'90 Kawasaki ZR550 Zephyr, 12.5% opening
Chart Key
Horsepower
Torque
CO%
K&N drop in filter, ND iridium spark plugs, carburetor bodies modified to accept screw-in main air jets, and jetting (at 12.5% throttle opening)
K&N drop in filter (at 12.5% throttle opening)
at 100% throttle opening
at 25% throttle opening
at 6.25% throttle opening
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