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71 posts
Jetting Database
  • sportytourer
    Posts:1
    Joined:Fri Oct 05, 2007 8:10 am

    by sportytourer » Fri Oct 05, 2007 8:28 am

    Year: 2005 CRF 450X
    Elevation: 450
    Temperature Range: 5-35 deg cel
    Airbox Modified Top: yes
    Airbox Modified Sides: no
    Air Filter: K&N
    Pilot Jet: 50
    Main Jet: 180
    Needle: NGGP
    Needle Clip Position: 4
    Fuel Screw Setting: 1 1/4
    Exhaust Type: white brothers full
    Pink Wire Modified:no

    With the CRF 450R cam installed, air filter and box modified, and full exhaust in addition to low elevation I found I needed more fuel to get more power. Thus had to richen substantially.

    Note:
    Tried a 185 main but was too rich and bogged from too much fuel. Tried 170 main and not enough fuel to keep up caused a bog. A 175 to 178 main may work also if you want to get little more snap and leaner but I am happy with the 180. Tried needle at 6th slot but was too rich. If I adjusted needle any more would try 3rd slot but not sure if going to adjust any more as pretty good.
    Last edited by sportytourer on Wed Aug 05, 2009 3:06 pm, edited 2 times in total.
  • User avatar
    Plissken
    Posts:128
    Joined:Tue Sep 25, 2007 9:33 pm

    by Plissken » Tue Oct 16, 2007 1:16 pm

    Last night I was completely stock, but as of today I have cut the top of the airbox off and am going to modify the baffles tonight.

    So, Given the above, I am a bit curious about my jetting. Would you guys suggest the following?

    Year: 2006
    Elevation: 1500-3000'
    Temperature Range: 60-80 F
    Smog (AIS): N/a
    Airbox Modified Top: Yes
    Airbox Modified Sides: No
    Backfire Screen: Stock
    Air Filter: Stock
    Pilot Jet: 45
    Main Jet: 165
    Needle: NCVS
    Needle Clip Position: 3rd
    Fuel Screw Type: Not sure here..installing tonight
    Fuel Screw Setting: ?
    AP Modified: N/A
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: White bros XCR
    Exhaust Modified: Baffle (2 Discs & Spark Arrester cut)
    Pink Wire Modified: No
    Last edited by Plissken on Thu Sep 25, 2008 11:37 am, edited 1 time in total.
  • User avatar
    fdexter
    Posts:103
    Joined:Wed Nov 14, 2007 11:01 am

    by fdexter » Thu Dec 06, 2007 8:40 pm

    Year: 06
    Elevation: 4,000-9000
    Temperature Range: 40-100 degrees
    Smog (AIS): (nosmog)
    Airbox Modified Top: yes
    Airbox Modified Sides: yes
    Backfire Screen:no
    Air Filter: twin air
    Pilot Jet: 48
    Main Jet: 162
    Needle: ncys
    Needle Clip Position: 3rd from top
    Fuel Screw Type: pro circuit
    Fuel Screw Setting:1 1/2 to 1 3/4
    AP Modified: no
    Leak Jet: adjustable(R&D ap kit)
    AP Cover:(R&D)
    Exhaust Type: fmf powercore slip on
    Exhaust Modified:yes
    Pink Wire Modified:no
    Last edited by fdexter on Wed Mar 05, 2008 10:01 am, edited 2 times in total.
  • pielet97
    Posts:62
    Joined:Wed Jul 18, 2007 3:55 pm

    by pielet97 » Sat Dec 08, 2007 12:03 pm

    Year: 2007
    Elevation: 0-400
    Temperature Range: 20-55
    Smog (AIS): JB Weld
    Airbox Modified Top: yes
    Airbox Modified Sides: yes
    Backfire Screen: gone
    Air Filter: twin air
    Pilot Jet: 48
    Main Jet: 175
    Needle: red
    Needle Clip Position: 4th - 5th in winter
    Fuel Screw Type: cfrs only
    Fuel Screw Setting: 1 1/4 - 2 1/4 winter
    AP Modified: no
    Leak Jet: 40
    AP Cover: QS2
    Exhaust Type: WB E2
    Exhaust Modified: no
    Pink Wire Modified: no
    2006 R cam
    Last edited by pielet97 on Wed Dec 31, 2008 4:39 pm, edited 5 times in total.
  • TXSUT
    Posts:351
    Joined:Mon Mar 19, 2007 6:26 am

    by TXSUT » Sat Dec 15, 2007 2:27 pm

    Year: 2006
    Elevation: 0-100'
    Temperature Range: 50F to 105F
    Smog (AIS): non-Cali
    Airbox Modified Top: No
    Airbox Modified Sides: Yes
    Backfire Screen: As Stock
    Air Filter: Stock
    Pilot Jet: 48
    Main Jet: 170
    Needle: JD Red
    Needle Clip Position: 4th
    Fuel Screw Type: CRF's Only ( Kouba)
    Fuel Screw Setting: 1 1/2 turns
    AP Modified: Yes (O-Ring)
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: White Brothers E2, stock header
    Exhaust Modified: Spark arrestor in
    Pink Wire Modified: No
    - Pete

    The doc said I have A.D.D., but I think he's full of...HEY LOOK, A CHICKEN!!!
  • jacko
    Posts:98
    Joined:Sun May 13, 2007 10:52 am

    by jacko » Fri Dec 28, 2007 10:44 am

    Year:2006
    Elevation: 800-2000 ft
    Temperature Range: -5 to 28c
    Smog (AIS): n/a
    Airbox Modified Top: bit of cutting and drilling
    Airbox Modified Sides: both cut out
    Backfire Screen:removed
    Air Filter: standard with filter skin
    Pilot Jet: stock
    Main Jet: 170
    Needle: JD Red
    Needle Clip Position: 5th
    Fuel Screw Type: stock
    Fuel Screw Setting: 1/34
    AP Modified: thick o ring +JD power surge kit
    Leak Jet:65
    AP Cover: boyesen quickshot
    Exhaust Type: fmf powerbomb with white bros E2 slip on
    Exhaust Modified:
    Pink Wire Modified:yes
    Stage 2 cam
    Last edited by jacko on Wed Jan 16, 2008 2:15 am, edited 2 times in total.
  • redhat
    Posts:6
    Joined:Thu Nov 01, 2007 4:52 pm

    by redhat » Fri Jan 04, 2008 10:57 am

    Year: 2006
    Elevation: 500-2000 ft
    Temperature Range: 40-90
    Smog (AIS): n/a
    Airbox Modified Top: yes
    Airbox Modified Sides: yes
    Backfire Screen: gone
    Air Filter: Twin Air
    Pilot Jet: 42
    Main Jet: 165
    Needle: JD red
    Needle Clip Position: 4
    Fuel Screw Type: Zip ty
    Fuel Screw Setting: 1.75
    AP Modified: fat o-ring
    Leak Jet: stock
    AP Cover: Quickshot II
    Exhaust Type: 05 R can stock header
    Exhaust Modified: n/a
    Pink Wire Modified: no
  • User avatar
    kena48
    Posts:78
    Joined:Wed Jan 09, 2008 11:18 am

    by kena48 » Sat Jan 19, 2008 3:33 pm

    Year: 2007
    Elevation: 1,250 (Oklahoma City)
    Temperature Range: 50 - 100
    Smog (AIS): JB Weld
    Airbox Modified Top: yes
    Airbox Modified Sides: yes
    Backfire Screen: removed
    Air Filter: Twin Air with Anti-backfire Coating
    Pilot Jet: 45 (stock)
    Main Jet: 165
    Needle: JD Kit Red
    Needle Clip Position: 4
    Fuel Screw Type: Aftermarket (from this site)
    Fuel Screw Setting: 1 & 1/4 out
    AP Modified: Yes via O-ring
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: stock
    Exhaust Modified: Yes - Baffle Removed
    Pink Wire Modified: no
    Last edited by kena48 on Mon Feb 04, 2008 9:52 am, edited 2 times in total.
  • User avatar
    Ripsnort
    Posts:158
    Joined:Tue Jan 23, 2007 4:13 pm

    by Ripsnort » Sat Jan 26, 2008 5:29 pm

    Year: 2006
    Elevation: 5000-9000
    Temperature Range :30-100
    Smog (AIS): N/A
    Airbox Modified Top: Yes
    Airbox Modified Sides: Yes
    Backfire Screen :Gone
    Air Filter: No Toil
    Pilot Jet: 48
    Main Jet: 170
    Needle: NCVS
    Needle Clip Position: 4th
    Fuel Screw Type: XR's Only
    Fuel Screw Setting: 2.25
    AP Modified: Thick O-ring
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: 450R Can
    Exhaust Modified: ProMoto Billet Tip
    Pink Wire Modified: No
    Last edited by Ripsnort on Sun Mar 22, 2009 11:32 am, edited 3 times in total.
    "Little by little in every way, I get better and better every day."

    '06 450X
    '03 XR50
    '99 Road King
    '99 KX60
    '00 KTM 380 MXC
  • Addicted
    Posts:51
    Joined:Wed Dec 19, 2007 12:12 pm

    by Addicted » Thu Feb 28, 2008 9:04 am

    Year: 2006
    Elevation: 3000-3500
    Temperature Range: 20-105
    Smog (AIS): N/A (49-Stater)
    Airbox Modified Top: Removed
    Airbox Modified Sides: Stock
    Backfire Screen: Stock
    Air Filter: Stock
    Pilot Jet: 48
    Main Jet: 165
    Needle: JD red
    Needle Clip Position: 4th
    Fuel Screw Type: CRF's Only
    Fuel Screw Setting: 1 1/2
    AP Modified: Thick 0-ring
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: Stock
    Exhaust Modified: Stock
    Pink Wire Modified: Stock
  • User avatar
    firehazard
    Posts:29
    Joined:Thu Oct 18, 2007 9:52 am

    by firehazard » Tue Mar 11, 2008 9:23 pm

    Year: 2006
    Elevation: 0-1000
    Temperature Range: 50-90
    Smog (AIS): n/a
    Airbox Modified Top: yes
    Airbox Modified Sides: yes
    Backfire Screen: gone
    Air Filter: UNI regular
    Pilot Jet: 42 (45 too rich)
    Main Jet: 165/170
    Needle: JD Red
    Needle Clip Position: middle
    Fuel Screw Type: MSR
    Fuel Screw Setting: 2 out
    AP Modified: yes
    Leak Jet: stock
    AP Cover: stock
    Exhaust Type: MRD Full (170 main)
    Exhaust Modified: Stock was (165 main)
    Pink Wire Modified: no
  • User avatar
    ChrisLuce
    Posts:616
    Joined:Thu Aug 23, 2007 6:27 am

    by ChrisLuce » Wed Mar 19, 2008 2:53 pm

    Year: 2006
    Elevation: 100-4000'
    Temperature Range: 4-F to 105F
    Smog (AIS): Disabled (JB Weld)
    Airbox Modified Top: Yes
    Airbox Modified Sides: Yes
    Backfire Screen: No
    Air Filter: Stock
    Pilot Jet: 50
    Main Jet: 165
    Needle: JD Red
    Needle Clip Position: 4th
    Fuel Screw Type: CRF's only "T" screw
    Fuel Screw Setting: 2 Turns
    AP Modified: Yes O-Ring
    Leak Jet: Stock
    AP Cover: Stock
    Exhaust Type: DR.D
    Exhaust Modified: Yes
    Pink Wire Modified: Yes
    Last edited by ChrisLuce on Thu Sep 23, 2010 6:16 pm, edited 4 times in total.
    Current Ride: 06' CRF 450X

    Image
  • CRF916
    Posts:1314
    Joined:Thu Jul 27, 2006 1:00 pm

    by CRF916 » Tue Apr 01, 2008 10:29 pm

    Year: 2006
    Elevation: 100-9000
    Temperature Range:
    Smog (AIS): JB'ed
    Airbox Modified Top: Cut
    Airbox Modified Sides: Cut
    Backfire Screen: Removed
    Air Filter: Stock
    Pilot Jet: 48
    Main Jet: 165
    Needle: ECVS
    Needle Clip Position: 3rd
    Fuel Screw Type: CRF's only "T" screw
    Fuel Screw Setting: 1 3/4
    AP Modified: yes
    Leak Jet:
    AP Cover: Yes..Boysen
    Exhaust Type: DR.D
    Exhaust Modified:
    Pink Wire Modified: Yes
    0'6 CRF450XXX

    Image
  • User avatar
    wmrice
    Posts:75
    Joined:Sun Apr 08, 2007 3:15 pm

    by wmrice » Thu Apr 03, 2008 8:04 pm

    Year: 2006
    Elevation:0-3500
    Temperature Range: 35-105 degrees
    Smog (AIS): blocked
    Airbox Modified Top: open
    Airbox Modified Sides:open
    Backfire Screen: gone
    Air Filter:uni
    Pilot Jet: 48
    Main Jet:172
    Needle: JD red
    Needle Clip Position:4th
    Fuel Screw Type: CRF's only
    Fuel Screw Setting:2 out
    AP Modified: thick o-ring
    Leak Jet:stock
    AP Cover: quick shot
    Exhaust Type: FMF factory 4.1
    Exhaust Modified: S/A insert
    Pink Wire Modified:yes
    Last edited by wmrice on Sun May 31, 2009 8:36 pm, edited 1 time in total.
  • terex26
    Posts:45
    Joined:Fri Dec 28, 2007 5:39 pm

    by terex26 » Sat Jul 12, 2008 1:51 pm

    Year: 06'
    Elevation: 100-10,000ft
    Temperature Range: 60-100
    Smog (AIS): removed
    Airbox Modified Top: cut out
    Airbox Modified Sides: cut
    Backfire Screen: yes
    Air Filter: Uni
    Pilot Jet: 45
    Main Jet:165
    Needle: ncys
    Needle Clip Position:3rd
    Fuel Screw Type: sunline
    Fuel Screw Setting: 2 out
    AP Modified: no
    Leak Jet: stock
    AP Cover: comparable to quickshot
    Exhaust Type: t-4 slip on
    Exhaust Modified: no
    Pink Wire Modified:no
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