What are the symptoms of an overly rich air-fuel mixture in motorcycles?
1 Answers
The symptoms of an overly rich air-fuel mixture in motorcycles include decreased power, a rapid drop in engine RPM, and black exhaust emissions from the tailpipe. Below are the specific causes of an overly rich air-fuel mixture in motorcycles: 1. The mixture screw is adjusted too rich or excessively rich. 2. Clogged air filter or exhaust pipe. 3. The needle clip position in the carburetor is at the lowest notch. 4. Loose main jet or idle jet in the carburetor. 5. The choke is partially open or closed. 6. Poor operation of the vacuum diaphragm carburetor or thermistor choke valve starting system. 7. Prolonged motorcycle operation leading to excessive engine temperature.