With such a light mixture, a choke must be used to keep it running
smoothly during warmup. Prior to 1978, Honda hadn't yet devised an
automated system using an electric choke element that would satisfy
all conditions, so a manual, calibrated choke was used..."one click"
for mild weather when starting cold, two for colder weather, and full
closed for very cold or long periods of sitting.
Good explanation, I had forgotten of the unique nature of
the engine.
maintained well. My '75 Civic CVCC
Or "rotting honda" as some would dub them.