1978 KZ650 C3 : Not firing on one cylinder update

Checked that the plug was firing as advised and yes, good healthy spark on
affected cylinder. Removed drain plug screw from carb float bowl and flushed
through by turning fuel tap to prime position. I've even stuck some Redex in
the tank. All to no avail. Bike starts great. Seems to rev okay when
standing still. But drive away on it and it's hard to rev beyond 3k rpm.
Yanking the choke open rips it into life but fades away again as soon as the
chokes closed again. It sounds like fuel starvation on carb two but any
ideas as to what's causing this? And better still, suggestions as to how i
can overcome the problem?
I assume i shouldn't try revving the nuts off it in an attempt to clear the
blockage. I seem to remember that four cylinder engines dont like being
revved when one or more cylinders aint firing properly.

 

blocked jets, or split diaphragm, week plug breaking down under load,
blocked air filter, condenser gone


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BOG wrote >

More likely, but question is, how do i unblock it? Is there some gunk i can
pour through the system that'll flush out any crap?

 

Nah, the carbs are gonna have to come off and properly looked
at/cleaned. Then you know they are not at fault.
No easy way there mate.