CARB ADJUSTMENT
The Float adjustment usually involves carefully bending a tab against the needle valve where the fuel enters the float bowl. Since the float, "floats", there is no external adjustment. The float should close the valve at a specific height, and open as the fuel level drops, thus controling the level of fuel in the bowl, which in turn controls the amount of fuel being ingested by the carb. As for cleaning, any over the counter fuel system cleaning additive will help with that, from any auto parts store.
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