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Thread: YFZ450 Jetting .

  1. #61
    Join Date
    Jul 2005
    Location
    Oklahoma
    Posts
    2,962
    Northern Oklahoma: Approx. 700 ft.

    2007 YFZ 450 SE
    Curtis Sparks X6 pipe
    UNI air filter w/o airbox lid
    Air temp around 74 degrees

    165 main
    45 pilot
    4th clip on NCVQ needle
    All the way in and 2.5 out on the screw

    <Mat>

    2007 YFZ 450.....with some goodies!!

    www.triple777racing.com

    "Dude, Don't laugh............I think I broke something"

  2. #62
    Join Date
    Jun 2006
    Location
    Madison, IN
    Posts
    21
    Taking the air box lid off was a must after I changed the main jet. It did'nt run right otherwise. The combination of the changes gave me noticeably more on the low end.
    06' YFZ 450
    Baffle Removed
    160 Main Jet
    Kenda Klaws
    DuraBlue 2.5" RW Spacers
    FX Graphics
    More to come!

  3. #63
    Guest
    Ported head
    web +5 cams
    WR crank
    CP 13:1 piston
    Stock airfilter. half a airbox. back is cut off.And screen removed
    C12 fuel
    Sparks bigcore exhaust

    In nj not sure elevation.

    180 main
    48 pilot
    Stock needle 5th clip down
    2 1/2 turns out

    Professionally dynoed where these were the best settings.

  4. #64
    Join Date
    Apr 2007
    Location
    SPRUCE GROVE AB
    Posts
    7
    I just bought a 07 se, elevation 2000- 3000, temp +10 deg, main 175, pilot 42, no lid, cam mod!!, drilled out exhaust, ncvq 4th clip from bottom, 2 1/4 turn on fuel screw. I still have the 06. blown motor. any body with a 04- 05 -06 do the oil mod NOW!!! or your looking at lots of $$$$ for parts. crank seized not enough oil to the crank.
    RIDE HARD, LIFES SHORT!!!

  5. #65
    Join Date
    Dec 2007
    Posts
    18
    2004 yfz
    elevation : 2800 feet
    mods : alba full pipe, velocity air filter w/o air lid
    main 170
    pilot 45
    stock needle 5th clip
    fuel screw 2.5 turns out

  6. #66
    Join Date
    Jul 2008
    Location
    Home
    Posts
    10
    DASA fullsystem
    Complete racing Head
    ProDesign with lid off (Foam)
    DynoJet kit - 142 main & 48 pilot
    Elevation 500ft
    Average Temp - 77

  7. #67
    Join Date
    Jun 2008
    Location
    Pennsylvania
    Posts
    111
    HMF sport series slipon and K&N air filter with the airbox lid on

    928FT elevation

    165 main
    48 pilot
    1 turn out on the fuel screw
    3rd needle clip
    93 valero fuel

    runs really good power throught the entire rpm range and doesnt backfire
    08 yfz
    Tusk nerf bars, HMF sport series slip on, Modquad airflow system with K&N and Outterwears pre filter, FMF Jet kit, Cam mod, Maxxis Razrs(rear)

  8. #68
    Join Date
    Apr 2008
    Location
    seattle
    Posts
    16
    Im in Seattle Wa so my guess is that its sea level-1000ft.

    Ron woods full exhaust
    ron woods intake system with k&n no airbox
    Pump gas

    jetting:
    175 main
    48 pilot
    5 postition on needle (from top)
    1 1/2 turns out on fuel screw

    Seems rich but rips, and never had to chang a spark plug yet.

  9. #69
    Join Date
    Oct 2008
    Location
    omaha,ne.
    Posts
    1
    new here but want to put my 2 cents in,06 yfz 450 bill ballance,white bros slip on,175 main,48 pilot,stock needle,adjustable mixture screw,in omaha ne.this thing runs great.neck and neck with a buddies ktm 525

  10. #70
    Join Date
    Oct 2008
    Posts
    11

    yfz 450 jetting

    i have a 06 yfz 450 with the toomey slip on, and k&n air filter no lid. the slip on came with a 175 main jet but it just wasnt right. when you stab the throttle it chokes the quad out. and my choke switch doesnt work, when you pull it out it kills the bike.

    i just bought a gytr jet kit for it but im not sure witch jets to put in and what to set the needle as... any suggestions?

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