Crf250X
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    JAWS
    Posts:4449
    Joined:Fri Jun 16, 2006 6:59 am

    by JAWS » Sat Apr 28, 2007 9:22 am

    Here is what Yamaha reports as the stock setup for 2003:

    Jet needle 6CHY06-82-3

    Main Air Jet 2.5

    Main Jet #410

    Needle Jet S-1

    Pilot Jet #40

    Pilot Outlet 0.7

    Joe
    Image
    '05 CRF450X,McClain suspension, Cycra Probends, Pastrana FMX Pro Tapers,BRP Sub mount & Scotts stabilizer.See carb sticky for more
  • User avatar
    woodsman
    Posts:2065
    Joined:Mon Oct 30, 2006 9:00 pm

    by woodsman » Sat Apr 28, 2007 8:58 pm

    I just checked and he had a 440 in there! I replaced it with a 420.
    Currently, 05 450X
    Previously, KTM 790 Adv R, Cbr600rr, Crf450R, Crf250X
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