And while I'm talking about chokes, when the carbs were apart I noticed one of the little flaps was not retracting into its housing when the other 3 did, so unbolt it's activating rod, pull it out, drop the choke door/flap out of the carb body and into the bag of spares for Terry.
I know it will be fine with chokes on only 3 carbs, years ago when I was on the freeway the throttle jammed wide open, further inspection showed that one of the flaps had snapped and dropped into the throat jamming the slide fully open, wiggled it out and never bothered fixing it. Made no difference to starting