What is the solution for an overly rich air-fuel mixture in motorcycles?

[LaCaroline]

Motorcycle air-fuel mixture is too rich solution is: 1. Check the color of the spark plug, if it is carbon black, it means the air-fuel mixture is too rich, the gap between the spark plugs is too large, and it should be replaced in time; 2. Check the carburetor and air filter, if the mixed oil contains too much engine oil, the combustible gas cannot be completely burned, which will cause the engine to emit black smoke during operation. Motorcycles are driven by gasoline engines, with handlebars controlling the front wheel steering, two-wheeled or three-wheeled vehicles, lightweight and flexible, fast driving, widely used for patrol, passenger and cargo transportation, etc., also used as sports equipment.