Old petrol blocked carbs are a swine. Do check the choke ccts as well, those tubes into the bowls need to flow and there needs to be connection right up to where the chokes seal off. I needed to run a 0.3mm drill through some. Pipes stayed cold on some until warm enough not to need choke and choke was working on some cylinders so they worked proper.
Then I found the fuel hose kinked when tank on. In line Filters cause kinks.
Missing vacuum take offs can catch you. I had some carbs from another bike vs gravity tap on this one.
Suzuki tanks of the era just love to rust inside and the silt gets everywhere.
Don't you look at my accountant.
He's the only one I've got.
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