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
      • YZ65
        142
        3
      • PC MRX02
        140-142
        48
        NAPF
        2
        2
      • YZ85
        138
        45
        NBKF
        2
        2.375
      • PC MRX02
        145
        45
        NAPG
        3
        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
      • Mammoth
        140
        45
        NAPD
        2
      • 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
      • KX112 PC
      • Mammoth
        140
        45
        NAQC
        3
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 50 SX
      • Pro Circuit
      • KTM 65 SX
        210
        15
        Stock
        Top
        3.5
      • Pro Circuit
      • KTM 85 SX
      • PC MRX02
        142
        45
        NRKC
        3
        1.5-2
      • KTM112 PC
      • MRX02
      • KTM 125 SX
        500
        35
        2
        1.5
      • PC MRX02
        510
        37.5
        2
        2
      • PC VP C12
        490
        32
        2
        1.5
      • KTM 150 SX
        470
        35
        42-74
        3
        2
      • PC MRX02
        480
        37.5
        42-74
        3
        2
      • PC VP C12
        460
        32.5
        42-74
        3
        2
      • KTM 250 SX
        450
        35
        3
      • PC MRX02
        455
        37.5
        3
        1.5-2
      • PC VP C12
        445
        32
        3
        1.5-2
      • KTM 300 XC
      • Pro Circuit
      • 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
      • TC 65
      • PC MRX02
        210
        20
        5IPL43
        2
        3.5
      • 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
      • YZ65
        142
        3
      • PC MRX02
        140-142
        48
        NAPF
        2
        2
      • 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
      • Mammoth
        140
        45
        NAPD
        2
      • 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
      • KX112 PC
      • Mammoth
        140
        45
        NAQC
        3
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 50 SX
      • Pro Circuit
      • KTM 65 SX
        210
        15
        Stock
        Top
        3.5
      • Pro Circuit
      • KTM 85 SX
      • PC MRX02
        142
        45
        NRKC
        3
        1.5-2
      • KTM112 PC
      • MRX02
      • KTM 125 SX
        480
        35
        42-75
        3
        2
      • PC MRX02
        490-500
        35
        42-75
        3
        2.5
      • PC VP C12
        470
        35
        42-75
        3
        2
      • KTM 150 SX
        470
        35
        42-74
        3
        2
      • PC MRX02
        480
        37.5
        42-74
        3
        2
      • PC VP C12
        460
        32.5
        42-74
        3
        2
      • KTM 250 SX
        440
        42.5
        43-73
        3
        1.5
      • PC MRX02
        440
        42.5
        43-73
        3
        1.5
      • PC VP C12
        430
        42.5
        43-73
        3
        1.5
      • KTM 300 XC
      • Pro Circuit
      • 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
      • TC 65
      • PC MRX02
        210
        20
        5IPL43
        2
        3.5
      • 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
      • Mammoth
        140
        45
        NAPD
        2
      • VP C12
        140
        42
        NAPE(D)
        3rd/2nd
        1.5
        3.5
      • VP110
        142
        45
        NAPE(D)
        3rd/2nd
        1.5
        3.5
      • MRX02
        142/45
        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
      • KX112 PC
      • Mammoth
        140
        45
        NAQC
        3
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 50 SX
      • Pro Circuit
      • KTM 65 SX
        210
        15
        Stock
        Top
        3.5
      • Pro Circuit
      • KTM 85 SX
      • Pro Circuit
      • KTM112 PC
      • MRX02
      • KTM 125 SX
        480
        35
        42-75
        3
        2
      • PC MRX02
        490-500
        35
        42-75
        3
        2.5
      • PC VP C12
        470
        35
        42-75
        3
        2
      • KTM 150 SX
        470
        35
        42-74
        3
        2
      • PC MRX02
        480
        37.5
        42-74
        3
        2
      • PC VP C12
        460
        32.5
        42-74
        3
        2
      • KTM 250 SX
        440
        42.5
        43-73
        3
        1.5
      • PC MRX02
        440
        42.5
        43-73
        3
        1.5
      • PC VP C12
        430
        42.5
        43-73
        3
        1.5
      • KTM 300 XC
      • Pro Circuit
      • 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
      • TC 65
      • Pro Circuit
        210
        20
        5IPL43
        3.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CRF150R
        138
        30
        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
      • Mammoth
        140
        45
        NAPD
        2
      • 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
      • KX112 PC
      • Mammoth
        140
        45
        NAQC
        3
      • 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
        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