RE: Ever had an engine that wouldn't lean out?
Bubbles in the fuel line will LEAN the engine.....air leaks anywhere will also LEAN the engine......foaming fuel LEANS the engine as well....you sound like you have a RICH problem....Just a suggestion but I have a Perry Carb that the High Speed needle backs itself out and richens the mixture. If you screw a needle in to tight on some carbs you can damage the spray bar/needle and will never be able to lean the engine, because you can't shut down the fuel supply.