Jetting Specifications

We have developed a list of jetting specifications that we believe will help your bike run its very best. Please remember that sometimes the stock OEM jetting will work just fine, other times you may have to make an adjustment, so use our suggestions below as a guide to help with your jetting problem.

For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. We recommend Maxima Castor 927 High Performance 2-Cycle Oil.

For four-stroke bikes, our jetting specs are for premium pump gas at 0-1500 ft altitude at 70-85 degrees temperature.

Please Note: The stock OEM jetting for your specific model is listed first, followed by our recommended jetting underneath that model.

      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CRF150R
        138
        38
        NMQS
        3
        2.5
        1.5
        58
      • Pro Circuit
        138
        45
        NMQS
        3
        2.5
        58
      • CRF250R
        188
        42
        NMGU
        3
        1.5
        70
      • Pro Circuit
        172
        42
        NMGU
        3
        2
        48
      • CRF250X
        130
        40
        NCYU
        2
        2
        65
      • Pro Circuit
        158
        42
        NCYS
        4
        2.25
        55
      • CRF450X
        145
        45
        NCVU
        2
        2.5
        70
      • Pro Circuit
        155
        45
        NCYS
        3
        2.25
        Needle #16204-MEN-671
        70
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ85
        138
        45
        NBKF
        2
        2.375
      • Pro Circuit
        135
        42
        NBKF
        2
        2
      • YZ125
        410
        40
        6CHY5-80
        4
        2.25
        4
      • Pro Circuit
        410
        35
        6CHY5-80
        3
        1.75
        4
      • YZ250
        178
        50
        N3EW
        2
        1
        50
        7
      • Pro Circuit
        175
        48
        N3EW
        2
        1
        50
        7
      • YZ250F
        178
        42
        NFPR
        5
        2.375
        70
      • Pro Circuit
        175
        42
        NFPN
        4
        2
        60
      • YZ450F
        160
        45
        NFLR
        3
        1.25
        55
      • Pro Circuit
        160
        42
        NFLP
        5
        2.5
        50
      • WR250F
        4
      • Pro Circuit
      • WR450F
        162
        45
        NFNT
        fix
        2.25
        60
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        2
        2
      • Pro Circuit
        125
        48
        NAAH
        2
        2
      • RM250
        168
        48
        NECJ
        3
        1
        45
        7
      • Pro Circuit
        168
        48
        NECJ
        3
        1.5
        48
        7
      • RM-Z250
        162
        45
        NLCT
        3
        2.25
        1.5
        40
      • Pro Circuit
        160
        40
        NKZT
        5
        2.25
        45
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX65
        190
        25
        5GSP68
        3
        1.5
        1.5
        O-0
      • Pro Circuit
        200
        27.5
        5GSP68
        2
        1.5
        1.5
        O-0
      • KX85
        140
        45
        NAPE
        3
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPE
        2
        1.375
        3.5
      • KX100
        138
        45
        NAPF
        4
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPF
        2
        1.375
        3.5
      • KX250F
        182
        40
        NHJT
        4
        1.75
        55
      • Pro Circuit
        170
        42
        NCYS
        3
        2.5
        50
      • KLX450
        145
        45
        NLZU
        Fixed
        1.75
        50
      • Pro Circuit
        155
        40
        NCYN
        1
        2
        remove snorkel
        50
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 65 SX
        210
        20
        2
        3.5
      • Pro Circuit
        195
        20
        1
        2
      • KTM 250 SX-F
        175
        40
        OBETP
        5
        1.25
        1.5
      • Pro Circuit
        178
        40
        OBETP
        4
        2
        1.5
        wire acc pump
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR85R
        142
        45
        NFSF
        3
        1.5
      • Pro Circuit
        142
        42
        NFSF
        4
      • CRF150R
        138
        38
        NMQS
        3
        2.5
        1.5
        58
      • Pro Circuit
        138
        45
        NMQS
        3
        2.5
        1.5
        58
      • CRF250R
        188
        42
        NMGU
        3
        1.5
        70
      • Pro Circuit
      • CRF250X
        130
        40
        NCYU
        2
        2
        65
      • Pro Circuit
      • CRF450R
        178
        42
        NJYR
        3
        1.75
        50
      • Pro Circuit
      • CRF450X
        145
        45
        NCVU
        2
        2.5
        70
      • Pro Circuit
        155
        45
        NCYS
        3
        2.25
        Needle #16204-MEN-671
        70
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ85
        138
        45
        NBKF
        2
        2.375
      • Pro Circuit
        135
        42
        NBKF
        2
        2
      • YZ125
        410
        40
        6CHY5-80
        4
        2.25
        4.0
      • Pro Circuit
        410
        35
        6CHY5-80
        3
        1.75
        4.0
      • YZ250
        178
        50
        N3EW
        2
        1
        50
        7.0
      • Pro Circuit
        175
        48
        N3EW
        2
        1
        50
        7.0
      • YZ250F
        178
        42
        NFPR
        5
        2.375
        70
      • Pro Circuit
        175
        42
        NFPN
        4
        2
        60
      • YZ450F
        160
        45
        NFLR
        3
        1.25
        55
      • Pro Circuit
        160
        42
        NFLP
        5
        2.5
        50
      • WR250F
        4
      • Pro Circuit
      • WR450F
        162
        45
        NFNT
        fix
        2.25
        60
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        2
        2
      • Pro Circuit
        125
        48
        NAAH
        2
        2
      • RM250
        168
        48
        NECJ
        3
        1
        45
        7.0
      • Pro Circuit
        168
        48
        NECJ
        3
        1.5
        48
        7.0
      • RM-Z250
        162
        45
        NLCT
        3
        2.25
        1.5
        40
      • Pro Circuit
        162
        45
        NLCT
        4
        2.25
        40
      • RM-Z450
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX65
        190
        25
        5GSP68
        3
        1.5
        1.5
        O-0
      • Pro Circuit
        200
        27.5
        5GSP68
        2
        1.5
        1.5
        O-0
      • KX85
        140
        45
        NAPE
        3
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPE
        2
        1.375
        3.5
      • KX100
        138
        45
        NAPF
        4
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPF
        2
        1.375
        3.5
      • KX250F
        182
        40
        NHJT
        4
        1.75
        55
      • Pro Circuit
        170
        42
        NCYS
        3
        2.5
        50
      • KX450F
        175
        42
        NCVR
        4
        1.75
        70
      • Pro Circuit
        175
        42
        NCVR
        4
        2
        55
      • KLX450
        145
        45
        NLZU
        Fixed
        1.75
        50
      • Pro Circuit
        155
        40
        NCYN
        1
        2
        remove snorkel
        50
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 65 SX
        200
        25
        4
        1.5
      • Pro Circuit
        220
        32.5
        4
        1.5
      • KTM 250 SX-F
        175
        40
        OBETP
        5
        1.25
        1.5
      • Pro Circuit
        178
        40
        OBETP
        4
        2
        1.5
        wire acc pump
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR85R
        142
        45
        NFSF
        3
        1.5
      • Pro Circuit
        142
        42
        NFSF
        4
      • CRF150R
        135
        40
        NHNT
        3
        2
        1.5
        60
      • Pro Circuit
        140
        42
        NHNR
        3
        2
        1.5
        50
        Needle #16201-KSE-672
      • CR125R
        430
        55
        3
        2
      • Pro Circuit
        410
        50
        STK
        2
        1.5
      • CR250R
        420
        40
        6DGY26-65
        3
        2
        4.0
        S-7
      • Pro Circuit
        410
        37.5
        6DGY26-65
        2
        1.5
        4.0
        S-7
      • CRF250R
        175
        42
        NKBT
        3
        2.25
        70
      • Pro Circuit
        170
        45
        NKBT
        3
        1.5
        45
      • CRF250X
        130
        40
        NCYU
        2
        2
        65
      • CRF450R
        178
        42
        NJYR
        3
        1.75
        50
      • Pro Circuit
        178
        42
        NJYR
        3
        1.75
        50
      • Mammoth
        175
        42
        NJYR
        2
        50
      • CRF450X
        145
        45
        NCVU
        2
        2.5
        70
      • Pro Circuit
        155
        45
        NCYS
        3
        2.25
        70
        Needle #16204-MEN-671
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ85
        138
        45
        NBKF
        2
        2.375
      • Pro Circuit
        135
        42
        NBKF
        2
        2
      • YZ125
        410
        40
        6CHY5-80
        4
        2.25
        4.0
      • Pro Circuit
        410
        35
        6CHY5-80
        3
        1.75
        4.0
      • YZ250
        178
        50
        N3EW
        2
        1
        50
        7.0
      • Pro Circuit
        175
        48
        N3EW
        2
        1
        50
        7.0
      • YZ250F
        178
        42
        OBELQ
        S
        80
      • Pro Circuit
        180
        42
        OBELQ
        3
        2
        60
      • YZ450F
        160
        45
        NFLR
        3
        1.25
        55
      • Pro Circuit
        165
        42
        NFLR
        5
        2
        50
      • WR250F
      • Pro Circuit
      • WR450F
        160
        45
        NFNT
        fix
        1.5
        60
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        2
        2
      • Pro Circuit
        125
        48
        NAAH
        2
        2
      • RM125
        370
        42.5
        6CHY17-6
        3
        2
      • Pro Circuit
        370
        40
        6CHY17-6
        2
        1.75
      • RM250
        168
        48
        NECJ
        3
        1
        45
        7.0
      • Pro Circuit
        168
        48
        NECJ
        3
        1.5
        48
        7.0
      • RM-Z250
        162
        45
        NLCT
        3
        2.25
        1.5
        40
      • Pro Circuit
        162
        45
        NLCT
        4
        2.25
        40
      • RM-Z450
        170
        42
        NCYR
        3
        2
        35
      • Pro Circuit
        170
        42
        NCYR
        3
        2
        35
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX65
        190
        25
        5GSP68
        3
        1.5
        1.5
        O-0
      • Pro Circuit
        200
        27.5
        5GSP68
        2
        1.5
        1.5
        O-0
      • KX85
        140
        45
        NAPE
        3
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPE
        2
        1.375
        3.5
      • KX100
        138
        45
        NAPF
        4
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPF
        2
        1.375
        3.5
      • KX250
        162
        50
        NFTG
        3
        1.75
        50
        8.0
      • Pro Circuit
        162
        48
        NFTG
        4
        1.5
        50
      • KX250F
        182
        40
        NHJT
        4
        1.75
        55
      • Pro Circuit
        170
        42
        NCYS
        3
        2.5
        50
      • KX450F
        175
        42
        NCVR
        4
        1.75
        70
      • Pro Circuit
        175
        42
        NCVR
        4
        2
        55
      • Mammoth
        172
        42
        NCVR
        3
        1.5
        55
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 65 SX
        200
        25
        4
        1.5
      • Pro Circuit
        220
        32.5
        4
        1.5
      • KTM 250 SX-F
        175
        40
        OBETP
        5
        1.25
        1.5
        No Leak
      • Pro Circuit
        178
        40
        OBETP
        4
        2
        1.5
        No Leak
        wire acc pump
      • KTM 450 XC
        178
        42
        No Leak
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR85R
        142
        45
        NFSF
        3
        1.5
      • Pro Circuit
        142
        42
        NFSF
        4
      • CR125R
        430
        55
        3
        2
      • Pro Circuit
        410
        50
        STK
        2
        1.5
      • CR250R
        420
        40
        6DGY26-65
        3
        2
        4.0
        S-7
      • Pro Circuit
        410
        37.5
        6DGY26-65
        2
        1.5
        4.0
        S-7
      • CRF250R
        172
        40
        NHFS
        3
        1.75
        70
        Raise Float 2mm
      • Pro Circuit
        170
        42
        NHFT
        3
        2
        45
        Remove Float Bowl Baffle
      • CRF250X
        130
        40
        NCYU
        2
        2
        65
      • Pro Circuit
        158
        42
        NCYS
        4
        2.25
        55
        Needle #16204-MEN-671
      • CRF450R
        168
        42
        NCYQ
        4
        1.875
        55
      • Pro Circuit
        168
        42
        NCYQ
        4
        2.25
        55
      • CRF450X
        145
        45
        NCVU
        2
        2.5
        70
      • Pro Circuit
        155
        45
        NCYS
        3
        2.25
        70
        Needle #16204-MEN-671
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ85
        138
        45
        NBKF
        2
        2.375
      • Pro Circuit
        135
        42
        NBKF
        2
        2
      • YZ125
        410
        40
        6CHY5-80
        4
        2.25
        4.0
      • Pro Circuit
        410
        35
        6CHY5-80
        3
        1.75
        4.0
      • YZ250
        178
        50
        N3EJ
        2
        1
        50
        7.0
      • Pro Circuit
        175
        48
        N3EJ
        2
        1
        50
        7.0
      • YZ250F
        178
        42
        OBELQ
        3
        80
      • Pro Circuit
        180
        42
        OBELQ
        3
        2
        60
      • YZ450F
        165
        42
        NFPR
        4
        2
        55
      • Pro Circuit
        170
        50
        NFPR
        5
        2.5
        50
      • WR250F
      • Pro Circuit
      • WR450F
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        2
        2
      • Pro Circuit
        125
        48
        NAAH
        2
        2
      • RM125
        370
        42.5
        6CHY17-6
        3
        2
      • Pro Circuit
        370
        40
        6CHY17-6
        2
        1.75
      • RM250
        168
        48
        NECJ
        3
        1
        45
        7.0
      • Pro Circuit
        168
        48
        NECJ
        3
        1.5
        48
        7.0
      • RM-Z250
        178
        40
        OBEKS
        4
        60
      • Pro Circuit
        165
        42
        OBEKR
        4
        2
        60
        Needle # K1618-70069
      • RM-Z450
        170
        42
        NCYR
        3
        2
        35
      • Pro Circuit
        168
        45
        NCVR
        3
        2
        65
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX65
        190
        25
        5GSP68
        3
        1.5
        1.5
        O-0
      • Pro Circuit
        200
        27.5
        5GSP68
        2
        1.5
        1.5
        O-0
      • KX85
        140
        45
        NAPE
        3
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPE
        2
        1.375
        3.5
      • KX100
        138
        45
        NAPF
        4
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPF
        2
        1.375
        3.5
      • KX250
        162
        50
        NFTG
        3
        1.75
        50
        8.0
      • Pro Circuit
        162
        48
        NFTG
        4
        1.5
        50
      • KX250F
        180
        40
        NCYU
        3
        1.75
        60
      • Pro Circuit
        170
        42
        NCYS
        3
        3
        50
      • KX450F
        175
        42
        NCVR
        3
        1.75
        70
      • Pro Circuit
        175
        42
        NCVR
        3
        2
        55
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR85R
        142
        45
        NFSF
        3
        1.5
      • Pro Circuit
        142
        42
        NFSF
        4
      • CR125R
        430
        55
        3
        2
      • Pro Circuit
        410
        50
        STK
        2
        1.5
      • CR250R
        420
        40
        6DGY26-65
        3
        2
        4.0
        S-7
      • Pro Circuit
        410
        37.5
        6DGY26-65
        2
        1.5
        4.0
        S-7
      • CRF250R
        170
        42
        NCYQ
        3
        1.75
        70
      • Pro Circuit
        170
        42
        NCYQ
        3
        1.5
        70
      • CRF250X
        4
      • Pro Circuit
        158
        42
        NCYS
        4
        2.25
        55
        Needle #16204-MEN-671
      • CRF450R
        168
        42
        NGGQ
        4
        1.875
      • Pro Circuit
        168
        42
        NGGQ
        4
        2.25
      • CRF450X
        145
        45
        NCVU
        2
        2.5
        70
      • Pro Circuit
        155
        45
        NCYS
        3
        2.25
        70
        Needle #16204-MEN-671
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ85
        138
        45
        NBKF
        2
        2.375
      • Pro Circuit
        135
        42
        NBKF
        2
        2
      • YZ125
        410
        40
        6CHY5-80
        4
        2.25
        4.0
      • Pro Circuit
        410
        35
        6CHY5-80
        3
        1.75
        4.0
      • YZ250
        178
        50
        N3EJ
        2
        1
        50
        7.0
      • Pro Circuit
        175
        48
        N3EJ
        2
        1
        50
        7.0
      • YZ250F
        182
        42
        OBELR
        4
        1.875
        90
      • Pro Circuit
        180
        45
        OBELR
        4
        1.875
        90
      • YZ450F
        165
        45
        NFLR
        4
        72
      • Pro Circuit
        165
        45
        NFLR
        4
        1.5
        72
      • WR250F
        168
        40
        OBERP
        4
        95
      • Pro Circuit
        180
        42
        OBELR
        4
        1.25
        95
      • WR450F
        165
        45
        NFNT
        4
        50
      • Pro Circuit
        165
        40
        NCVQ
        3
        1.75
        50
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        2
        2
      • Pro Circuit
        125
        48
        NAAH
        2
        2
      • RM125
        370
        42.5
        6CHY17-6
        3
        2
      • Pro Circuit
        370
        40
        6CHY17-6
        2
        1.75
      • RM250
        168
        48
        NECJ
        3
        1
        45
        7.0
      • Pro Circuit
        168
        48
        NECJ
        3
        1.5
        48
        7.0
      • RM-Z250
        178
        40
        OBEKS
        4
        60
      • Pro Circuit
        165
        42
        OBEKR
        4
        2
        60
        Needle # K1618-70069
      • RM-Z450
        165
        42
        NCYR
        4
        1.25
        35
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX/RM65
        190
        25
        5GSP68
        3
        1.5
        1.5
        O-0
      • Pro Circuit
        200
        27.5
        5GSP68
        2
        1.5
        1.5
        O-0
      • KX85
        140
        45
        NAPE
        3
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPE
        2
        1.375
        3.5
      • KX/RM100
        138
        45
        NAPF
        4
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPF
        2
        1.375
        3.5
      • KX125
        420
        40
        6CHJ10-82
        3
        2.5
        5.75
      • Pro Circuit
        400
        35
        6CHJ10-82
        2
        1.5
      • KX250
        162
        50
        NFTG
        3
        1.75
        50
        8.0
      • Pro Circuit
        162
        48
        NFTG
        4
        1.5
        50
      • KX250F
        178
        40
        OBEKS
        4
        60
      • Pro Circuit
        165
        42
        OBEKR
        4
        2
        60
        Needle #16187-0069