Harley 883 throttle detection

Black smoke is caused by excessive mixture and incomplete combustion. The reason is that the automobile engine is overloaded, the cylinder pressure is insufficient, the engine temperature is too low, the carburetor is improperly adjusted, the air filter element is blocked, and some cylinders do not work. Solution: Look at the main nozzle from the oil filler after flameout. If oil drops, it means that the oil level in the float chamber is too high, so it should be adjusted to the specified range, and the main metering hole should be tightened or replaced. The air filter is blocked and should be cleaned, dredged or replaced.