On older, disused carbs EVERY pathway and system, both visible and not should be considered suspect (clogged) until proven not to be. Sitting for years with rotted fuel, it invades all.
Getting it all dealt with in one shot can be frustrating and difficult, where coupling aggressive methods and knowing "what to do where" become important. Different parts and differing systems require various methods, within both the cleaning and setup process.
Whatever you do...remove the slides and keep them safely away from chemicals or mayhem! Soap and water only, if cleaning them! The actual rubbers can be safely "rubbed down" with Armor All.
And don't lose the needle jets! (very common)
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