Note: Excessive fuel consumption and poor engine performance are not necessarily the result of a faulty fuel system or carburetor. Before attempting to diagnose a fault using the chart below, you should check that the ignition system is in good condition and properly adjusted, the tire pressure is correct, the brakes are not sticking, and the engine is in good mechanical condition.
| Symptom | Reason(s) |
| Excessive fuel consumption | Leak from fuel tank, pump or fuel lines Flooding of the float chamber The air filter is clogged The preheating system for the air entering the air purifier does not work well The carburetor is incorrectly adjusted The automatic choke does not work well General wear of the carburetor. |
| Insufficient fuel supply | Low fuel in the fuel tank The fuel filter is clogged The fuel pump is faulty Leak in the fuel line on the inlet side of the pump. |
| Too lean mixture | Air leaking into the intake manifold or carburetor Air filter missing The carburetor is poorly adjusted or the jets are clogged. |
| Popping sounds in the exhaust system | Air leakage into the exhaust manifold Malfunction of the exhaust gas afterburning system Incorrect mixture composition One of the exhaust valves is burnt or does not fit well on the seat. |
Visitor comments