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
      • Pro Circuit
        128
        52
        STD
        2nd
        1.5
      • CR125R
      • Pro Circuit
        168
        62
        STD
        2nd
        1
      • CR250R
      • Pro Circuit
        172
        STD
        STD
        3rd
        1.5
      • CR500R
      • Pro Circuit
        172
        52
        STD
        3rd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • YZ125
      • Pro Circuit
        290
        22.5
        STD
        2nd
        1.25
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM125
      • Pro Circuit
        360
        60
        STD
        2nd
        1
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX60
      • Pro Circuit
        200
        30
        STD
        2nd
        1.5
      • KX80
      • Pro Circuit
        140
        58
        STD
        2nd
        1
      • KX125
      • Pro Circuit
        155
        58
        STD
        3rd
        1.5
      • KX250
      • Pro Circuit
        172
        55
        STD
        2nd
        1.5
      • KX500
      • Pro Circuit
        170
        60
        STD
        3rd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR125R
      • Pro Circuit
        165
        60
        1469
        3rd
        1.5
      • CR250R
      • Pro Circuit
        175
        62
        1347
        2nd
        1.5
      • CR500R
      • Pro Circuit
        168
        58
        1370
        2nd
        1.75
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM250
      • Pro Circuit
        170
        68
        1368
        3rd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • KX125
      • Pro Circuit
        172
        68
        1368
        3rd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR125R
      • Pro Circuit
        165
        62
        1468
        3rd
        1
      • CR250R
      • Pro Circuit
        170
        60
        1368
        2nd
        1.75
      • CR500R
      • Pro Circuit
        168
        58
        1370
        2nd
        1.75
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • RM250
      • Pro Circuit
        170
        68
        1368
        3rd
        1.5
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR125R
      • Pro Circuit
        158
        65
        1470
        3rd
        1
      • CR250R
      • Pro Circuit
        170
        60
        1368
        3rd
        1.75
      • CR500R
      • Pro Circuit
        168
        60
        1372
        3rd
        1.75
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR125R
      • Pro Circuit
        152
        62
        1472
        3rd
        1
      • CR250R
      • Pro Circuit
        158
        65
        1368
        3rd
        1.5
      • CR500R
      • Pro Circuit
        168
        65
        1370
        3rd
        1.75
      • Model
        Main
        Pilot
        Needle
        Pos
        Screw
        Power
        Slide
        Nozzle
        Leak
        Other
      • CR500R
      • Pro Circuit
        162
        68
        314
        3rd
        1.5
      • Model
        Year
        Main
        2nd Main
        Pilot
        Needle
        POS
        Screw
      • TRX250EX
        2001
        122
        38
        Stock
        N/A
        N/A
      • Pro Circuit
        2001
        N/A
      • TRX300EX
        1993-2007
        122
        38
        Stock
        N/A
        N/A
      • Pro Circuit
        1993-2001
        N/A
        N/A
        N/A
        N/A
        N/A
      • TRX400EX
        148
        38
        Stock
      • Pro Circuit
        158
        58
        Stock
        Stock
      • Model
        Year
        Main
        2nd Main
        Pilot
        Needle
        POS
        Screw
      • 200 Blaster
        1988-2002
        230
        32.5
        Stock
      • Pro Circuit
        1988-2002
        240
        32.5
        Stock
        Stock
      • 350 Banshee
        1987-2002
        200
        25
        Stock
        Stock
      • Pro Circuit
        1987-2002
        260
        25
        Stock
        Stock
      • Mod Motor
        1987-2002
        Dyno Jet Kit
      • Raptor 660
        2001
        140
        145
        22.5
        Stock
        1.5
      • Pro Circuit
        2001
        145
        150
        22.5
        Stock
        2
      • Grizzly 650
      • Pro Circuit
      • Model
        Year
        Main
        2nd Main
        Pilot
        Needle
        POS
        Screw
      • LTZ400
        N/A
      • Pro Circuit
        160
      • Model
        Year
        Main
        2nd Main
        Pilot
        Needle
        POS
        Screw
      • KFX400
        N/A
      • Pro Circuit
        160