I have a 19993 cb 750 nighthawk. I have cleaned the carbs and replaced the floats, but i have 2 cyls still running rich. Could it be from the , what honda calls the starter valve(choke)?

SOURCE: 92 honda cb 750, oil light will not go out, bike won't start

Look around the engine oil drain plug and fill area and see if there is an electric sending unit( small plug with a prong for a wire) that is screwed into the engine if so check to see if its unplugged / could be a low oil cut off switch that kills all power to the ignition if the oil is to low ( or the wire is unplugged)

SOURCE: where is the idle screw for cb nighthawk 750

follow your accel cable to the carb. move the throttle till you see where the linkage moves. look around the linkage to see what it hits on at no throttle. that will be your idle screw

SOURCE: Engine running rich?

worn float needle or obstructed airflow (plugged foam filter)

SOURCE: best way to clean carbs on 94 750 honda,been

The best way to clean any carbs that have been sitting is to remove them from the engine and carefully disassemble, one at a time, clean everything with a spray on carb cleaner. Pay attention to "varnish" dried gas that looks amber on the metallic parts. This causes the jets to not seat properly and the float to stick, patience and doing on thing at a ime makes it easy to put things back together.

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SOURCE: 1993 honda nighthawk 750 tach. not working

i have found in the past its the cable not the tacho