What are the reasons for the difficulty in starting a pull-start gasoline engine?

[CarmenAnn]

Hand-pull gasoline engine is difficult to start because of: 1. Insufficient engine oil in the gasoline engine; 2. Spark plug blockage. Methods for cleaning spark plugs include: 1. Using a spark plug cleaner; 2. Cleaning with carburetor cleaner; 3. Soaking in gasoline, kerosene, or acetone solvent, or boiling in alkaline water. Types of spark plugs include: 1. Standard spark plugs; 2. Insulator projected spark plugs; 3. Electrode-type spark plugs; 4. Seat-type spark plugs; 5. Pole-type spark plugs. The working principle of a spark plug is: Under the control of the engine, the high-voltage electricity generated by the ignition coil is introduced into the engine cylinder, generating a spark between the electrodes of the spark plug to ignite the mixed gas, enabling the engine to operate normally.