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°F 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°F temperature.

Please Note: The stock OEM jetting for your specific model is listed first, followed by our recommended jetting underneath that model.

2022

ModelMainPilotNeedlePosScrewPowerSlideNozzleLeakOther
Honda

CRF150R13838NMQS32.5

1.5

58

Pro Circuit13845NMQS32.5





58

CRF250X13040NCYU22





65

Pro Circuit15842NCYS42.25





55

CRF450X14545NCVU22.5





70

Pro Circuit15545NCYS32.25

70

Yamaha

YZ6514245NAPF22.5









PC MRX0214248NAPF32.5









YZ8513845NBKF22.25









PC MRX0214545NAPG32









PC YZ11213542NBKF22









YZ12516072NYEF22.75









Pro Circuit

TTR12510515















Pro Circuit107.515Stock31.75









YZ25017850N3EW2150







Pro Circuit17548N3EW21507.0





Suzuki

RM8512550NAAH22









Pro Circuit12548NAAH22









PC RM11212548NAAH22









Kawasaki

KX65190255GSP6831.5









Pro Circuit

MRX02210305GSP6831.5









KX8514038NRJC31.5









KX85 PC14245NAPD32









Mammoth14042NAPD22









VP C12

VP110

MRX02

KX11214842NRKC3

1.5









KX112 MRX0214542NAPD 

 









KX112 PC14242NAPD 

 









KX109 PC

VP C12

VP110

MRX02

KTM

KTM 50 SX

Pro Circuit

KTM 65 SX21015StockTop3.5









Pro Circuit

KTM 85 SX14548NRKC21.5









Pro Circuit14245NRKC21.75









KTM112 PC

MRX02

KTM 125 SX50035

21.5









PC MRX0251037.5

22









PC VP C1249032

21.5









KTM 150 SX4703542-7432









PC MRX0248037.542-7432









PC VP C1246032.542-7432









KTM 250 SX45035

3











PC MRX0245537.5

31.5-2









PC VP C1244532

31.5-2









KTM 300 XC

Pro Circuit

Cobra

CX 50 JR

Pro Circuit

CX 50 SR9560W7













Pro Circuit9355W7













CX 6528042.5RI144











Pro Circuit27042.5RI143











Husqvarna

TC 65

PC MRX02210205IPL4323.5









2021

ModelMainPilotNeedlePosScrewPowerSlideNozzleLeakOther
Honda

CRF150R13838NMQS32.5

1.5

58

Pro Circuit13845NMQS32.5





58

CRF250X13040NCYU22





65

Pro Circuit15842NCYS42.25





55

CRF450X14545NCVU22.5





70

Pro Circuit15545NCYS32.25

70

Yamaha

YZ65

PC MRX02140-14248NAPF22









YZ8513845NBKF22.25









PC MRX0214545NAPG32









PC YZ11213542NBKF22









YZ125

Pro Circuit420386BFY43-7431.75









TTR12510515OEM













Pro Circuit107.515Stock31.75









YZ25017850N3EW2150







Pro Circuit17548N3EW2150







Suzuki

RM8512550NAAH22









Pro Circuit12548NAAH22









PC RM11212548NAAH22









Kawasaki

KX65190255GSP6831.5









Pro Circuit20027.55GSP6821.5









MRX02210305GSP6831.5









KX8514038NRJC

1.5









KX85 PC

Mammoth14045NAPD2











VP C1214042NAPE(D)3rd1.5

3.5





VP11014245NAPE(D)3rd1.5









MRX02142/14545NAPD3rd1.5









KX10014038NRKC3rd1.5









KX109 PC

VP C1214245NAQC3rd1.5

3.5





VP11014548NAQC3rd1.5

3.5





MRX02145/14845/48NAQC3rd1.5

3.5





KX112 PC

Mammoth14045NAQC3











KTM

KTM 50 SX

Pro Circuit

KTM 65 SX21015StockTop3.5









Pro Circuit

KTM 85 SX14548NRKC21.5









Pro Circuit14245NRKC21.75









KTM112 PC

MRX02

KTM 125 SX50035

21.5









PC MRX0251037.5

22









PC VP C1249032

21.5









KTM 150 SX4703542-7432









PC MRX0248037.542-7432









PC VP C1246032.542-7432









KTM 250 SX45035

3











PC MRX0245537.5

31.5-2









PC VP C1244532

31.5-2









KTM 300 XC

Pro Circuit

Cobra

CX 50 JR

Pro Circuit

CX 50 SR9560W7













Pro Circuit9355W7













CX 6528042.5RI144











Pro Circuit27042.5RI143











Husqvarna

TC 65

PC MRX02210205IPL4323.5