AWJDT- it is indeed a pre OIF B25, it has Starfire decals on it, so assumed that is what it is. There seems to be too much inner cable to outer length. I think nearly 35mm. This is the cable that was on when I got the bike, so part number unkown.
Julian- it is not merely spongy, but cannot 'wind in' enough slack to make the shoes contact, except merely rubbing lightly; I may shorten the inner if no other obvious defect shows up, after the previous advice has been tried. Thank you everyone.
FWIW, I had read that these were a pain to adjust, and not so hot even when done correctly. I think it will be OK, (eventually) and am not worried, lol!