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.

2025

ModelMainPilotNeedlePosScrewPowerSlideNozzleLeakOther
Honda

CRF150R13838NMQS32.5

1.5

58

Pro Circuit13845NMQS32.5

1.5

58

Yamaha

YZ6514245NAPF22.5



 



PC MRX0214248NAPF32.5



 



YZ8513845NBKF22.25



 



PC MRX0214545NAPG32









PC YZ11214545NBKF32









YZ12516072NYEF22.7535







PC MRX02/C1216562Y421.5-270



 

PC Pump Gas16568Y431.2570







TTR12510515





 



 

Pro Circuit107.515Stock31.75 



 

YZ25017850N3EW2150



 

Pro Circuit17548N3EW21507.0





Kawasaki

KX65190255GSP6831.5

  



Pro Circuit20027.55GSP6821.5

  



MRX02210305GSP6831.5

  



KX8514038NRJC31.5

  



Pro Circuit14245NAPE32









Mammoth14042NAPE22









VP C1214042NAPE31.5









VP11014245NAPE31.5









MRX0214545NAPE31.5









KX11214842NRKC3

1.5

 





MRX0214542NAPD2

1.5

 





Pro Circuit14242NAPD2

1.5

 





KTM

KTM 50 SX

Pro Circuit

KTM 65 SX

Pro Circuit

KTM 85 SX14055NRKC31.5









Pro Circuit

55NRKC31.5-2









KTM112 PC14858NRjC31.5-2









MRX02



















Cobra

CX 50 JR5592W-731.5







Pro Circuit

CX 50 SR5593W-721.5







Pro Circuit

CX 50 FWE5593W-721.5









CX 6528042.55I14-42











Pro Circuit

Husqvarna

TC 65

PC MRX02