I put a previous post on regarding excessive fuel consumption (which is still a symptom) but I have further symptoms/characteristics of this particular bike which may help with a diagnosis - (though still think a brand new carb might address everything).
Today I went out on a run. The bike started firtst kick before setting off (petrol on, tickle carb, three kicks, choke on, ignition on - fires up easily). However, I stopped for five mins 20 miles on and, on trying to re-start, it just wouldn't have it. I removed plugs, kicked it over, re-fit plugs and still no joy (though a lovely loud explosion in one silencer!) Eventually re-started with a bump downhill and then ran fine. If the bike stands for half an hour or so then it fires up straight away (without any choke). Whilst running, if I do put any choke on at all it dies.
A couple of things I've noticed - idle level rises quite a bit when engine heated up, and no futher adjustment available on setting of slide height (so fully seated). Pick up/acceleration from closed throttle is perky, but there seems to be a spot at part throttle where it doesn't want to rev any more/deliver more revs, however I noticed that if I wind the throttle open more it picks up again and delivers more power and revs out.
I'm not a carb expert by any means, though the black plugs and the fact it falters with any choke at all once running would indicate a rich state. However, the higher idle when hot could indicate a lean one.
Any ideas please?