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'90 Kawasaki ZR550 Zephyr, 6% opening

Chart Key
Horsepower Horsepower
Torque Torque
CO% CO%
Red K&N drop in filter, ND iridium spark plugs, carburetor bodies modified to accept screw-in main air jets, and jetting (at 6.25% throttle opening)
Turquoise K&N drop in filter (at 6.25% throttle opening)


at 100% throttle opening

at 25% throttle opening

at 12.5% throttle opening
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