The lawn mower not starting may be caused by the following reasons

No gasoline: The solution is to add gasoline.

Spark plug wire detachment: The solution is to reconnect the spark plug wire.

The throttle switch is not in the starting position: The solution is to adjust the throttle switch to the maximum.

Clogged oil circuit: The solution is to clean the oil circuit.

Ignition misalignment: The solution is to correct the ignition timing.

Damaged spark plug: The solution is to replace it with a new one.

Using poor-quality or deteriorated gasoline: The solution is to choose the correct grade of gasoline.

Clogged air filter: It can easily cause air intake difficulties and affect the start-up of the lawn mower. Therefore, the lawn mower should be frequently cleaned or have its air filter cleaner replaced, use qualified gasoline, and adjust the spark plug gap and engine.

Dull blade: If the trimming is uneven and lacks a smooth effect, it is usually due to a dull blade. Therefore, the blades of a lawn mower generally need to be ground once every ten days of use. For the blades of a roller cutter, the grinding frequency can be extended to once every three months.

Blade curling and deformation: During the lawn mowing process, hitting some hard objects can cause the blade to curl and deform, which may lead to vibration of the lawn mower. In addition, the situation where the blade is worn out to be top-heavy can also cause the lawn mower to shake. Therefore, the blades of the lawn mower should be ground to be horizontal on both sides. During use, pay attention to the condition of the lawn and try to avoid hard objects.

Clutch disc damage: When the brush cutter is working and lacks force to cut the grass, the clutch disc needs to be replaced.

Carburetor failure: If the muffler of the lawn mower engine is smoking, it may be caused by the excessive specific gravity of the intake combustion mixture. At this time, the air filter should be cleaned or replaced with a new one first. If the fault persists, the engine carburetor of the lawn mower needs to be cleaned and adjusted. Generally, it is only necessary to drain the excess oil and run it for another ten minutes. If the fault still exists at this point, it is necessary to call a maintenance person to inspect and repair the engine.

If the rope of the lawn mower rebounds when starting, it is mainly due to the early ignition time. In addition, it is also possible that the blade hit a hard object during the mowing process, cutting the flywheel key.

Fuel quality issue: Two-stroke lawn mowers use mixed oil (95% gasoline and 5% engine oil), while the other four-stroke lawn mower burns pure gasoline. For four-stroke lawn mowers, it is necessary to frequently check if the engine oil has decreased. If it has, it should be filled up to protect the lawn mower.