If the ignition system is OK, you must check the fuel system below.
Books and troubleshooting guides often advise you to check if the fuel is actually coming to the engine by removing and examining the spark plug after several pulls of the starter cord. It must be moist, but a damp plug indicates flooding. However, at the time the plug is removed and if the weather is warm, any moisture can evaporate, so this is not a totally reliable method to identify a problem with the carburetor.
The fuel flows from the tank to the carburetor. The function of this device is to create an explosive fuel mist mixed with air, which is aspired to the engine to burn it and provide energy. An air filter cleans the incoming air to prevent malfunction and damage to the engine. Several problems in this section of the engine can cause starting difficulties or loss of power.
These include:
- Dirty air or fuel filters
- Clogged jets
- Parts that are badly sealed
- Punctured or worn components
- Moving Parts sticking
- Water in the tank
Diagram of a carburetor
A carburetor filters air and mixes it with fuel, forming a fine mist which gets sucked into the engine.
A carburetor filters the air and mixes it with fuel, forming a fine mist that is absorbed into the engine.
Carburetor seal or O-ring
The carburetor must be properly sealed with the motor screws or tightened, and the O-rings must not wear out or be damaged.