Why does the motorcycle have intermittent fuel supply issues?
2 Answers
Intermittent fuel supply issues in motorcycles are often caused by a clogged carburetor. The carburetor has two fuel passages: one is the main jet, and the other is the idle jet. If the main jet is partially clogged, it can still supply some fuel, causing the motorcycle to jerk or stutter. To resolve this, thoroughly clean both the main jet and idle jet of the carburetor, and also clean the air filter element. Additional checks: Inspect the air filter element for oil saturation or blockage, check if the carburetor's air-fuel mixture is too rich or too lean, verify the fuel level and needle height are correct, and ensure the electronic enrichment device (choke) closes properly after the engine warms up. Inspect the ignition system: Check components such as the spark plug, spark plug cap, high-voltage wire and coil, ignition unit, and magneto coil for any issues, and ensure all connections are secure without loose contacts, open circuits, or short circuits.
When I was riding my motorcycle, I encountered intermittent fuel supply issues. It felt like the bike suddenly lost power and then recovered, which was quite frustrating. The main reasons could be that the fuel in the tank was too dirty, with impurities clogging the fuel line, or the fuel filter was too dirty, preventing fuel from passing through. In carburetor models, if the nozzle gets stuck due to dirt buildup, the fuel supply becomes unstable. An aging or low-pressure fuel pump can also cause this issue. For fuel-injected motorcycles, it might be due to clogged injectors or faulty sensors. I remember once during an inspection, I found the fuel line filter screen completely clogged with debris, and after cleaning it, the problem improved. It's important to develop good habits, such as changing the fuel filter every few thousand kilometers, using high-quality gasoline, and avoiding off-brand fuels. Safety comes first—if symptoms appear, pull over immediately and don't push through, as running out of fuel at high speeds can be extremely dangerous.
