Index: Carb Jetting Database
  • bbjustrom
    Posts: 24
    Joined: Thu Jul 03, 2008 4:12 am

    by bbjustrom » Tue Jul 29, 2008 7:44 pm

    Year: '04 CRF250X
    Elevation: 750-1000
    Temperature Range: 30-90
    Smog (AIS): N/A
    Airbox Modified Top: Yes Full
    Airbox Modified Sides: No
    Backfire Screen: Removed
    Air Filter: Stock&Twin Air
    Pilot Jet: 42
    Main Jet:160
    Needle: JD Jetting Red
    Needle Clip Position: 5th
    Fuel Screw Type: CRF's Only
    Fuel Screw Setting: 2 Turns
    AP Modified: Yes Large O-Ring
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: Stock
    Exhaust Modified: 11/16 Drilled
    Pink Wire Modified:Hooked Up
    '04 CRF250X
    '71 DT1 250
    '05 CRF70
    07 CRF150RB
    '04 TRX90
  • ThumperX
    Posts: 1256
    Joined: Sun Jan 14, 2007 11:44 am

    by ThumperX » Wed Feb 18, 2009 9:34 pm

    UPDATED with 06 R cam

    Year: 2005
    Elevation: 200-9500'
    Temperature Range: 30-110
    Smog (AIS): No
    Airbox Modified Top: Yes
    Airbox Modified Sides: Yes
    Backfire Screen: No
    Air Filter: UNI
    Pilot Jet: 45
    Main Jet: 172
    Needle: JD Red
    Needle Clip Position: 4th
    Fuel Screw Type: MSR
    Fuel Screw Setting: 1 3/4
    AP Modified: Yes, thick
    Leak Jet: Stock
    AP Cover:Stock
    Exhaust Type: WhiteBros E2
    Exhaust Modified:
    Pink Wire Modified: Yes
    05' CRF250X
    07' CR250R
    02' CRF450R
  • User avatar
    crf-av8r
    Posts: 4
    Joined: Mon Feb 16, 2009 7:05 pm

    by crf-av8r » Thu Feb 19, 2009 10:25 am

    Year: 2006
    Elevation: 3300'
    Temperature Range: 40-90
    Smog (AIS): N/A
    Airbox Modified Top: Yes
    Airbox Modified Sides: No
    Backfire Screen: Removed
    Air Filter: Stock (No-Toil oil)
    Pilot Jet:42
    Main Jet: 160
    Needle: JD Red
    Needle Clip Position:5th
    Fuel Screw Type: R&D
    Fuel Screw Setting: Apx 1.5
    AP Modified: Yes (Thick O-ring)
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: Stock
    Exhaust Modified: Baffle drilled out
    Pink Wire Modified:No

    crf-av8r
    _________________
  • RedFox
    Posts: 2
    Joined: Sat Feb 28, 2009 2:10 pm

    by RedFox » Sat Mar 07, 2009 7:23 am

    No Bog
    Know Power....

    Year: 2006
    Elevation: >4800'
    Temperature Range: 40-100
    Smog (AIS):
    Airbox Modified Top: Yes
    Airbox Modified Sides: No
    Backfire Screen: Removed
    Air Filter: Twin Air
    Pilot Jet: 42
    Main Jet: 152
    Needle: NCYS
    Needle Clip Position: 4th
    Fuel Screw Type: Stock
    Fuel Screw Setting: 2 turns out
    AP Modified: Yes
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: Stock
    Exhaust Modified: Removed Baffle
    Pink Wire Modified:No
  • User avatar
    rvdb
    Posts: 2
    Joined: Sun Jan 04, 2009 7:37 pm

    by rvdb » Tue Mar 10, 2009 2:05 pm

    Year: 2006
    Elevation: 0-5000
    Temperature Range: 30 to 95
    Smog (AIS): NA
    Airbox Modified Top: yes
    Airbox Modified Sides: no
    Backfire Screen: removed
    Air Filter: Twin Air
    Pilot Jet: 42
    Main Jet: 165
    Needle: JD red
    Needle Clip Position: 5th
    Fuel Screw Type: not sure
    Fuel Screw Setting: 2 1/8- 2 1/4 im working on it
    AP Modified: yes
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: stock head pipe, Jardine RT5 slip on
    Exhaust Modified: yes
    Pink Wire Modified:no
    Last edited by rvdb on Thu Jun 18, 2009 6:48 pm, edited 1 time in total.
  • mxersraz
    Posts: 147
    Joined: Sat Mar 07, 2009 10:58 am

    by mxersraz » Tue Mar 17, 2009 7:03 am

    Year: '05
    Elevation: sea level-1500
    Temperature Range: 50-100
    Smog (AIS): No
    Airbox Modified Top: Yes
    Airbox Modified Sides: No
    Backfire Screen: Removed
    Air Filter: High performance(DNA)
    Pilot Jet: 42
    Main Jet: 165
    Needle: JD red
    Needle Clip Position: #5
    Fuel Screw Type: stock
    Fuel Screw Setting: 2.0
    AP Modified: JD large o-ring
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: FMF Q4
    Exhaust Modified: no
    Pink Wire Modified:yes

    Runs perfect!!
    Last edited by mxersraz on Sat Jun 27, 2009 7:21 am, edited 1 time in total.
  • Harley
    Posts: 8
    Joined: Sat Mar 15, 2008 5:58 pm

    by Harley » Tue Apr 07, 2009 8:03 pm

    Year: 2008
    Elevation: 2000ft--6000ft
    Temperature Range: 45f to 90f
    Smog (AIS):removed (block off kit)
    Airbox Modified Top: yes (4 x 4)
    Airbox Modified Sides: no
    Backfire Screen:removed
    Air Filter: stock
    Pilot Jet: 45
    Main Jet: 162
    Needle: JD red
    Needle Clip Position: 4th
    Fuel Screw Type: CRF's only fuel screw
    Fuel Screw Setting: 2.5 turns
    AP Modified: no
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: stock
    Exhaust Modified: yes 3/4 in. drilled
    Pink Wire Modified:no
    Note: Starts way better now with the 45 pilot than the 42-pilot
    Last edited by Harley on Fri Jun 28, 2013 6:03 pm, edited 9 times in total.
    Honda 1983 V-65 Magna
    Honda 2008 XR650L
    Honda 2000 CR500R
    Honda 2008 CRF250X
    Honda 2004 CRF230F
    Honda 2009 CRF450X
  • User avatar
    ibow24
    Posts: 349
    Joined: Tue Mar 10, 2009 4:51 am

    by ibow24 » Mon Apr 13, 2009 6:30 am

    Year: 2007
    Elevation: 300-1,000'
    Temperature Range: 60-90F
    Smog (AIS): block off kit
    Airbox Modified Top: Cutout
    Airbox Modified Sides: NO
    Backfire Screen: Removed
    Air Filter: TwinAir Powerflow
    Pilot Jet: stock #42
    Main Jet: JD 165
    Needle: JD Red
    Needle Clip Position: 5th from top
    Fuel Screw Type: CRF's Only
    Fuel Screw Setting: 1-3/4 Out
    AP Modified: NO
    Leak Jet: Stock
    AP Cover: NO
    Exhaust Type: Stock header with FMF Q4 SS
    Exhaust Modified: Heat wrapped header
    Pink Wire Modified:NO
    _________________
  • User avatar
    Codeman00
    Posts: 745
    Joined: Wed Nov 21, 2007 9:17 am

    by Codeman00 » Tue Jun 30, 2009 4:24 pm

    Year: 2006
    Elevation: 500-1000 ft
    Temperature Range: 50- 90 degrees F
    Smog (AIS): N/A on my bike
    Airbox Modified Top: Yes, 4x4
    Airbox Modified Sides: No
    Backfire Screen: No, 250R exhaust
    Air Filter: Twin Air
    Pilot Jet: 42
    Main Jet: 165
    Needle: JD Jetting Red
    Needle Clip Position: 5th
    Fuel Screw Type: CRF'sONLY
    Fuel Screw Setting: 2 1/4 turns (summer time)
    AP Modified: No (didn't like it...too much "jerkiness")
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: 2005 250R
    Exhaust Modified: with ProtoBillet End Cap / Spark Arrestor
    Pink Wire Modified: No
    Cam: 2005 CRF250R (same jetting with 250X cam)
    Last edited by Codeman00 on Thu Jul 01, 2010 10:57 am, edited 1 time in total.
  • jbowens
    Posts: 65
    Joined: Sat Nov 29, 2008 12:35 pm

    Jetting

    by jbowens » Sun Jul 12, 2009 2:45 pm

    Year: 2005 CRF 250X
    Elevation:0 to 900
    Temperature Range: 75-100
    Smog (AIS): No
    Airbox Modified Top: Yes
    Airbox Modified Sides: No
    Backfire Screen: removed
    Air Filter: twin air
    Pilot Jet: Need to know
    Main Jet: Need to know
    Needle: Need to know
    Needle Clip Position: Need to know
    Fuel Screw Type: t handle
    Fuel Screw Setting: Need to know
    AP Modified: no
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: x head w/ r can
    Exhaust Modified: N/A
    Pink Wire Modified: no
  • kirkd2
    Posts: 48
    Joined: Mon May 05, 2008 5:15 pm

    by kirkd2 » Sun Dec 27, 2009 4:06 pm

    Year: 2006
    Elevation: 2000 - 6000 ft
    Temperature Range: 30 - 100 degrees F
    Smog (AIS): JB Weld
    Airbox Modified Top: Yes
    Airbox Modified Sides: No
    Backfire Screen: No
    Air Filter: No Toil
    Pilot Jet: 42
    Main Jet: 165
    Needle: JD Jetting Red
    Needle Clip Position: 4th
    Fuel Screw Type: Thumb
    Fuel Screw Setting: 2 1/4 turns
    AP Modified: Yes - thin
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: FMF Powerbomb
    Stock muffler - baffle removed w/spark arrestor
    Exhaust modified: Heat wrap
    Cam: HotCams Stage 1
    Pink wire modified: Yes
  • User avatar
    oscarbella
    Posts: 17
    Joined: Fri Aug 28, 2009 2:05 pm

    by oscarbella » Sun Feb 07, 2010 8:42 am

    Year: 250X 2007
    Elevation: 5000 - 6000 ft
    Temperature Range: 60 - 110 F
    Smog (AIS): N/A
    Airbox Modified Top: Cutout in frame
    Airbox Modified Sides: No
    Backfire Screen: Removed
    Air Filter: Twin Air
    Pilot Jet: 42
    Main Jet: 165
    Needle: JD Red
    Needle Clip Position: 4th
    Fuel Screw Type: OEM
    Fuel Screw Setting: 2 turns
    AP Modified: N/A
    Leak Jet: Stock
    AP Cover: N/A
    Exhaust Type: Yoshimura RS2 Stainless Slip on
    Exhaust Modified: No
    Pink Wire Modified: No
    Last edited by oscarbella on Wed Sep 26, 2012 2:23 pm, edited 1 time in total.
    '07 CRF250X
    Cylinder Works 270 Big Bore kit
    Kibblewhite Black Diamond VAlves and springs.
    JD Jet Kit + CCC Airbox Mod
    Yoshimura RS2 Slip on.

    '07 CRF230F - stock standard (Sold)
    '07 CRF150RB - The Youngsta's Ride (Sold)
  • jhawk14200
    Posts: 19
    Joined: Wed Feb 03, 2010 7:46 am

    by jhawk14200 » Tue Mar 16, 2010 2:40 pm

    Year: 2005 crf250x
    Elevation: 0-1000
    Temperature Range: 55-90
    Airbox Modified Top: yes
    Airbox Modified Sides: no
    Backfire Screen: still in
    Air Filter: stock
    Pilot Jet: 45
    Main Jet: 160
    Needle: Red JD kit
    Needle Clip Position: 5th
    Fuel Screw Type: crfs only T
    Fuel Screw Setting: 1 3/4
    AP Modified: no
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: stock
    Exhaust Modified: Baffle cut
    Pink Wire Modified:no
    Last edited by jhawk14200 on Wed Jun 22, 2011 4:54 am, edited 2 times in total.
    2005 CRF250X Jd kit, 160 Main, 42 Pilot, CRFSONLY fuel screw 1 1/2 turns out, exhaust drilled, airbox mod.

    2004 CRF70F
    2008 CRF80F
    2006 CRF100F
    2005 CRF150F
  • User avatar
    jtsurfs
    Posts: 412
    Joined: Sat Aug 05, 2006 4:14 pm

    by jtsurfs » Tue Mar 16, 2010 3:50 pm

    Year: 2006 CRF450X
    Elevation: 0-5500
    Temperature Range: 55-100
    Airbox Modified Top: Yes
    Airbox Modified Sides: No
    Backfire Screen: Gone
    Air Filter: TwinAir
    Pilot Jet: 45
    Main Jet: 170
    Needle: NCVS
    Needle Clip Position: 4th
    Fuel Screw Type: CRFs only
    Fuel Screw Setting: 1 3/4
    AP Modified: Yes
    Leak Jet: 55
    AP Cover: Stock
    Exhaust Type: Two Brothers M7
    Exhaust Modified: Header Wrapped
    Pink Wire Modified: No
  • User avatar
    speeedracer62
    Posts: 11
    Joined: Mon Oct 30, 2006 11:25 am

    by speeedracer62 » Wed Mar 31, 2010 5:27 am

    Year: '06 250X
    Elevation: 0-3000
    Temperature Range: 60-100
    Smog (AIS): no smog
    Airbox Modified Top: Yes
    Airbox Modified Sides: No
    Backfire Screen: No
    Air Filter: Twin Air
    Pilot Jet: 48
    Main Jet: 165
    Needle: JD Red
    Needle Clip Position: 5th from top
    Fuel Screw Type: R&D Flex-Jet
    Fuel Screw Setting: 2 1/2 turns
    AP Modified: Yes
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: FMF Power Bomb header, stock muffler
    Exhaust Modified: baffle removed
    Pink Wire Modified: no

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