It sounds like your bike has been sitting in storage for an extended period of time (a year or more) - and the carburetors are plugged up. If this is the case, they will need to be completely disassembled and cleaned out.
If it hasn't been sitting (and the carbs aren't plugged up) then check that all of the normal tune-up items have been performed, especially valve adjustment, oil and filters, spark plugs, etc. If this fails to produce positive results, perform a compression check on the engine. Each cylinder must be able to produce at least 140 psi of compression in order to run and idle properly.
If it's fine on choke you've probably got mixture screw issues. They get cakes up very easily. Sounds like you're starved of fuel. I had the same issue. Drop the mixture screw from #1 carb completely. Watch ya get the spring washer n O ring. Check for signs of stale fuel oxidation etc Put your finger over the entry for the screw and start the bike. You'll probably get an increase in revs because yer now running a mixture that is really rich providing the jet isn't blocked. Drop your finger and listen for a change. If there's no change, poke out the jet with a really fine E string off a guitar. It's a bit fiddly but worth the effort. Repeat the test. Try this in #2 carb n covering both holes, ya can do it with one hand. If things improve again you've got your answer. Ya really need to drop the carbs n do a proper clean. Also, check the 2 brass pipes at the rear aren't blocked( guitar string it). A big syringe n some 6mm plastic tube are really handy for blowing through that idle jet through n the brass airways.
Before ya replace the idle screw remove all traces of scale n polish very very lightly with Autosol or such so they have a shiny surface again or just replace. Hand/easy adjust screws might be an idea. Hope this helps
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