Alrighty then, considering condition of engine, carbs will need complete restoration. Disassemble down to very last nut, bolt, and individual component.
Scrub everything with PEA-based fuel-system cleaner, including hidden secret passages in carb body. Spray "carb cleaner" no longer works due to removal of chlorinated compounds. Pee works better since it has some ammonia in it!
https://www.amazon.com/dp/B01N8SX03W
https://n4mwd.blogspot.com/2013/10/s...-passages.html
Be sure to not lose needle-jet/collar when you disassemble emulsion tube. Poke out all lateral bleed holes in jets & emulsion tube. It'll push out little plugs of dried petrol varnish plastic like little grains of sand. No way they'll dissolve with any kind of solvent.
Choke jet isn't removable, still needs to be poked out with wire. Recent case had that jet so clogged, it needed drilling out with micro-bit!
Then soak everything in ultrasonic overnight. DO NOT use Simple Green, it dissolves metals and ultrasonic speeds up this damage.
Next micro soda-blast everything. Lots of petrol varnish fragments and chads hang around in tiny passages after all this scrubbing and cleaning.
Then reassemble with new rubbers: float valves, float-bowl seals, pilot and fuel-rail O-rings, slide diaphragms as needed. Make sure needle-jet/collar is oriented with beveled end facing slide needle.
Set float levels and do wet-test. Synch carbs. Set pilots for best warmed-up idle speed.
Now bike should run like brand-new off showroom-floor when carbs have been restored to factory-fresh clean.