Jetting Database
  • User avatar
    crfsonly
    Owner
    Posts: 9651
    Joined: Thu Apr 01, 2004 3:45 pm

    Jetting Database

    by crfsonly » Mon Apr 09, 2007 5:18 am

    Please keep other info out of this thread. Only answer the questions. Copy and paste to keep format uniform.


    Year:
    Elevation:
    Temperature Range:
    Backfire Screen:
    Air Filter:
    Pilot Jet:
    Main Jet:
    Needle:
    Needle Clip Position:
    Fuel Screw Type:
    Fuel Screw Setting:
    AP Modified:
    Leak Jet:
    AP Cover:
    Exhaust Type:
    Exhaust Modified:
    Last edited by crfsonly on Fri Jul 15, 2011 7:34 pm, edited 1 time in total.
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  • Hale701
    Posts: 25
    Joined: Mon Nov 06, 2006 8:17 am

    by Hale701 » Fri Jun 15, 2007 9:26 am

    Year:04
    Elevation:450-550
    Temperature Range:70's-90's
    Backfire Screen:no
    Air Filter:Twin Air High flow
    Pilot Jet:stock
    Main Jet:160
    Needle:stock
    Needle Clip Position:stock
    Fuel Screw Type:Zip tie
    Fuel Screw Setting:2
    AP Modified:yes
    Leak Jet:40
    AP Cover:Boys. Q. Shot
    Exhaust Type:FMF Power Bomb-
    Exhaust Modified:06 head port & polished stk
    valves and springs. Cam designed by Jason Jones of JJones Racing. Cam degreed. 13.5 JE High Comp. Piston.
    Both scary fast intake fins
    Runs like a bat out of hell!
    Last edited by Hale701 on Tue Nov 20, 2007 6:37 am, edited 3 times in total.
  • User avatar
    KevinM
    Posts: 474
    Joined: Tue Mar 14, 2006 12:21 pm

    by KevinM » Fri Jun 15, 2007 1:38 pm

    Year: 2007
    Elevation: 100-400 MSL
    Temperature Range: 30 - 90 Deg F
    Backfire Screen: Stock
    Air Filter: TwinAir
    Pilot Jet: 45
    Main Jet: 180
    Needle: JD Red
    Needle Clip Position: 5th from top
    Fuel Screw Type: CRFsOnly
    Fuel Screw Setting: 2 turns out
    AP Modified: No
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: Stock
    Exhaust Modified: No
    09 CRF 450R
    07 CRF 250R
    45 plt /175 main /JD Red-5th pos
    FS 2 trns
    05 CRF 250X
    42 Plt /162 Main /JD Red Needle- 5th pos
    CRFsOnly Fuel Screw 1-7/8 trns out (2 turns winter)
    TwinAir PowerFlo Kit /Opened Airbox /White Bros E2
  • User avatar
    fbr
    Posts: 108
    Joined: Thu Apr 05, 2007 6:52 pm

    by fbr » Tue Oct 09, 2007 10:47 am

    Year: 2007
    Elevation: SL-2,500'
    Temperature Range: 50-100F
    Backfire Screen: Removed
    Air Filter: Twin Air "Backfire"
    Pilot Jet: 42 (stock)
    Main Jet: 172
    Needle: NKUS
    Needle Clip Position: 3rd
    Fuel Screw Type: MSR
    Fuel Screw Setting: 2 1/4
    AP Modified: N/A
    Leak Jet: 65
    AP Cover: N/A
    Exhaust Type: FMF Factory 4.1 Megabomb (single)
    Exhaust Modified: No
  • tylero21
    Posts: 52
    Joined: Tue Sep 16, 2008 10:27 am

    by tylero21 » Sat Sep 20, 2008 3:44 pm

    Year: 2007
    Elevation: 2500'
    Temperature Range: 80
    Backfire Screen: none
    Air Filter: K&N
    Pilot Jet: 45
    Main Jet: 168-170
    Needle: STOCK
    Needle Clip Position: STOCK
    Fuel Screw Type: STOCK
    Fuel Screw Setting: 1 3/4 out
    AP Modified: no
    Leak Jet: 45
    AP Cover: Boysen QST
    Exhaust Type: Yoshimura Twin
    Exhaust Modified: no
    www.tylerohara.com
    CRFSONLY.com Supermoto Racer
  • kiwimade
    Posts: 11
    Joined: Thu Dec 11, 2008 4:14 pm

    by kiwimade » Wed Dec 17, 2008 4:58 pm

    Year: 09
    Elevation: 900 msl
    Temperature Range: 20-30 C
    Backfire Screen: std
    Air Filter: std
    Pilot Jet: 42
    Main Jet: 185 jd
    Needle: red jd
    Needle Clip Position: 5th
    Fuel Screw Type: std
    Fuel Screw Setting: 1.25 - 1.75
    AP Modified: std
    Leak Jet: 55
    AP Cover: std
    Exhaust Type:std
    Exhaust Modified std
  • Collin
    Posts: 176
    Joined: Sun Nov 18, 2007 1:18 pm

    by Collin » Tue Dec 23, 2008 7:54 pm

    Year: 2006
    Elevation: 500-800
    Temperature Range: 30-100
    Backfire Screen: stock
    Air Filter: twin air
    Pilot Jet: 45
    Main Jet: 172
    Needle: stock
    Needle Clip Position: stock
    Fuel Screw Type: stock
    Fuel Screw Setting: 2
    AP Modified: no
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: stock
    Exhaust Modified: no
    "Speedy"
    08 CRF150RB (sold)
    07 CRF150R (sold)
    TRX250ex
    Dads CRF250X (sold)
    Racing Hare scrambles on KTM's
  • Dirtbikeboy
    Posts: 4
    Joined: Tue Jan 03, 2006 11:10 am

    by Dirtbikeboy » Wed Apr 01, 2009 12:25 pm

    Year:08 crf250r bog bog bog
    Elevation:sea level
    Temperature Range:85
    Backfire Screen:no it is out
    Air Filter:stock
    Pilot Jet:stock 17/8 out
    Main Jet:185
    Needle:stock
    Needle Clip Position:3
    Fuel Screw Type:stock
    Fuel Screw Setting:1-7/8 out it has no efect on it all the way in or out.
    AP Modified:stock
    Leak Jet:stock
    AP Cover:stock
    Exhaust Type:stock
    Exhaust Modified stock
    Thank you :x
  • JLWARD09
    Posts: 2
    Joined: Fri Apr 24, 2009 2:58 pm

    by JLWARD09 » Fri Apr 24, 2009 3:02 pm

    I am living about 6000 ft above sea level and I need some good jetting specs for my CRF 250R that has a oversized piston mod and has a heavy clutch plate and I am lost for jetting specs here!!!!! Please let me know if anyone knows what I am lacking... the bike is not running good and it bogs at first and I have to ride it like a two stroke.
  • Hammer
    Posts: 66
    Joined: Tue Jun 27, 2006 10:07 am

    by Hammer » Fri Jul 03, 2009 3:17 pm

    Year: 04
    Elevation: 0-100ft
    Temperature Range: 70-90
    Backfire Screen: no
    Air Filter: twin air kit
    Pilot Jet: stock
    Main Jet: stock w/power now wings at both ends
    Needle: stock
    Needle Clip Position: stock w/ready racing throttle lingage and boyesen quick
    Fuel Screw Type: msr
    Fuel Screw Setting: #2
    AP Modified: stock
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: fmf with mega bomb w/icat and a hot cam stage 1.
    Exhaust Modified:yes

    I have a bog of the bottom that I didn't have before the throttle lingage. before it was very good. can it be made great?
    If you can't ride good, then look good riding

    In the morning, we ride.

    2020 crf250r
    04 crf 250, power now, Icat, full fmf ti exhaust, hot cam. Tom Morgan ported head,New ti valves, springs.
  • 897team
    Posts: 3
    Joined: Fri Oct 23, 2009 10:34 am

    by 897team » Tue Nov 10, 2009 1:21 pm

    Year: 2008
    Elevation: 4,000+ft
    Temperature Range: 35-105
    Backfire Screen: yes
    Air Filter: stock
    Pilot Jet: 45
    Main Jet: 172
    Needle: stock NMGU
    Needle Clip Position: 2nd clip
    Fuel Screw Type: stock
    Fuel Screw Setting: 2-1/2 cold, 1-1/2 hot
    AP Modified: stock
    Leak Jet: 40
    AP Cover: stock
    Exhaust Type: FMF Megabomb into single FMF 4.1 Titanium Mufler
    Exhaust Modified:yes
    Last edited by 897team on Tue Dec 08, 2009 2:04 pm, edited 1 time in total.
  • ken750f
    Posts: 7
    Joined: Sun Nov 15, 2009 8:15 pm

    by ken750f » Mon Nov 16, 2009 7:55 am

    Year: 2007
    Elevation: 2,500 - 4000'
    Temperature Range: 50-100F
    Backfire Screen: Removed
    Air Filter: No Toil
    Pilot Jet: 42 (stock)
    Main Jet: 175
    Needle: JD Red
    Needle Clip Position: 4th
    Fuel Screw Type: Stock
    Fuel Screw Setting: Stock for now
    AP Modified: N/A
    Leak Jet: Plugged - Installed Quickshot 3
    AP Cover: Boyesen Quickshot 3
    Exhaust Type: FMF Factory 4.1T Megabomb w/cans
    Exhaust Modified: No
    2002 CRF450R
    2007 CRF250R
  • User avatar
    jerbert
    Posts: 6
    Joined: Mon Jan 31, 2011 11:13 am

    by jerbert » Mon Jan 31, 2011 12:08 pm

    Year: 2008
    Elevation:2100/2700 ft
    Temperature Range:50/77F
    Backfire Screen:yes(It recommends to remove it?)
    Air Filter:Hifofiltro
    Pilot Jet:stock
    Main Jet:180
    Needle:jd red
    Needle Clip Position:4ยบ
    Fuel Screw Type:msr
    Fuel Screw Setting:1 3/4
    AP Modified:Is it the adjustment of the levy? If it is like that 2mm(serie 1.6mm)
    Leak Jet:35 (stock)
    AP Cover:It covers bud racing (economic)
    Exhaust Type: silence pro circuit
    Exhaust Modified:no
  • 1zippy
    Posts: 41
    Joined: Sat Jan 08, 2011 3:06 pm

    by 1zippy » Fri Feb 11, 2011 6:44 pm

    Year: 2005 crf450x 490cc Athena
    Elevation: 0--2000
    Temperature Range: 70-90
    Backfire Screen: yes
    Air Filter:stock open top
    Pilot Jet: 45
    Main Jet: 160
    Needle: nycs
    Needle Clip Position: 5th
    Fuel Screw Type: stock
    Fuel Screw Setting: 2
    AP Modified:
    Leak Jet: stock
    AP Cover: Boyeson
    Exhaust Type: powerbomb
    Exhaust Modified FMS
  • User avatar
    redrider250r
    Posts: 304
    Joined: Mon Mar 15, 2010 5:57 pm

    by redrider250r » Wed Apr 13, 2011 6:23 pm

    Year: 2009 CRF250r runs great!!
    Elevation: 900ft
    Temperature Range: 60-85
    Backfire Screen: removed
    Air Filter: K&N xtreme
    Pilot Jet: 42
    Main Jet: 175
    Needle: stock
    Needle Clip Position: stock
    Fuel Screw Type: MSR
    Fuel Screw Setting: 1 3/4 turns out
    Leak Jet: 60
    AP Cover: stock
    Exhaust Type: Leo Vince full system
    Exhaust Modified: no
    "If you don't crash, you ain't goin fast enough"
    "The faster you go, the smoother it gets. (Unless saying #1 comes into play)
    2009 CRF250R (mine)
    09 CRF250R (brothers)
    08 CRF250X (dad)

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