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After many months of trying to
fix Colin Spanswick's carbs, I eventually figured it out. They had
been having intermittent flooding problems and it wasn't always the same carb that was flooding.
All the float height settings were correct and nothing would be found
on dismantling.
What I finally discovered was that the tang
on the float arm (arrowed in 1st picture) was allowing the needle
valve to drop too far and jam (you can actually see the valve in the
jammed position above the arrow). This is what caused the carb
to flood but the process of removing the carbs always unjammed the
valve.
The normal setting can be seen in
the 2nd picture.
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