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Sticky Float Valves

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the-chauffeur:

You might also want to take a quick look inside the carbs at the little towers the carb floats attach to. 

It's not unheard of for the metal casting to have degraded over time or just be generally poor quality.  If the float arm catches on rough edges as the float shifts off-centre very slightly, it'll prevent the float assembly from falling cleanly as the fuel level drops. 

SteveW:
Don’t know if this is relevant but my 66 Lambretta had a similar problem.
The modern fuels cause the float to swell very slightly.
The float is made of an upper and lower part with a seam around the middle. When the float swells the seam rubs on the carb body causing it to stick.

simonc:
no expert but next time you strip carbs check post tang { not the the height .floatv/v tang ] i have known these to catch on top of posts

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