hi, my name is brian and I live in farnborough, kent (between bromley and orpington for those who know the area) and I have a 1977 (registered 1978) 400f.
ive had it about 4/5 months and it was a bitsa but I have almost finished the rolling chassis with ‘used’ parts but still need the front mudguard (this one has the first 6” cut off) and the metal brake pipe along with the lower flexi pipe to replace what seems to be one off a cb400.
can’t say it wanted to run other than on full choke and one of the pipes stays cold (bit difficult to say for certain as its not cooperating but I will look at that after the carb – and when it’s a bit warmer) but to give you an idea of the condition I took the carbs apart and none of the needle slides were anywhere near the same as each other, the slow running jets were all blocked, one of the main jets was a completely different 'push fit' jet/different bore, and one of the spring clips was broken in half, the needle was set to pos.2 not 3 (not a major but changed) and the overstop and other settings were off – but hey that’s the fun!
looking at the cam adjustment I can’t say I’m looking forward to ‘messing with it’ but maybe when it is running at won’t need altering.
hope to meet anyone local at some point.