Thanks for the tip but Good Gosh I must be the stupidest person on the planet!
I was trying to trace the source of a noise and had put a zip tie around the left grip and clutch lever to hold it in so I could listen to the engine running with the clutch lever pulled in... and I completely forgot it was there. Clipped it off and surprise, surprise - the kick start works like new.
(I swear I wasn't drinking and I'm not on medications - although after this, maybe I should be...) Thanks guys... once again - saved by the SOHC Forum!
PS: it's a '71 CB500 - should have mentioned that in the first post.