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
      • CR85R
        3
      • Pro Circuit
        122
        52
        STK
        2
        1.5
      • CR125R
        4.5
      • Pro Circuit
        390
        40
        6DGY26-69
        3
        2
        4.5
      • CR250R
        420
        32.5
        6CHY12-82
        2
        1.5
      • Pro Circuit
        400
        32.5
        6CHY12-82
        2
        1.25
      • CRF250R
        160
        40
        NCYR
        4
        2
        68
      • Pro Circuit
        162
        42
        NCYR
        3
        2
        55
      • CRF250X
        4
      • Pro Circuit
        158
        42
        NCYS
        4
        2.25
        55
      • CRF450R
        165
        42
        NCYR
        4
        1.5
      • Pro Circuit
        168
        42
        NCYR
        4
        1.75
      • 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
        6CHY6-81
        3
        1.75
      • Pro Circuit
        410
        37.5
        6CHY6-81
        2
      • YZ250
        178
        50
        N3EJ
        2
        1
        50
        7.0
      • Pro Circuit
        175
        48
        N3EJ
        2
        1
        50
        7.0
      • YZ250F
        180
        42
        OBEKR
        4
        1.625
      • Pro Circuit
        182
        45
        OBEKR
        4
        1.75
      • YZ450F
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        2
        2
      • Pro Circuit
        122
        48
        NAAH
        2
        2
      • RM125
      • Pro Circuit
        360
        35
        2
        1.5
      • RM250
        168
        48
        NECJ
        3
        1.5
        45
        7.0
      • Pro Circuit
        165
        45
        NECJ
        2
        1.5
        45
        7.0
      • RM-Z250
        178
        40
        OBEKS
        4
        60
      • Pro Circuit
        165
        42
        OBEKR
        4
        2
        60
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX/RM60
        200
        30
        5114
        3
      • Pro Circuit
        200
        30
        5114
        2
      • 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
        165
        52
        NALF
        2
        1.5
        50
        8.0
      • Pro Circuit
        162
        50
        NAFG
        2
        1.5
        50
        8.0
      • KX250F
        178
        40
        OBEKS
        4
        60
      • Pro Circuit
        165
        42
        OBEKR
        4
        2
        60
      • KX500
        168
        58
        N82M
        3
        7.0
      • Pro Circuit
        168
        55
        N82M
        2
        7.0
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 125
      • Pro Circuit
      • KTM 200
      • Pro Circuit
      • KTM 250
      • Pro Circuit
      • KTM 300
      • Pro Circuit
      • KTM 380
      • Pro Circuit
      • KTM 450
      • Pro Circuit
      • KTM 525
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR85R
      • Pro Circuit
        122
        52
      • CR125R
        410
        40
        6DGY22-71
        2nd
        125
      • Pro Circuit
        390
        37.5
        6DGY22-71
        2nd
        2
      • CR250R
        420
        30
        6BHY38-73
        2nd
        1.5
        4.0
        S-9
      • Pro Circuit
        390
        32.5
        6BEY30-74
        3rd
        2
        4.0
        S-8
      • CRF450R
        170
        42
        OBELR
        5th
        1.5
      • Pro Circuit
        172
        42
        OBELR
        5th
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ85
        138
        45
        NBKF
        2nd
        2.375
      • Pro Circuit
        135
        42
        NBKF
        2nd
        2
      • YZ125
        410
        40
        6CHY6-32
        3rd
        2
        4.0
      • Pro Circuit
        430
        37.5
        6CHY6-32
        2nd
        1.5
        4.0
      • YZ250
        178
        50
        N3EJ
        2nd
        1
        50
        7.0
      • Pro Circuit
        175
        48
        N3EJ
        2nd
        1
        50
        7.0
      • YZ250F
        178
        40
        OBELP
        4th
        1.75
      • Pro Circuit
        178
        38
        STD
        4th
        1.25
      • YZ450F
        162
        42
        NCVQ
        4th
        2
      • Pro Circuit
        162
        40
        STD
        4th
        1.75
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM60
        200
        30
        5114
        3rd
      • Pro Circuit
        200
        30
        5114
        2nd
      • RM65
        190
        25
        5GSP68
        3rd
        1.5
        1.5
        O-0
      • Pro Circuit
        200
        27.5
        5GSP68
        2nd
        1.5
        1.5
        O-0
      • RM85
        125
        50
        NAAH
        3rd
        2
      • Pro Circuit
        122
        48
        NAAH
        2nd
        2
      • RM100
        138
        45
        NAPF
        4th
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPF
        2nd
        1.375
        3.5
      • RM125
        460
        40
        6BGY27-77
        3rd
        1.5
        5.0
      • Pro Circuit
        440
        37.5
        6BGY27-77
        2nd
        1.5
        5.0
      • RM250
        175
        48
        N8RH
        3rd
        1.5
        50
        6.5
      • Pro Circuit
        165
        45
        N8RH
        2nd
        1.5
        48
        7.0
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
        200
        30
        5114
        3rd
      • Pro Circuit
        200
        30
        5114
        2nd
      • KX65
        190
        25
        5GSP68
        3rd
        1.5
        1.5
        O-0
      • Pro Circuit
        200
        27.5
        5GSP68
        2nd
        1.5
        1.5
        O-0
      • KX85
        140
        45
        NAPE
        3rd
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPE
        2nd
        1.375
        3.5
      • KX100
        138
        45
        NAPF
        4th
        1.375
        3.5
      • Pro Circuit
        138
        42
        NAPF
        2nd
        1.375
        3.5
      • KX125
        420
        40
        6CHJ11-82
        3rd
        2.5
        5.75
      • Pro Circuit
        400
        37.5
        6CHJ11-82
        3rd
        1.75
        5.75
      • KDX200
      • Pro Circuit
      • KDX220
      • Pro Circuit
      • KX250
        165
        52
        NAFH
        2nd
        2
        50
        8.0
      • Pro Circuit
        162
        50
        NAFG
        2nd
        1.5
        50
        8.0
      • KX500
        168
        58
        N82M
        3rd
        7.0
      • Pro Circuit
        168
        55
        N82M
        2nd
        7.0
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 125
      • Pro Circuit
        192
        45
        1469H
        3rd
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R
        122
        55
        A2410A
        3rd
        1.75
      • Pro Circuit
        STD
        STD
        STD
        2nd
        1.5
      • CR125R
        400
        32.5
        6DFY-74
        3rd
        2.125
      • Pro Circuit
        390
        STD
        STD
        3rd
        2
      • CR250R
        380
        32.5
        6BEY30-74
        2nd
        1.5
        S-9
      • Pro Circuit
        380
        32.5
        6BEY30-74
        3rd
        1.5
        S-8
        3TC-14141-S8
      • CRF450R
        175
        45
        OBEKR
        4th
        1.5
      • Pro Circuit
        STD
        STD
        STD
        STD
        STD
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ85
        138
        45
        NBKF
        2nd
        2.375
        3
      • Pro Circuit
        135
        42
        STD
        2nd
        2
      • YZ125
        420
        30
        6CHY5-79
        3rd
        2.5
        5.75
      • Pro Circuit
        390
        27.5
        6BGK9-76
        3rd
        2
        STD
      • YZ250
        178
        50
        N3EJ
        2nd
        1
        50
        7.0
      • Pro Circuit
        175
        50
        STD
        2nd
        1.5
        50
        STD
      • YZ250F
      • Pro Circuit
      • YZ426F
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM85
        125
        50
        NAAH
        3rd
        2
      • Pro Circuit
        122
        48
        STD
        2nd
        2
      • RM125
        460
        32.5
        6BGY27-77
        3rd
        1.5
        5.0
      • Pro Circuit
        440
        STD
        STD
        STD
        1.75
        5.5
      • RM250
        165
        55
        N8RH
        3rd
        1.5
        45
        7.0
      • Pro Circuit
        162
        48
        STD
        2nd
        2
        STD
        STD
        Choke 12 Clicks Out
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
        200
        30
        5114
        3rd
        2.0
        N-8
      • Pro Circuit
        STD
        STD
        STD
        2nd
        STD
        STD
      • KX65
        190
        25
        5GSP68
        3rd
        1.5
        1.5
      • Pro Circuit
        200
        STD
        STD
        2nd
        STD
        STD
      • KX85
        140
        45
        NAPE
        3rd
        1.375
        3.5
      • Pro Circuit
        138
        42
        STD
        2nd
        1.25
        STD
      • KX100
        138
        45
        NAPF
        4th
        1.375
        3.5
      • Pro Circuit
        STD
        42
        STD
        2nd
        1.25
        STD
      • KX125
        350
        45
        6BEF16-69
        3rd
        2
        5.5
        S-4
      • Pro Circuit
        340
        40
        6BEF16-70
        3rd
        1.75
        STD
        STD
      • KDX200
      • Pro Circuit
      • KDX220
        145
        42
        R1173L
        3rd
        1.75
      • Pro Circuit
        STD
        50
        STD
        2nd
        1.5
      • KX250
        165
        55
        NAFF
        2nd
        1.25
        48
        8.0
      • Pro Circuit
        160
        STD
        STD
        STD
        1.5
        STD
        STD
      • KX500
        168
        58
        N82M
        3rd
        7.0
      • Pro Circuit
        STD
        55
        STD
        2nd
        1.75
        STD
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM 125
      • Pro Circuit
        192
        45
        1469H
        3rd
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R
        122
        55
        A2410A
        3rd
        1.75
      • Pro Circuit
        STD
        STD
        STD
        2nd
        1.5
      • CR125R
        380
        45
        6BEG20-68
        3rd
        5
      • Pro Circuit
        370
        37.5
        6BEG20-69
        2nd
        1.5
        STD
      • CR250R
        420
        35
        6BEH1-73
        3rd
        1.75
        4
        S7 Needle Jet
      • Pro Circuit
        STD
        30
        STD
        3rd
        1.5
        STD
        3TC141-57
      • CR500R
        170
        55
        1368
        3rd
        1.5
      • Pro Circuit
        STD
        STD
        STD
        2nd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
        290
        32.5
        5H22
        3rd
        1.5
      • Pro Circuit
        280
        35
        STD
        2nd
        1.5
      • YZ125
        460
        25
        6BGK9-75
        3rd
        1.25
        5.75
      • Pro Circuit
        410
        30
        STD
        2nd
        1.75
        STD
      • YZ250
        178
        50
        N1EK
        3rd
        1
        50
        7
      • Pro Circuit
        175
        45
        STD
        2nd
        1
        48
        STD
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM80
        210
        35
        5DP39
        4th
        1.5
      • Pro Circuit
        190
        30
        STD
        2nd
        1.5
      • RM125
        460
        27.5
        3rd
        1.5
        5.75
      • Pro Circuit
        430
        STD
        2nd
        1.5
        STD
      • RM250
        162
        48
        N3WK
        3rd
        1.5
        45
        7
      • Pro Circuit
        160
        2nd
        STD
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
        200
        30
        5I14
        3rd
        2
        N-8
      • Pro Circuit
        STD
        STD
        STD
        2nd
        STD
        STD
      • KX65
        230
        40
        5H559
        3rd
        1.5
        2nd
        0-0 Needle Jet
      • Pro Circuit
        220
        4th
      • KX85
        140
        45
        NAPE
        3rd
        1.375
        3.5
      • Pro Circuit
        138
        42
        STD
        2nd
        1.25
      • KX100
        138
        45
        NAPF
        4th
        1.375
        3.5
      • Pro Circuit
      • KX125
        360
        50
        6BEF16-69
        4th
        2
        5.5
        S-4 Needle Jet
      • Pro Circuit
        370
        45
        STD
        2nd
        2
        STD
      • KDX200
      • Pro Circuit
      • KDX220
      • Pro Circuit
      • KX250
        160
        52
        NAFF
        3rd
        48
        8
      • Pro Circuit
        158
        STD
        STD
        2nd
        1.75
        STD
        STD
      • KX500
        168
        58
        N82M
        3rd
        7
      • Pro Circuit
        STD
        55
        STD
        2nd
        1.75
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R
        122
        55
        A2410A
        3rd
        1.75
      • Pro Circuit
        STD
        STD
        STD
        2nd
        1.5
      • CR125R
        360
        50
        20-69
        3rd
        4.5
        36 TMX Mikuni
      • Pro Circuit
        340
        40
        20-69
        2nd
        (Jet Needle) 63-TO
      • CR250R
        180
        48
      • Pro Circuit
        172
        STD
        STD
        2nd
        1.5
      • CR500R
        170
        55
        1368
        3rd
        1.5
      • Pro Circuit
        STD
        STD
        STD
        2nd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
        290
        32.5
        5H22
        3rd
        1.5
      • Pro Circuit
        280
        35
        STD
        2nd
        1.5
      • YZ125
        350
        35
        53-75
        3rd
        1.75
        6.5
        36 TMX Mikuni
      • Pro Circuit
        340
        STD
        STD
        2nd
        1.75
        STD
      • YZ250
        175
        50
        N3CW
        3rd
        1
        55
        7
      • Pro Circuit
        172
        48
        STD
        2nd
        1
        STD
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM80
        210
        35
        5DP39
        4th
        1.5
      • Pro Circuit
        190
        30
        STD
        2nd
        1.5
      • RM125
        178
        50
        R1469L
        3rd
        1.75
        55
        6
        38 PWX Kehin
      • Pro Circuit
        168
        STD
        STD
        2nd
        1.5
        STD
        STD
      • RM250
        158
        42
        N3WK
        3rd
        1.5
        55
        6
        38 PWX Kehin
      • Pro Circuit
        155
        STD
        STD
        STD
        1.5
        Choke 3 Turns Out
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
        200
        30
        5114
        3rd
      • Pro Circuit
        STD
        STD
        STD
        2nd
      • KX65
        200
        40
        5H45
        2nd
        1
      • Pro Circuit
      • KM80
        125
        58
        N5HF
        3rd
        1.5
        STD 26 Carb
      • Pro Circuit
        122
        STD
        STD
        2nd
        1.5
      • KX100
        125
        55
        N5HF
        3rd
        1.5
      • Pro Circuit
        122
        STD
        STD
        3rd
        1.5
      • KX125
        160
        45
        N7PW
        3rd
        1.5
        55
        6
      • Pro Circuit
        158
        40
        STD
        2nd
        1.5
        48
        STD
      • KDX200
      • Pro Circuit
      • KDX220
      • Pro Circuit
      • KX250
        160
        52
        N3WF
        3rd
        1.5
        48
        8
      • Pro Circuit
        158
        STD
        STD
        2nd
        1.5
        STD
        STD