'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)