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
        122
        55
        A2410A
        3rd
        1.75
      • Pro Circuit
        STK
        STK
        STK
        2nd
        1.5
      • CR125R
        172
        55
        1369L
        3rd
        1.5
      • Pro Circuit
        168
        50
        1369N
        3rd
        1.5
        Needle #16012-ML3-910
      • CR250R
        185
        42
        1370D
        2nd
        1.5
      • Pro Circuit
        168
        55
        1370M
        3rd
        1.5
        Needle #16204-K23-690
      • CR500R
        170
        55
        1368
        3rd
        1.5
      • Pro Circuit
        STD
        STD
        STD
        2nd
        STD
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
        290
        32.5
        5H22
        3rd
        1.5
      • Pro Circuit
        280
        35
        2nd
        STK
      • YZ125
        350
        50
        6DHY53-76
        3rd
        2
        6.5
      • Pro Circuit
        STD
        STD
        STD
        3rd
        1.25
        7
        5ET-14112-70
      • YZ250
        172
        50
        N3VF
        2nd
        1.75
        80
      • Pro Circuit
        168
        48
        STD
        2nd
        1.5
        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
        STD
      • RM125
        180
        55
        1469M
        4th
        1.5
        55
      • Pro Circuit
        165
        STD
        STD
        3rd
        1.5
        STD
      • RM250
        158
        45
        NIEG
        3rd
        1.5
        55
      • Pro Circuit
        155
        42
        STD
        2nd
        1.5
      • RMX250
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
        200
        30
        5I14
        3rd
      • Pro Circuit
        STD
        STD
        STD
        2nd
      • KX80
        125
        58
        N5HF
        3rd
        1.5
      • Pro Circuit
        122
        55
        STD
        3rd
        1.5
      • KX100
        125
        55
        N5HF
        3rd
        1.5
      • Pro Circuit
        122
        STD
        STD
        3rd
        1.5
      • KX125
        158
        45
        N7PW
        2nd
        2
        52
      • Pro Circuit
        STD
        50
        STD
        2nd
        2
        STD
      • KDX200
        160
        48
        R1174K
        3rd
        2
      • Pro Circuit
        STD
        2nd
        1.5
      • KX250
        158
        45
        N3YK
        3rd
        2
        55
      • Pro Circuit
        STD
        STD
        N3WK
        3rd
        1.25
        58
        16159-1056 (Power Jet)
        16187-1079 (Needle)
      • KX500
        168
        58
        N82N
        3rd
        1.75
      • Pro Circuit
        STD
        55
        STD
        2nd
        1.5
      • Off Road
        STD
        55
        N82Q
        3rd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KTM125
        190
        48
        NOZH
        3rd
        1.5
      • Pro Circuit
        STD
        STD
        2nd
        1.5
      • KTM200
        180
        45
        NOZH
        3rd
        1.5
      • Pro Circuit
      • KTM250
        172
        45
        NOZG
        2nd
        1.5
      • Pro Circuit
      • KTM380
        170
        48
        NOZG
        2nd
        1.5
      • Pro Circuit
        STD
        50
        1467
        3rd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R
        122
        55
        A2410A
        3rd
        1.75
      • Pro Circuit
        STK
        STK
        STK
        2nd
        1.5
      • CR125R
        172
        50
        1368
        3rd
        2
      • Pro Circuit
        165
        52
        R1469
        2nd
        1.5
      • CR250R
        175
        55
        1369
        3rd
        1.75
        42
      • Pro Circuit
        165
        STK
        1370
        2nd
        1.5
        STK
      • CR500R
        170
        55
        1368
        3rd
        1.5
      • Pro Circuit
        STK
        STK
        STK
        2nd
        STK
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
        290
        32.5
        5H22
        3rd
        1.5
      • Pro Circuit
        280
        35
        STK
        2nd
        STK
      • YZ125
        350
        45
        6BEF16-69
        4th
        2
      • Pro Circuit
        STK
        STK
        STK
        2nd
        1.5
      • YZ250
        172
        48
        N3VF
        2nd
        2
      • Pro Circuit
        170
        STK
        STK
        STK
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM80
        210
        35
        5DP39
        4th
        1.5
      • Pro Circuit
        190
        30
        STK
        2nd
        STK
      • RM125
      • Pro Circuit
        168
        55
        STK
        3rd
        1.5
      • RM250
      • Pro Circuit
        165
        42
        NOZG
        4th
        1.5
        Needle# 16009-1759
      • RMX250
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
        200
        30
        5114
        STK
      • Pro Circuit
        STK
        STK
        STK
        2nd
      • KX80
        125
        58
        N5HF
        3rd
        1.5
      • Pro Circuit
        122
        STK
        STK
        STK
        STK
        52T Rear, BR10EV Plug
      • KX100
        125
        55
        N5HF
        3rd
        1.5
      • Pro Circuit
        122
        STK
        STK
        STK
        STK
      • KX125
        160
        42
        1469
        3rd
        1.5
        50
      • Pro Circuit
        158
        STK
        STK
        4th
        STK
        STK
      • Bored
        165
        STK
        1468
        4th
        STK
      • KDX220
        145
        45
        R1173L
        3rd
        1.5
      • Pro Circuit
        148
        STK
        STK
        2nd
        STK
      • KX250
        158
        45
        NOZG
        3rd
        1.5
        55
      • Pro Circuit
        STK
        STK
        STK
        2nd
        STK
        STK
      • KX500
        168
        58
        N82N
        3rd
        1.5
      • Pro Circuit
        STK
        55
        STK
        2nd
        STK
      • Off Road
        168
        55
        N82Q
        3rd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R
        122
        55
        A2410A
        3rd
        1.75
      • Pro Circuit
        STK
        STK
        STK
        2nd
        1.5
      • CR125R
        172
        50
        1368
        3rd
        1.75
      • Pro Circuit
        165
        52
        STK
        2nd
        1.5
      • CR250R
        175
        55
        1369
        3rd
        1.75
      • Pro Circuit
        165
        STK
        1370
        2nd
        1.5
      • CR500R
        170
        55
        1368
        3rd
        1.5
      • Pro Circuit
        STK
        STK
        STK
        2nd
        STK
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
        290
        32.5
        5H22
        3rd
        1.5
      • Pro Circuit
        280
        35
        STK
        2nd
        STK
      • YZ125
        350
        50
        6BEG9-69769
        3rd
        1.5
      • Pro Circuit
        STK
        45
        STK
        2nd
        STK
      • YZ250
        170
        48
        N4DG
        3rd
        1.5
      • Pro Circuit
        STK
        STK
        STK
        2nd
        STK
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM80
        210
        35
        5DP39
        4th
        1.5
      • Pro Circuit
        190
        30
        STK
        2nd
        STK
      • RM125
        175
        50
        1469
        4th
        1.5
      • Pro Circuit
        170
        STK
        STK
        2nd
        STK
      • RM250
        175
        48
        NIED
        3rd
        1.75
      • Pro Circuit
        168
        45
        NOZG
        STK
        1.25
        (KX250 Needle) 16009-1759
      • RMX250
        150
        60
        1472
        3rd
        1.5
      • Pro Circuit
        178
        52
        1469
        STK
        STK
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
        200
        30
        5114
        STK
      • Pro Circuit
        STK
        STK
        STK
        2nd
      • KX80
        122
        55
        N684
        3rd
        1.5
      • Pro Circuit
        STK
        STK
        2nd
        STK
      • KX100
        132
        55
        N684
        3rd
        1.5
      • Pro Circuit
        STK
        STK
        STK
        2nd
        STK
      • KX125
        160
        40
        N2EJ
        3rd
        1.5
      • Pro Circuit
        158
        38
        NIAK
        3rd
        1.25
        STD 35mm
      • Big Bore
        158
        38
        NIAK
        4th
        1 1/43
        Bore 36mm
      • KDX220
        145
        45
        R1173L
        3rd
        1.5
      • Pro Circuit
        148
        STK
        STK
        2nd
        STK
        B9EV Plug
      • KX250
        165
        45
        N3WF
        3rd
        1.5
      • Pro Circuit
        STK
        STK
        NOZG
        STK
        STK
        (KX250 Needle) 16009-1759
      • KX500
        168
        60
        N82R
        3rd
        1.5
      • Pro Circuit
        STK
        STK
        STK
        2nd
        STK
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R
        122
        55
        A2410A
        3rd
        1.75
      • Pro Circuit
        2nd
        1.5
      • CR125R
        172
        50
        1369
        3rd
        3.5
      • Pro Circuit
        165
        52
        2nd
        1.5
        Close Idle
      • CR250R
        175
        52
        1369
        3rd
        2
      • Pro Circuit
        172
        2nd
        1.5
        Close Idle
      • CR500R
        170
        55
        1368
        3rd
        1.5
      • Pro Circuit
        2nd
        Close Idle
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
        270
        35
        5H22
        3rd
        1.5
      • Pro Circuit
        2nd
      • YZ125
        350
        55
        6BEG9-69
        3rd
        1.75
      • Pro Circuit
        2nd
        1.5
      • YZ250
        175
        42
        N3CD
        3rd
        1.75
      • Pro Circuit
        2nd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM80
        210
        35
        5DP39
        4th
        1.5
      • Pro Circuit
        190
        30
        2nd
      • RM125
        170
        50
        R1469M
        3rd
        2
      • Pro Circuit
        172
        52
        1.25
      • RM250
        172
        58
        1467
        3rd
        1.5
      • Pro Circuit
        175-178
        55
        2nd
        1.25
        Close Idle
      • RMX250
        150
        60
        1472
        3rd
        1.5
      • Pro Circuit
        178
        48
        1469
        II141-28610 Head Gasket
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
        200
        30
        5114
        3rd
      • Pro Circuit
        2nd
      • KX80
        122
        55
        N68U
        3rd
        1.5
      • Pro Circuit
        2nd
      • KX100
        132
        55
        N68U
        2nd
        1.5
      • Pro Circuit
        130
      • 28mm Carb
        132
        55
        N68U
        3rd
        1
        Part #15001-1457
      • KX125
        162
        42
        N2EJ
        3rd
        1.5
      • Pro Circuit
        158
        35
        NIAK
        4th
      • KDX200
        160
        48
        R1174K
        3rd
        2
      • Pro Circuit
        2nd
        1.5
      • KX250
        160
        45
        NIED
        3rd
        2
      • Pro Circuit
        158
        NOZG
        2nd
        1.5
      • KX500
        168
        60
        N82R
        3rd
        1.5
      • Pro Circuit
        2nd
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R Kart
        122
        55
        A2410A
        3rd
        1.75
      • Pro Circuit
        132
        1.5
      • CR125R Kart
        172
        50
        1369
        3rd
        2.5
      • Pro Circuit
        175
        55
        1468
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR80R
        125
        52
        1343
        2
        1.5
      • Pro Circuit
        125
        52
        1343
        2
        1.5
      • CR125R
        172
        58
        1470
        3
        1.5
      • Pro Circuit
        165
        55
        1468
        2
        1.5
        Close Idle
      • CR250R
        175
        55
        1368
        3
      • Pro Circuit
        172
        52
        1369
        3
        1.5
        Close Idle
      • CR500R
        170
        55
        1368
        3
      • Pro Circuit
        170
        55
        1368
        2
        1.5
        Close Idle
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ80
        270
        35
        5H22
        3
        1.5
      • Pro Circuit
        270
        35
        5H22
        2
        1.5
      • YZ125
        360
        50
        6EG36-63
        -
        2
        40
      • Pro Circuit
        360
        50
        STD
        2
        1.5
      • YZ250
        175
        48
        1367
        3
        1.75
      • Pro Circuit
        175
        48
        1367
        2
        1.5
      • YZ490
      • Pro Circuit
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM80
        210
        35
        5DP39
        4
        1.5
      • Pro Circuit
        190-200
        30
        STD
        2
        1.5
      • RM125
        180
        52
        R1469
        3
        1.5
        50
      • Pro Circuit
        172
        52
        R1469
        2
        1.5
        50
      • RM250
        180
        52
        1470
        3
        2
        50
      • Pro Circuit
        172
        48
        1470
        2
        1.5
        50
      • RMX250
        150
        60
        1472
        3
        1.5
      • Pro Circuit
        178
        52
        1469
        3
        1.5
        11141-28C10 Head Gasket
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX80
        122
        55
        N68U
        3
        1.5
      • Pro Circuit
        122
        55
        N68U
        2
        1.5
      • KX125
        162
        42
        N2DL
        4
        1.5
        50
      • Pro Circuit
        160
        42
        N2DL
        3
        1
        60
      • KDX200
        160
        48
        R1174K
        3
        2
        50
      • Pro Circuit
        160
        48
        2
        1.5
      • KX250
        162
        45
        NOZE
        4
        2
        70
      • Pro Circuit
        162
        45
        NOZE
        3
        1.5
      • KX500
        168
        60
        N82R
        3
        1.5
      • Pro Circuit