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Well it's pretty simple, you have excess air or insufficient fuel for proper combustion with the choke open. Saying that is the easy part, now the hard part is finding out which and where. Start with checking for an air leak at the intake manifold gasket(s), carb/uptake gasket, and the carb throttle shaft. With engine running spray carb cleaner on suspected leaks, the engine will bog down some. Insufficient fuel is harder. Can be a plugged gas cap vent, crap in the gas tank or fuel line to the carb, sediment bowl restriction like screen plugged or valve restricted, carb float adjustment, restriction at float valve, main or idle jets, including the orifices in the side of the fuel nozzle or the passages in the carb body. The power needle may be bent and touching the side of the orifice. Idle or power needle adjustment may be too far out. The idle mixture screw controls air, turning in CW richens the mixture at idle rpm. The power needle controls fuel at higher rpm, turn out CCW to richen mixture. Joe
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