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

    Jetting Database

    by crfsonly » Mon Apr 09, 2007 5:19 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 7:36 pm, edited 1 time in total.
    OEM Parts for Honda - Yamaha - Suzuki - Kawasaki: http://yeltrik.com
    _________________
    CRF Parts and Accessories: http://crfsonly.com
  • User avatar
    dirty mike
    Posts: 265
    Joined: Mon Aug 14, 2006 9:11 pm

    by dirty mike » Mon Apr 09, 2007 5:39 pm

    Year:07
    Elevation:1000-5000
    Temperature Range:25-100
    Backfire Screen:yes
    Air Filter: uni
    Pilot Jet: 45
    Main Jet:stock
    Needle:stock
    Needle Clip Position:stock
    Fuel Screw Type:white bros
    Fuel Screw Setting:approx 1 1/2 to 2
    AP Modified:no
    Leak Jet:stock
    AP Cover:no
    Exhaust Type:white bros e2 with s/a
    Exhaust Modified:e2
    06 crf450x
    e2 pipe
    flatland rad guards
    flatland skid plate
    07 150r expert
  • User avatar
    mikey526
    Posts: 1176
    Joined: Sun Apr 01, 2007 5:29 pm

    by mikey526 » Thu Aug 30, 2007 10:06 am

    Year: 07
    Elevation: 0-1500
    Temperature Range: 70's-90's
    Backfire Screen: yes
    Air Filter: Twin Air Powerflow
    Pilot Jet: stock
    Main Jet: stock
    Needle:stock
    Needle Clip Position: stock
    Fuel Screw Type: Zip-Ty
    Fuel Screw Setting:2 1/4 I believe
    AP Modified: no
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: stock
    Exhaust Modified: no
    Last edited by mikey526 on Sun Dec 30, 2007 7:21 am, edited 1 time in total.
  • ScottX
    Posts: 49
    Joined: Thu Dec 15, 2005 5:44 pm

    by ScottX » Thu Aug 30, 2007 1:09 pm

    Year:2007
    Elevation:0 to 3000
    Temperature Range:65-100
    Backfire Screen:yes
    Air Filter:Twin air
    Pilot Jet:45
    Main Jet:130
    Needle:stock
    Needle Clip Position:3rd
    Fuel Screw Type:crfs only
    Fuel Screw Setting:1 1/2
    AP Modified:yes solid wire
    Leak Jet:45
    AP Cover:no
    Exhaust Type:BBR HT
    Exhaust Modified:BBR header and slip on
  • ThumperX
    Posts: 1256
    Joined: Sun Jan 14, 2007 11:44 am

    by ThumperX » Tue Mar 04, 2008 6:51 pm

    Year: 2008
    Elevation: 500-6000'
    Temperature Range: 45-100*
    Backfire Screen: Yes, but will remove
    Air Filter: Stock
    Pilot Jet: 42
    Main Jet: 140
    Needle: JD Red
    Needle Clip Position: 3rd
    Fuel Screw Type: Stock
    Fuel Screw Setting: 1 1/2
    AP Modified: Yes, thick ring
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: Stock
    Exhaust Modified: No
    05' CRF250X
    07' CR250R
    02' CRF450R
  • User avatar
    mikey526
    Posts: 1176
    Joined: Sun Apr 01, 2007 5:29 pm

    by mikey526 » Sat Mar 22, 2008 6:19 pm

    Year: 2007
    Elevation: 0-1500
    Temperature Range: -10 to 90
    Backfire Screen: not any more
    Air Filter: Twin Air powerflow
    Pilot Jet: 40
    Main Jet: 135 (summer) or 138 (spring/fall)
    Needle: NHNT currently
    Needle Clip Position: 3rd or 4th
    Fuel Screw Type: Zip-Ty
    Fuel Screw Setting: 2.25-2.5 turns out
    AP Modified: Yes
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: stock
    Exhaust Modified: nope
    Image
  • hondapunk53
    Posts: 154
    Joined: Thu May 29, 2008 8:38 pm

    Re: HOW TO: CARB JETTING DATABASE

    by hondapunk53 » Thu Jul 10, 2008 10:17 am

    Year:2008
    Elevation:250
    Temperature Range:70-95
    Backfire Screen:not for long
    Air Filter:stock
    Pilot Jet:42
    Main Jet:
    Needle:stock
    Needle Clip Position:stock
    Fuel Screw Type:stock
    Fuel Screw Setting:2 1/2 turns
    AP Modified:not yet
    Leak Jet:stock
    AP Cover: stock
    Exhaust Type: stock
    Exhaust Modified: nope
  • HRC_NICK_11
    Posts: 21
    Joined: Sat Sep 15, 2007 8:29 am

    by HRC_NICK_11 » Thu Aug 28, 2008 6:28 pm

    Year: 2008
    Elevation: 900
    Temperature Range: 80ish
    Backfire Screen: yes stock
    Air Filter: stock or no-toil
    Pilot Jet: 45
    Main Jet: stock
    Needle: stock
    Needle Clip Position: stock
    Fuel Screw Type: scott
    Fuel Screw Setting: 2 out
    AP Modified: just large o-ring
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: stock
    Exhaust Modified: stock

    The 45 pilot helps a ton with starting. I installed the JD kit but like the stock jetting a bit more. More hit and reved faster. I could have adjusted the JD kit, I think it was rich but I was happy with the stock settings with the 45. I might try the JD kit for ice racing a softer hit may make the bike easier to ride on the ice.
  • User avatar
    mac 101
    Posts: 3
    Joined: Sat Feb 28, 2009 12:45 pm

    by mac 101 » Wed Mar 04, 2009 1:54 pm

    Year: 08
    Elevation: 0-1000
    Temperature Range: 10-40
    Backfire Screen: stock
    Air Filter: no toil
    Pilot Jet: 45
    Main Jet: 138
    Needle: stock
    Needle Clip Position: stock
    Fuel Screw Type: stock
    Fuel Screw Setting: 2-2 1/2
    AP Modified: not yet
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type:hgs
    Exhaust Modified: system
  • Honda53
    Posts: 10
    Joined: Tue Jul 22, 2008 12:22 pm

    by Honda53 » Tue Mar 30, 2010 5:46 pm

    Year: 2007
    Elevation: 600ish
    Temperature Range: 30-90*F
    Backfire Screen: Yes
    Air Filter: Twin Air and OEM
    Pilot Jet: 48 winter 45 summer
    Main Jet: 138 winter 135 summer
    Needle: Stock
    Needle Clip Position: Stock
    Fuel Screw Type: Adjustable, Talon brand (I think)
    Fuel Screw Setting: 1 3/4
    AP Modified: Wired - Best result
    Leak Jet: 45, AP must be wired to get a strong squirt that doesn't last too long
    AP Cover: stock (NGK 858 3.7 AP diaphram [ground nipple basically])
    Exhaust Type: Stock
    Exhaust Modified: Stock
    Bog: Nope :D
  • User avatar
    redrider250r
    Posts: 304
    Joined: Mon Mar 15, 2010 5:57 pm

    by redrider250r » Mon Jun 14, 2010 7:11 pm

    Year: 2007
    Elevation: 0-2000
    Temperature Range: 50-90
    Backfire Screen: yes
    Air Filter: No-toil
    Pilot Jet: stock
    Main Jet: stock
    Needle: stock
    Needle Clip Position: stock
    Fuel Screw Type: stock
    Fuel Screw Setting: 2 I beleive
    AP Modified: no
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: stock
    Exhaust Modified: PMB end cap w/ spark arrestor
    -Bike is tough to start when cold and bogs coming out of turns. Any suggestions on jetting??
    _________________
    "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)
  • User avatar
    sak384
    Posts: 30
    Joined: Sun Jul 25, 2010 2:49 pm

    by sak384 » Mon Sep 20, 2010 8:00 pm

    Year: 2007
    Elevation: sea level -200'
    Temperature Range: 40-100
    Backfire Screen: yes
    Air Filter: twin air
    Pilot Jet: 48
    Main Jet:140
    Needle: jd red
    Needle Clip Position:5th from top
    Fuel Screw Type: flex screw
    Fuel Screw Setting: 2.25
    AP Modified: yes
    Leak Jet: 60
    AP Cover: QS2
    Exhaust Type: stock
    Exhaust Modified: fmf powercore 4

    Starts 1st kick hot or cold. No bog ever. Idles perfectly no hanging idle. Works connection tach rpm at idle 1950-2250. Throttle response crisp. Roll on response perfect. Off idle response crisp. No stalling 10yr old kicks over bike with 1 kick and no hassle. Runs flawless.
  • Rabbit566
    Posts: 1
    Joined: Wed Apr 27, 2016 1:55 pm

    by Rabbit566 » Thu Jun 02, 2016 8:18 am

    Year: 2015
    Elevation: 500-800
    Temperature Range: 60-80
    Backfire Screen: stock
    Air Filter: stock
    Pilot Jet: 45 stock_38
    Main Jet: 140 stock
    Needle: NMQT stock
    Needle Clip Position: 4th from top stock_3rd
    Fuel Screw Type: R&D Racing Flex Jet
    Fuel Screw Setting: 2
    AP Modified: New design n/a
    Leak Jet: stock
    AP Cover: stock
    AP timing: 1/8-1/4 turn sooner
    Exhaust Type: stock
    Exhaust Modified: n/a

    Bike runs great now. the timing on the ap is what really made the deference off idle. I may go one size larger on pilot and main.
  • dharsay
    Posts: 5
    Joined: Sun Oct 28, 2018 11:31 am

    Re: Jetting Database

    by dharsay » Sun Nov 18, 2018 6:27 pm

    Year:2015 CRF150RB
    Elevation: 1200ft
    Temperature Range: 50-105F
    Backfire Screen: no
    Air Filter: K&N with modified airbox
    Pilot Jet: 40 (stock 38)
    Main Jet: 142 (stock 140)
    Needle: NHNT (stock NMQT)
    Needle Clip Position: 4th position from top
    Fuel Screw Type: Tokyo Mods
    Fuel Screw Setting: 2 turns
    AP Modified: No just played with spring screw adjustment slightly
    Leak Jet: 60 (stock was 65)
    AP Cover: Quick Shot 2
    Exhaust Type: Yoshimura slip on
    Exhaust Modified: removed dB killer insert, installed O2 bung

    Notes:
    Supermoto setup with wideband installed for tuning. OEM -- Start was fine but had lots of carburation issues especially acceleration stumble. Installed a simple Toyo mods kit which looks like it had stock needles for older carbs, smaller leak jet, much bigger slow jet, etc. Acceleration was better but it was very rich at idle once warmed up and difficult to start and tool lean at the top and past 1/2 throttle, still lean stumble when opening throttle too fast. Above is where we ended up, will update if changed.

Who is online

Users browsing this forum: No registered users and 1 guest