Home / How To Guide / Lawn Mower Is Bogging Down – Why? How To Fix?

Lawn Mower Is Bogging Down – Why? How To Fix?

A mower bogging down is considered as an issue that arises when cutting grass, in a yard or on a plantation where one has grown grass for commercial purposes.

While it often looks serious, the solution is usually quite easy.

It might only need minor repairs, specific maintenance criteria, and ensuring the proper ways of using the lawnmower.


Many people have experienced bogging down, especially when going uphill.

Most of the time, a mower can bog down if it has issues with the power system of the engine, whereby the blades flop to cut the grass.

Below Are Some Causes And Solutions To Bogging Down;

1. The Engine May Have Overheated.

This is mainly as a result of grass clippings which are formed during the mowing process as they may lodge between the cooling fins that are found in combustion engines.

The lodging of the dust and grass clippings causes an obstruction and prevents generated warmth evasion of engines.

This leads to the engine becoming too hot and hence overheating thus has a problem working as required.

Due to the strain, it undergoes while pushing through the grass, it bogs down and might even die.

How To Fix It?

  • The mower should be allowed to cool, although the problem might arise again after a few minutes of mowing.
  • Repairs and replacements of the engine to deal with the bogging down effectively, such as giving the plastic shroud that covers the engine top a thorough cleaning as this will help in the removal of the debris trapped during mowing.

2. Air Leakages.

The right mixture of air and gasoline is essential for a small engine to run smoothly.

The motor sometimes depicts massive interference with fuel fusion amounts, causing bogging down of the mower.

These air leaks are caused by small gaps between components and are known to widen up as the mower moves, and engines get heated up.

How To Fix It?

  • Tightening of the bolts that hold on the carburetor in place and not forgetting bolts that hold together the motor. This will make sure that the mower runs without any developing problems due to air leakages or loose bolts.

3. The Spark Plug May Have Problems.

Spark plugs are known to happen in instances in which it is firing electrodes.

These two electrodes must have a gap set between them so that the spark can burn the fusion to motorize the mower.

Bogging down occurs when the gap is too wide; thus, a lawnmower loses its efficiency and effectiveness.

A damaged plug may also be another cause of this spark plug problem.

Long mowing hours, which cause carbon build-up, is yet another reason.

How To Fix It?

  • The wide gap can be reset and adjusted to the right sizes, which do not interfere with air and gasoline mixtures.
  • The damaged plugs must be replaced as soon as possible.
  • Cleaning of the carbon fouled spark plugs, which reduces the effect of heating up of the lawnmower.

4. The Engine May Have Compression Issues.

As it is well known, engines have valves that need clearances once in a while.

This process requires highly trained persons or deep experiences in engines and engine repairs.

The valves are expected to close tightly, which enables the mower to operate well.

The valves open, and this prevents the cases of bogging down from happening.

How To Fix It?

  • Adjust and repair the internal components of the engine, such as the valves. This is highly recommended that one consults some experienced or trained persons specialized in small-engine repair for the services.
  • Otherwise, one can also carry out the whole repair activity by first dismantling the motor system and examine its parts. Then making the proper adjustments, such as ensuring the valves face the right direction.

5. Problems On The Carburetors Sticky Choke

A lawnmower consists of a carburetor that has many components.

The use of a sticky-choke is providing the engine with a gasoline mixture to start it up.

However, there are some guidelines on how the choke operates.

If the choke sticks shut, this will lead to the engine running poorly due to bogging down and hence has to be controlled.

How To Fix?

  • Cleaning the choke manually and its linkages is also another possible way of freeing up the carburetor.
  • Replacing of the choke is also essential for proper carburetor operation if all the other ways fail.

6. Mowing On A Hilly Area May Be An Issue.

Hilly areas are usually associated with bumpiness, which is true.

Mowers sometimes tend to hesitate or die when one hits a bump. For example, on a hard and bumpy yard, this could be a possible reason for bogging to occur.

This may not be faced when mowing on level ground as it is on the counterpart uphill or slopes.

How To Fix?

  • In such areas, one can mow the yard on the highest setting. The sharpening of the blade is also ideal and thus advised.
  • Mowing on the areas that your lawnmower is capable of since one cannot go beyond the capacity of the mower.

7. Cutting Thick Grass May Also Cause A Mower To Bog Down.

For a relatively old lawnmower, some rough times are expected while running it.

However, for a newly purchased mower, a smooth run during the operation should be seen.

Excessive dirt and grass can clog the air filter system or the cooling fins, which will lead to power loss and hence bogging down of the mower under load.

The fuel system also gets clogged with excessive dirt.

How To Fix?

  • Replace the old fuel with new fuel by cleaning off the carburetor and changing gas.
  • Clear all the dirt from the cooling fins.
  • Replace the fuel filter with a new one to have free-flowing fuel in the carburetor.


As much as these bogging down problems may occur, the solutions exceed the challenges, and thus proper maintenance of mowers and constantly checking them will keep mowers in excellent conditions even during mowing.

In the case of total failure, however, calling a professional to solve it would be the right step.