Hi Artists..., as far as balancing goes, cheers for the advice, but I also need to get the mixture right, as it is a bit rich (I found a friendly, sympathetic MOT tester), but I do not want to lean it off myself as I do not really know how to tell if I have gone too far, until it pinks and burns a hole in a piston :-o.
Choke cable and route are not the problem, as once I have got the mechanism to move over the initial "fulcrum" it operates freely. Its just the first quater or so of the movement that is a problem, I have managed to pull the end off of two cables so far and at £12 - £15 a go I do not want to break any more, hence I am after someone with greater knowledge than I to point me in the right direction.