Choke cable sticking/not working

In the meantime whilst I decide what to do with the Monster (see other thread), my chock cable seems to have stopped working. I can open the choke, but then it refuses to shut. The lever comes back but the cable seems too long?

Does this mean the cable has stretched or is it some other issue with routing?

I have lubricated the choke mechanism but still it refuses to return to closed.

IIRC the Bowden cable is a set length. I do have clip-ons, which, if anything has moved the choke cable further away from the carbs by virtue of them being wider than my bars??