Why My Lawn Mower Won’t Accelerate? (Easy Fixes Included)

If your lawn mower is having trouble accelerating, it could be caused by a multitude of issues.

These include a clogged air filter, a faulty spark plug, a dirty carburetor, a worn drive belt, or even something as simple as stale fuel.

To determine the cause of the issue, it is important to first examine the mower and its components.

This article will provide an overview of the most common causes of slow acceleration in lawn mowers, as well as provide instructions on how to troubleshoot each one.

Why My Lawn Mower Won’t Accelerate?

There are a number of reasons why your lawn mower might not move even with accelerate.

Possible causes include a broken or clogged air filter, a broken or fouled spark plug, an inaccurate or broken governor, a clogged fuel line, or a problem with the carburetor.

Professional help may not always be necessary. You can take care of some of them on your own. Still, consult a specialist if that doesn’t help.

6 Reasons of Lawn Mower Not Accelerate (Fixes Added)

The following is a list of possible causes and solutions for why the lawn mower won’t accelerate

Clogged Fuel Line:

It’s possible that the fuel line is clogged up, which would explain why your lawn mower won’t speed up. The fuel line connects the tank to the carburetor so that fuel can flow between the two components.

If the fuel line is clogged, it will impede the flow of fuel, which will cause the engine to run more slowly or not at all.

The Fix

To determine whether or not the gasoline line has become clogged, you must first remove the fuel line from the carburetor and then blow into the line.

It is necessary to replace the gasoline line if it is obstructed to the point where air cannot move through.

Perhaps if the gasoline line is unobstructed, the carburetor still may require maintenance or even replacement.

Clogged Air Filter:

If the lawn mower won’t accelerate, it could be due to a clogged air filter. The air filter is designed to keep dirt and debris out of the engine, so a clogged air filter can cause the engine to run poorly and make the lawn mower difficult to accelerate.

The Fix

To check the air filter, first remove it from the lawn mower. Inspect the filter to see if it is clogged or dirty. If it is, replace the air filter with a new one. Make sure to use the correct air filter for your type of lawn mower.

Once the new air filter is in place, start the lawn mower and check the engine. If the lawn mower accelerates normally, the problem was likely due to a clogged air filter. If the lawn mower still won’t accelerate, you may need to look for other causes.

Related Post: Lawn Mower Leaking Oil From Air Filter: Here’s How to Fix It!

Dirty Spark Plug:

A dirty spark plug or a defective air filter is a possible reason of your lawnmower’s lack of acceleration.

An engine’s spark plug ignites the fuel, while an air filter keeps the air in the engine clean so that combustion may take place effectively. The power of an engine might be diminished if its spark plugs or air filter are unclean or clogged.

The Fix

Regular spark plug filter cleaning prevents this. Remove the air filter cover and air filter, then the spark plug filter, to clean the filter. Air or brush the spark plug filter.

Replace the air filter and cap after cleaning. Finally, start the mower to test acceleration.

A defective spark plug or carburetor may cause the mower to not accelerate. For diagnosis and repair, take the mower to a pro.

Related Post: 5 Lawn Mower Bad Spark Plug Symptoms to Look Out For!

Faulty Ignition Switch:

A malfunctioning ignition switch is another potential cause. To get the fuel and air mixture in the mower’s cylinder to burn, the ignition switch must deliver electricity to the spark plug.

If the ignition switch is broken, the spark will not reach the spark plug, and the engine will not start.

The Fix

First, remove the spark plug wire from the spark plug in order to test the ignition switch. Next, with the key in the “on” position, check the ignition switch’s two terminals with a continuity tester. If the continuity test fails, the switch is probably broken and has to be replaced.

Related Post: Lawn Mower Ignition Switch Problems and How to Fix Them

Worn Out Blades:

If the blades on your lawn mower are worn out, it is likely that your mower will not accelerate properly. This is because the worn-out blades cause a decrease in the amount of airflow created by the mower and thus the motor is not able to generate enough power to push the mower forward.

The Fix

To fix this issue, you will need to replace the blades on your lawn mower. Make sure to use the correct type and size of the blade for your particular mower.

Related Post: Lawn Mower Blades Won’t Engage Causes and Troubleshooting Steps!

Low Oil Level:

The lawn mower may fail to accelerate if there is not enough oil in the engine. The engine parts cannot move freely because there is not enough oil to lubricate them.

Too little oil in the engine can lead to overheating, which in turn reduces power and slows acceleration.

The Fix

Check the oil level is at the correct level and try the vehicle again. Use the recommended oil for your lawn mower and change it often to maintain it operating smoothly.

Faulty Carburetor:

If a lawn mower won’t accelerate, it could be due to a faulty carburetor. A carburetor is responsible for mixing air and fuel in the right proportions and sending it to the engine.

If the carburetor is faulty, then the engine will not get enough fuel and air, resulting in poor acceleration or even no acceleration at all.

The Fix

To diagnose and repair a faulty carburetor, it is best to take the lawn mower to a professional repair shop. A technician can then identify the fault and make the necessary repairs.

Common repairs include cleaning or replacing the carburetor, replacing worn or damaged parts, and adjusting the carburetor settings.

Related Post: 8 Common Lawn Mower Carburetor Problems (Fixes Included)

Frequently Asked Questions (FAQs)

Is it easy to maintain a lawn mower?

It is easy if you maintain your lawn mower routinely. You have to be patient and maintain the mower regularly as the manual instructed.

Why is my lawnmower slow?

Dirty air filters will slow your lawn. It can also cut engine power, weakening your lawn mower. Avoid operating your mower if the air filter is clogged.

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