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
      • 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
        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
      • PC YZ112
        135
        42
        NBKF
        2
        2
      • YZ125
        430
        40
        6BFY43-74
        4
        2.25
      • Pro Circuit
        420
        38
        6BFY43-74
        3
        1.75
      • TTR125
        105
        15
      • Pro Circuit
        107.5
        15
        Stock
        3
        1.75
      • YZ250
        178
        50
        N3EW
        2
        1
        50
      • Pro Circuit
        175
        48
        N3EW
        2
        1
        50
        7.0
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        2
        2
      • Pro Circuit
        125
        48
        NAAH
        2
        2
      • PC RM112
        125
        48
        NAAH
        2
        2
      • 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
      • MRX02
        210
        30
        5GSP68
        3
        1.5
        1.5
        O-0
      • KX85
        140
        38
        NRJC
        1.5
        3.5
      • KX85 PC
      • VP C12
        140
        42
        NAPE(D)
        3rd/2nd
        1.5
        3.5
      • VP110
        142
        45
        NAPE(D)
        3rd/2nd
        1.5
        3.5
      • MRX02
        142/145
        45
        NAPD
        3rd
        1.5
        3.5
      • KX100
        140
        38
        NRKC
        1.5
        3.5
      • KX109 PC
      • VP C12
        142
        45
        NAQC
        3rd
        1.5
        3.5
      • VP110
        145
        48
        NAQC
        3rd
        1.5
        3.5
      • MRX02
        145/148
        45/48
        NAQC
        3rd
        1.5
        3.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 50 SX
        85
        58
        260AU
        3
        3
      • Pro Circuit
        85
        58
        260AU
        3
        3
      • KTM 65 SX
        210
        20
        5IPL43
        2
        3.5
      • Pro Circuit
        195
        18
        5IPL43
        1
        2
      • KTM 85 SX
        118
        45
        N5HG
        3
        1.5
      • Pro Circuit
        115
        42
        N5HH
        2
        1.75
      • KTM112 PC
        118
        42
        N5HH
        2
        1.75
      • MRX02
        120
        45
        N5HH
        3
        1.5
      • KTM 125 SX
        182
        42
        NOZI
        3
        1.5
      • Pro Circuit
        182
        42
        NOZI
        3
        1.5
      • KTM 150 SX
        182
        40
        NOZI
        2
        2
      • Pro Circuit
        182
        40
        NOZI
        2
        2
      • KTM 250 SX
        158
        42
        N1EI
        3
        2
      • Pro Circuit
        158
        40
        N1EI
        3
        2
      • KTM 300 XC
        165
        35
        N2ZK
        4
        2
      • Pro Circuit
        165
        35
        N2ZK
        3
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CX 50 JR
      • Pro Circuit
      • CX 50 SR
        95
        60
        W7
      • Pro Circuit
        93
        55
        W7
      • CX 65
        280
        42.5
        RI14
        4
      • Pro Circuit
        270
        42.5
        RI14
        3
      • 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
      • 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
        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
      • PC YZ112
        135
        42
        NBKF
        2
        2
      • YZ125
        430
        40
        6BFY43-74
        4
        2.25
      • Pro Circuit
        420
        38
        6BFY43-74
        3
        1.75
      • TTR125
        105
        15
      • Pro Circuit
        107.5
        15
        Stock
        3
        1.75
      • YZ250
        178
        50
        N3EW
        2
        1
        50
      • Pro Circuit
        175
        48
        N3EW
        2
        1
        50
        7.0
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        2
        2
      • Pro Circuit
        125
        48
        NAAH
        2
        2
      • PC RM112
        125
        48
        NAAH
        2
        2
      • 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
      • MRX02
        210
        30
        5GSP68
        3
        1.5
        1.5
        O-0
      • KX85
        140
        38
        NRJC
        1.5
        3.5
      • KX85 PC
      • VP C12
        140
        42
        NAPE(D)
        3rd/2nd
        1.5
        3.5
      • VP110
        142
        45
        NAPE(D)
        3rd/2nd
        1.5
        3.5
      • MRX02
        142/145
        45
        NAPD
        3rd
        1.5
        3.5
      • KX100
        140
        38
        NRKC
        1.5
        3.5
      • KX109 PC
      • VP C12
        142
        45
        NAQC
        3rd
        1.5
        3.5
      • VP110
        145
        48
        NAQC
        3rd
        1.5
        3.5
      • MRX02
        145/148
        45/48
        NAQC
        3rd
        1.5
        3.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 50 SX
        85
        58
        260AU
        3
        3
      • Pro Circuit
        85
        58
        260AU
        3
        3
      • KTM 65 SX
        210
        20
        5IPL43
        2
        3.5
      • Pro Circuit
        195
        40
        5IPL43
        1
        2
      • KTM 85 SX
        118
        45
        N5HG
        3
        1.5
      • Pro Circuit
        115
        42
        N5HH
        2
        1.75
      • KTM112 PC
        118
        42
        N5HH
        2
        1.75
      • MRX02
        120
        45
        N5HH
        3
        1.5
      • KTM 125 SX
        182
        42
        NOZI
        3
        1.5
      • Pro Circuit
        182
        42
        NOZI
        3
        1.5
      • KTM 150 SX
        182
        40
        NOZI
        2
        2
      • Pro Circuit
        182
        40
        NOZI
        2
        2
      • KTM 250 SX
        158
        42
        N1EI
        3
        2
      • Pro Circuit
        158
        40
        N1EI
        3
        2
      • KTM 300 XC
        165
        35
        N2ZK
        4
        2
      • Pro Circuit
        165
        35
        N2ZK
        3
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CX 50 JR
      • Pro Circuit
      • CX 50 SR
        95
        60
        W7
      • Pro Circuit
        93
        55
        W7
      • CX 65
        280
        42.5
        RI14
        4
      • Pro Circuit
        270
        42.5
        RI14
        3
      • 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
      • 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
        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
      • PC YZ112
        135
        42
        NBKF
        2
        2
      • YZ125
        430
        40
        6BFY43-74
        4
        2.25
      • Pro Circuit
        420
        38
        6BFY43-74
        3
        1.75
      • TTR125
        105
        15
      • Pro Circuit
        107.5
        15
        Stock
        3
        1.75
      • YZ250
        178
        50
        N3EW
        2
        1
        50
      • Pro Circuit
        175
        48
        N3EW
        2
        1
        50
        7.0
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        2
        2
      • Pro Circuit
        125
        48
        NAAH
        2
        2
      • PC RM112
        125
        48
        NAAH
        2
        2
      • 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
      • MRX02
        210
        30
        5GSP68
        3
        1.5
        1.5
        O-0
      • KX85
        140
        38
        NRJC
        1.5
        3.5
      • KX85 PC
      • VP C12
        140
        42
        NAPE(D)
        3rd/2nd
        1.5
        3.5
      • VP110
        142
        45
        NAPE(D)
        3rd/2nd
        1.5
        3.5
      • MRX02
        142/145
        45
        NAPD
        3rd
        1.5
        3.5
      • KX100
        140
        38
        NRKC
        1.5
        3.5
      • KX109 PC
      • VP C12
        142
        45
        NAQC
        3rd
        1.5
        3.5
      • VP110
        145
        48
        NAQC
        3rd
        1.5
        3.5
      • MRX02
        145/148
        45/48
        NAQC
        3rd
        1.5
        3.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 50 SX
        85
        58
        260AU
        3
        3
      • Pro Circuit
        85
        58
        260AU
        3
        3
      • KTM 65 SX
        210
        20
        5IPL43
        2
        3.5
      • Pro Circuit
        195
        40
        5IPL43
        1
        2
      • KTM 85 SX
        118
        45
        N5HG
        3
        1.5
      • Pro Circuit
        115
        42
        N5HH
        2
        1.75
      • KTM112 PC
        118
        42
        N5HH
        2
        1.75
      • MRX02
        120
        45
        N5HH
        3
        1.5
      • KTM 125 SX
        182
        42
        NOZI
        3
        1.5
      • Pro Circuit
        182
        42
        NOZI
        3
        1.5
      • KTM 150 SX
        182
        40
        NOZI
        2
        2
      • Pro Circuit
        182
        40
        NOZI
        2
        2
      • KTM 250 SX
        158
        42
        N1EI
        3
        2
      • Pro Circuit
        158
        40
        N1EI
        3
        2
      • KTM 300 XC
        165
        35
        N2ZK
        4
        2
      • Pro Circuit
        165
        35
        N2ZK
        3
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CX 50 JR
      • Pro Circuit
      • CX 50 SR
        95
        60
        W7
      • Pro Circuit
        93
        55
        W7
      • CX 65
        280
        42.5
        RI14
        4
      • Pro Circuit
        270
        42.5
        RI14
        3
      • 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
      • 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
        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
      • PC YZ112
        135
        42
        NBKF
        2
        2
      • YZ125
        430
        40
        6BFY43-74
        4
        2.25
      • Pro Circuit
        420
        38
        6BFY43-74
        3
        1.75
      • TTR125
        105
        15
      • Pro Circuit
        107.5
        15
        Stock
        3
        1.75
      • YZ250
        178
        50
        N3EW
        2
        1
        50
      • Pro Circuit
        175
        48
        N3EW
        2
        1
        50
        7.0
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        2
        2
      • Pro Circuit
        125
        48
        NAAH
        2
        2
      • PC RM112
        125
        48
        NAAH
        2
        2
      • 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
      • MRX02
        210
        30
        5GSP68
        3
        1.5
        1.5
        O-0
      • KX85
        140
        38
        NRJC
        1.5
        3.5
      • KX85 PC
      • VP C12
        140
        42
        NAPE(D)
        3rd/2nd
        1.5
        3.5
      • VP110
        142
        45
        NAPE(D)
        3rd/2nd
        1.5
        3.5
      • MRX02
        142/145
        45
        NAPD
        3rd
        1.5
        3.5
      • KX100
        140
        38
        NRKC
        1.5
        3.5
      • KX109 PC
      • VP C12
        142
        45
        NAQC
        3rd
        1.5
        3.5
      • VP110
        145
        48
        NAQC
        3rd
        1.5
        3.5
      • MRX02
        145/148
        45/48
        NAQC
        3rd
        1.5
        3.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 50 SX
        85
        58
        260AU
        3
        3
      • Pro Circuit
        85
        58
        260AU
        3
        3
      • KTM 65 SX
        210
        20
        5IPL43
        2
        3.5
      • Pro Circuit
        195
        40
        5IPL43
        1
        2
      • KTM 85 SX
        118
        45
        N5HG
        3
        1.5
      • Pro Circuit
        115
        42
        N5HH
        2
        1.75
      • KTM112 PC
        118
        42
        N5HH
        2
        1.75
      • MRX02
        120
        45
        N5HH
        3
        1.5
      • KTM 125 SX
        182
        42
        NOZI
        3
        1.5
      • Pro Circuit
        182
        42
        NOZI
        3
        1.5
      • KTM 150 SX
        182
        40
        NOZI
        2
        2
      • Pro Circuit
        182
        40
        NOZI
        2
        2
      • KTM 250 SX
        158
        42
        N1EI
        3
        2
      • Pro Circuit
        158
        40
        N1EI
        3
        2
      • KTM 300 XC
        165
        35
        N2ZK
        4
        2
      • Pro Circuit
        165
        35
        N2ZK
        3
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CX 50 JR
      • Pro Circuit
      • CX 50 SR
        95
        60
        W7
      • Pro Circuit
        93
        55
        W7
      • CX 65
        280
        42.5
        RI14
        4
      • Pro Circuit
        270
        42.5
        RI14
        3
      • 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
      • Fuel Injection
      • 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
      • Pro Circuit
        410
        35
        6CHY5-80
        3
        1.75
      • YZ250
        178
        50
        N3EW
        2
        1
        50
      • Pro Circuit
        175
        48
        N3EW
        2
        1
        50
        7.0
      • YZ250F
      • Pro Circuit
        172
        45
        NKYV
        3
        2
        PC Slide Modified
        65
        *Stock Slide gets mod for $60.00
      • YZ450F
      • Fuel Injection
      • WR250F
      • 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
      • Fuel Injection
      • 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
        No
      • Pro Circuit
        178
        40
        OBETP
        4
        2
        1.5
        Leak
        wire acc pump