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