Please use them for comparative purposes only, Your actual numbers may vary but the percentages of change should be very close, given the same equipment. This refers to a DynoJet jet kit utilizing new slide springs, needles and main jets with the stock Kawasaki air filter. The stock ZRX lobe centers are 100 deg. Jetting was optimized for each configuration and the test was carried out on our Schenk Eddy Current Dynamometer. The engine was stabilized at wide open throttle at each rpm increment and held for approximately 10 seconds, power was reduced, the RPM reset and power re-applied and held at the next level.
Numbers are rear wheel power, corrected to standard day, sea level conditions.
This is the stage 1 jet kit on the stock bike. You actually end up losing torque and gain very little power. If you want to install the cams, do so with the full exhaust and stage 1 jetting. The bike will feel very different. The ZRX with the drop in cams, full exhaust and appropriate jetting is a gas to ride and for the dollars spent, gives one of the best rides around.