Also work from carb-venturi back to float-bowls.
Bend copper wire 90-degrees 10mm from tip.
Use that to poke out bleed holes from carb venturi backwards.
Spray compressed air and carb-cleaner spray from there backward as well.
Clear out choke circuits with some wire also
Poke out lateral bleed holes in emulsion-tubes, pilot jets. Dried petrol becomes plastic and no kind of solvents will ever dissolve it again. Requires mechanical removal.
Be sure to drill out mixture-screw plugs and remove screws. Replace O-rings