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Thread: YFZ450 Jetting .

  1. #41
    Join Date
    Feb 2006
    Location
    ship, pa
    Posts
    40
    full system yoshimura TRC...

    158 main
    50 piolet
    new needle i think 3rd clip

    air box lid is on and im also in PA it runs great...

  2. #42
    Join Date
    May 2004
    Location
    west london uk
    Posts
    61
    i drilled the air screw out today and have a new comeing on friday
    so hope to heve the problem solved

  3. #43
    Join Date
    May 2006
    Location
    seattle area
    Posts
    29
    06' yfz450

    Bill Ballence GYT-R titanuim head and pipe
    High flow No Box lid
    165 main jet
    45 pilot
    GYT-R needle Clip 3
    2 full turns
    seattle 200'
    it seems to be dialed in no bog or lag through out the range
    made a huge difference on the 3rd groove and taking it back from 2 1/2 to only two turns
    its so fast now my girl wont get on it anymore .........PERFECT

  4. #44
    Join Date
    May 2006
    Location
    seattle area
    Posts
    29
    GYT-R Titainum full
    Pro intake LID OFF
    (Bill Balence Kit)
    165
    45
    GYT-R 3rd clip
    2 1/2 turns

    Seattle WA,
    I'm around 400 feet
    70 degrees

  5. #45
    Join Date
    Dec 2006
    Location
    San diego
    Posts
    9

    My new YFZ450

    I need help i just got the velocity intake and purchased the FMF titanium4 full exhaust and iam not sure what jets to use or even how to figure it out. i was reading your colum and noticed a lot of stuff i dont understand like the fuel screw turns or the size of the jets or temps and elevation. Well i live in san diego so temps are usaully between 50-80 at sea level but i love to go to the desert but i am unsure of the elevation. any help will be great thanks.

  6. #46
    Join Date
    Jun 2006
    Location
    Madison, IN
    Posts
    21
    165 Main Jet
    Pilot, Fuel Screw, and Needle Position Stock
    Stock Pipe w/ Baffle Removed
    Stock Filter w/ Air Box Lid On
    93 Octane Pump Gas
    06' YFZ 450
    Baffle Removed
    160 Main Jet
    Kenda Klaws
    DuraBlue 2.5" RW Spacers
    FX Graphics
    More to come!

  7. #47
    Join Date
    Mar 2001
    Location
    Capron, IL USA
    Posts
    53

    Big Gun

    I just bought a Big Gun Race Series complete exhaust and will need to rejet. Any recommendations of where to start would help. Only other mods are: no airbox lid and a K&N filter.

    Rockford, IL Elevation is around 800 feet.
    Temp: 65 degrees

    Thanks.
    1999 400EX
    2004 YFZ450

  8. #48
    Join Date
    Apr 2007
    Posts
    1
    Hello,

    I´m new here and have registered for one question.
    (I have no quad, but a keihin carburretor from YFZ450,year 2004)

    I installed it in my husaberg enduro.

    I´m surching for a good jetting, and have spend a lot of time in the web.
    (It´s quite plain to me, that your jettings must not be the best for my engine (501ccm, longstroke), I will not just copy this )

    The stock needle was a NDS-R

    The most people here changed to NCV-Q

    looking in the keihin.us needle chart
    http://www.keihin-us.com/am/_media/p...jetneedles.pdf

    the needles are termed OC-XXX

    (OB is possible too, I know the difference to OC)

    Is a NCVQ in full term OB-NCV???
    This is improtand for me to get information about the diameter and so on.
    And when this is right, was does the smaller fourth letter "R" mean?
    for example Kawasaki has a NCVR needle in the FCR40 (KX450F Motocross...)

    thanks in advance!

  9. #49
    Join Date
    Apr 2007
    Location
    SPRUCE GROVE AB
    Posts
    7
    06 YFZ 450: 172 MAIN, 42 PILOT,NCVQ 4TH, K&N NO LID, FATBOY 4 FULL SYSTEM, EXHAUST CAM MOD, 2.5 TURNS ON FUEL SCREW, ELEVATION 2000'-2300', 17-30 CELCIUS=APPROX 65F? IAM HAVING PROBLEMS WITH TOP END WOT, I AM GOING TO TRY 45 PILOT & 175 MAIN TODAY IF IT STOPS SNOWING YAH THATS RIGHT SNOWING ON APRIL 19. SHEEET I SHOULD BE RIPPING UP THE SAND WITH MY BOYS!!!!!!!. IF ANYONE HAS CLOSE TO THIS SET UP ON THE 06 WITH NO TROUBLE @ 3/4 TO WOT PLEASE POST IT.
    RIDE HARD, LIFES SHORT!!!

  10. #50
    Join Date
    Aug 2006
    Location
    mass.
    Posts
    578
    what do you guys think the jetting should be with baffle out and lid removed?
    White 06 YFZ Full HMF

    2000 Yamaha Blaster
    LRD, UNI, Carbon tech, RAZR, DG, Durablue, twin row carrier,30mm oko, reed spacer, injecter block off....

    Stock 1987 250x

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