20-06-13, 08:23 AM
Things I would do
Check inside the airbox, any signs of emulsion in there?
Is you crankcase breather clear and working.
I 've had a sticking float valve in the past. on a different bike
The float wouldn't push the valve into the closed position, this resulted fuel flowing out of the atmospheric vent of the carb and pouring fuel over the outside of the engine.
So I don't think that you have a float valve related problem unless the atmospheric vent is blocked, but then you would have very bad running problems and would know something is up with the carbs.
My favorrite at the moment is that your crankcase breather is blocked or pinched somehow not allowing the flow of vapour and crankcase gas to escape into the airbox and be burn through the engine and escape.