What Causes a Four-Stroke Motorcycle to Emit Black Smoke?

1 Answers
MakaylaDella
07/25/25 4:26am
The reasons and solutions for a four-stroke motorcycle emitting black smoke are as follows: Reasons for emitting black smoke: Excessively rich air-fuel mixture, excessive oil in engine fuel, poor sealing of piston rings or crankshaft oil seals, water in the fuel, faulty spark plug, excessively dirty air filter. Solutions for emitting black smoke: To inspect and diagnose an excessively rich air-fuel mixture, focus on checking the carburetor and air filter. The mixture ratio of fuel and oil is incorrect, or the wrong type of oil is used. If the mixed fuel contains too much oil or the oil quality is poor, the oil in the combustible mixture cannot burn completely, resulting in black smoke emission.
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