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
      • CR80R
        125
        52
        1343
        2nd
        1.5
      • Pro Circuit
        1343
        2nd
        1.5
      • CR125R
        172
        58
        1470
        3rd
        1.5
      • Pro Circuit
        165
        55
        1468
        2nd
        1.5
      • CR250R
        175
        55
        1368
        Middle
        1.5
      • Pro Circuit
        172
        52
        1369
        2nd
        1.5
        Close Idle
      • CR500
        170
        55
        1368
        3rd
        1.5
      • Pro Circuit
        170
        55
        1368
        3rd
        1.5
        Close Idle
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
        270
        35
        5H22
        3rd
        1.5
      • Pro Circuit
        270
        35
        5H22
        3rd
        1.5
      • YZ125
        330
        15
        6EJ35-59
        2nd
        1.5
      • Pro Circuit
        330
        15
        6EJ35-59
        2nd
        1.5
      • YZ250
        350
        40
        6EJ33-61
        4th
        1.75
      • Pro Circuit
        370
        45
        6EJ33-61
        2nd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM80
        210
        30
        5DP39
        4th
        1.5
      • Pro Circuit
        200
        35
        5DP39
        2nd
        1.5
      • RM125
        168
        50
        20714
        2nd
        1.5
        Double Up Reeds (15mm Long)
      • Pro Circuit
        172
        52
        1469
        3rd
        1.25
        Use The Metal Stops
      • RM250
        180
        52
        1469MS
        3rd
        1.5
      • Pro Circuit
        168
        52
        1469MS
        2nd
        1.5
        Close Idle & Back Out (10) Clicks
      • RMX250
        150
        60
        1472
        3rd
        1.5
      • Pro Circuit
        178
        52
        1468
        3rd
        1.5
      • ****For all 80's & 125's use plug with heat range of 8 NGK-B8EV
      • ****Forall 250's & 500's use plug with heat range of 9 NGK-B9EV
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX80
        122
        55
        N68U
        3rd
        1.5
      • Pro Circuit
        122
        55
        N68U
        2nd
        1.5
      • KX125
        165
        58
        N1KM
        1.75
        Use Thick Reeds
      • Pro Circuit
        160
        52
        NIAL
        2nd
        1
        Part#12022-1074
      • KX250
        165
        45
        N1EE
        3rd
        1.5
      • Pro Circuit
        158
        45
        NOZ6
        3rd
        1.5
        Thin Head Gasket
      • KX500
        168
        60
        N82M
        3rd
        1.5
      • Pro Circuit
        168
        58
        N82M
        2nd
        2
      • KDX200
        150
        48
        R1172N
        3rd
        1.5
        Use KX500 T/A Filter
      • Pro Circuit
        155
        48
        R1172N
        4th
        1.5
        Take Air Box Top Off
      • KDX250
        165
        42
        1368
        1.5
      • Pro Circuit
        158
        42
        1368
        2nd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R
      • Pro Circuit
        128
        52
        2nd
        1.5
      • CR125R
      • Pro Circuit
        165
        55
        1468
        2nd
        1.5
        Close Idle
      • CR250R
      • Pro Circuit
        172
        55
        1369
        2nd
        1.5
        Close Idle
      • CR500R
      • Pro Circuit
        170
        55
        STD
        2nd
        1.5
        Close Idle
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
      • Pro Circuit
        270
        35
        STD
        3rd
        1.75
      • YZ125
      • Pro Circuit
        310
        15-17.5
        STD
        2
        1.5
      • YZ250
      • Pro Circuit
        350
        50
        61
        3rd
        1.75
      • WR500
      • Pro Circuit
        440-450
        45
        STD
        2nd
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM80
      • Pro Circuit
        190-200
        35
        STD
        2nd
        1.5
      • RM125
      • Pro Circuit
        340
        STD
        STD
        1st
        1.5
      • RM250
      • Pro Circuit
        178
        52
        1471
        2nd
        1.5
      • RMX250
      • Pro Circuit
        178
        50
        1468
        4th
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
      • Pro Circuit
        200
        30
        STD
        3rd
        1
      • KX80
      • Pro Circuit
        122
        55
        STD
        3rd
        1.5
      • KX125
      • Pro Circuit
        168
        52
        1469
        3rd
        1.5
        6
      • KDX200
      • Pro Circuit
        155
        48
        STD
        2nd
        1.5
        Use KX500 T/A Filter & Remove Top Air Box Cover
      • KDX250
      • Pro Circuit
        165
        40
        1369
        3rd
        2
      • KX250
      • Pro Circuit
        162
        50
        STD
        3rd
        1.5
        7
      • KX500
      • Pro Circuit
        STD
        58
        N82R
        2nd
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R
      • Pro Circuit
        128
        52
        STD
        2nd
        1.5
      • CR125R
      • Pro Circuit
        165
        55
        1468
        2nd
        1.5
        Close Idle
      • CR250R
      • Pro Circuit
        172
        STD
        1369
        2nd
        1.5
        Close Idle
      • CR500R
      • Pro Circuit
        170
        STD
        STD
        2nd
        1.5
        Close Idle
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
      • Pro Circuit
        280
        35
        STD
        2nd
        1.5
      • YZ125
      • Pro Circuit
        310
        22.5
        STD
        2nd
        1.5
      • YZ250
      • Pro Circuit
        STD
        STD
        STD
        2nd
        1.5
      • WR500
      • Pro Circuit
        440-450
        45
        STD
        2nd
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM80
      • Pro Circuit
        190-200
        35
        STD
        2nd
        1.5
      • RM125
      • Pro Circuit
        STD
        STD
        STD
        2nd
        1.5
      • RM250
      • Pro Circuit
        360
        45
        63
        2nd
        1.5
      • RMX250
      • Pro Circuit
        350
        45
        63
        2nd
        1.5
        Take Power Valve Stops Out
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
      • Pro Circuit
        200
        30
        STD
        2nd
        1.5
      • KX80
      • Pro Circuit
        122
        55
        STD
        2nd
        1.5
      • KX125
      • Pro Circuit
        162
        STD
        STD
        2nd
        1.5
      • KDX200
      • Pro Circuit
        155
        48
        STD
        2nd
        1.5
        Use KX500 T/A Filter And Take Off Air Box Cover
      • KX250
      • Pro Circuit
        STD
        STD
        STD
        2nd
        1.5
      • KX500
      • Pro Circuit
        STD
        58
        N82R
        2nd
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R
      • Pro Circuit
        128
        52
        STD
        2nd
        1.5
      • CR125R
      • Pro Circuit
        165
        STD
        1468
        2nd
        1.5
        Close Idle
      • CR250R
      • Pro Circuit
        172
        STD
        STD
        2nd
        1.5
        Close Idle
      • CR500R
      • Pro Circuit
        168
        STD
        STD
        2nd
        1.5
        Close Idle
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
      • Pro Circuit
        280
        35
        STD
        2nd
        1.5
      • YZ125
      • Pro Circuit
        320
        22.5
        STD
        2nd
        1.5
      • YZ250
      • Pro Circuit
        STD
        STD
        STD
        2nd
        1.5
      • WR500
      • Pro Circuit
        440-450
        45
        STD
        2nd
        2
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM80
      • Pro Circuit
        190-200
        35
        STD
        2nd
        1.5
      • RM125
      • Pro Circuit
        STD
        STD
        STD
        2nd
        1.5
      • RM250
      • Pro Circuit
        360
        45
        STD
        2nd
        1.5
      • RMX250
      • Pro Circuit
        360
        45
        63
        2nd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
      • Pro Circuit
        200
        30
        STD
        2nd
        1.5
      • KX80
      • Pro Circuit
        122
        55
        STD
        2nd
        1.5
      • KX125
      • Pro Circuit
        158
        55
        STD
        2nd
        1.5
      • KDX200
      • Pro Circuit
        155
        48
        STD
        2nd
        1.5
        Use KX500 T/A Filter And Take Off Air Box Cover
      • KX250
      • Pro Circuit
        STD
        58
        STD
        2nd
        1.5
      • KX500
      • Pro Circuit
        168
        58
        N82R
        3rd
        1.5