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.

1992

ModelMainPilotNeedlePosScrewPowerSlideNozzleLeakOther
Honda

CR80R



















Pro Circuit12852STD2nd1.5









CR125R



















Pro Circuit1655514682nd1.5







Close Idle
CR250R



















Pro Circuit172STD13692nd1.5







Close Idle
CR500R



















Pro Circuit170STDSTD2nd1.5







Close Idle
Kawasaki

KX60



















Pro Circuit20030STD2nd1.5









KX80



















Pro Circuit12255STD2nd1.5









KX125



















Pro Circuit162STDSTD2nd1.5









KDX200



















Pro Circuit15548STD2nd1.5Use KX500 T/A Filter And
Take Off Air Box Cover








KX250



















Pro CircuitSTDSTDSTD2nd1.5









KX500



















Pro CircuitSTD58N82R2nd2









Yamaha

YZ80



















Pro Circuit28035STD2nd1.5









YZ125



















Pro Circuit31022.5STD2nd1.5









YZ250



















Pro CircuitSTDSTDSTD2nd1.5









WR500



















Pro Circuit440-45045STD2nd2









Suzuki

RM80



















Pro Circuit190-20035STD2nd1.5









RM125



















Pro CircuitSTDSTDSTD2nd1.5









RM250



















Pro Circuit36045632nd1.5









RMX250



















Pro Circuit35045632nd1.5

Take Power Valve Stops Out





1990

ModelMainPilotNeedlePosScrewPowerSlideNozzleLeakOther
Honda

CR80R



















Pro Circuit12852STD2nd1.5









CR125R



















Pro Circuit165STD14682nd1.5







Close Idle
CR250R



















Pro Circuit172STDSTD2nd1.5







Close Idle
CR500R



















Pro Circuit168STDSTD2nd1.5







Close Idle
Kawasaki

KX60



















Pro Circuit20030STD2nd1.5









KX80



















Pro Circuit12255STD2nd1.5









KX125



















Pro Circuit15855STD2nd1.5









KDX200



















Pro Circuit15548STD2nd1.5Use KX500 T/A Filter
And Take Off Air Box Cover








KX250



















Pro CircuitSTD58STD2nd1.5









KX500



















Pro Circuit16858N82M3rd1.5









Yamaha

YZ80



















Pro Circuit28035STD2nd1.5









YZ125



















Pro Circuit32022.5STD2nd1.5









YZ250



















Pro CircuitSTDSTDSTD2nd1.5









WR500



















Pro Circuit440-45045STD2nd2









Suzuki

RM80



















Pro Circuit190-20035STD2nd1.5









RM125



















Pro CircuitSTDSTDSTD2nd1.5









RM250



















Pro Circuit36045STD2nd1.5









RMX250



















Pro Circuit36045632nd1.5