Lawn Mower Only Runs On Choke – Quick Fix In A Few Minutes

Lawn Mower Only Runs On Choke. Do you have a hard time keeping your lawn mower running? Will it only run on full choke?

If Lawn Mower only runs on a choke, it means there is too much air or insufficient fuel in the carburetor. Dirty and old gas causes problems in the Lawn mower’s carburetor due to its changed chemical composition.

Moreover, a leak in the air system, a faulty spark plug, and a bad fuel system restricting fuel flow also lead to an engine only running on choke. Running a Lawn mower on a full choke can cause severe damage to the engine and needs urgent repair.

Now that you completely understand why your lawn mower will only run on choke, how can you fix it?

Continue reading to discover everything you need to do to get your Lawn mower up and blowing snow again.

Lawn Mower Only Runs On Choke

The leaves are falling and the snow is on its way, which means it’s time to get your Lawn Mower out of the garage and get ready for action. But what if you had just done this exercise to find out that your Lawn mower only runs on choke?

Of course, the first thing you think will be: Why is this happening and what can you do to fix it?

Don’t worry. This is a common problem with Lawn mower engines, and it can be frustrating if you’re not sure what to do. But the good news is that there are a few things you can do to get your Lawn mower running smoothly again.

In this article, we’ll give you some tips on how to troubleshoot a Lawn mower that only runs on full choke. We’ll also share some information on how to prevent this problem from happening in the future.

But first, we will assume you want to know about carburetors and choke and their function on the Lawn Mower. Skip this part if you want to fix the problem quickly.

What Is Carburetor

A carburetor is an essential component in an internal combustion engine. It is responsible for mixing fuel and air in the right proportions and supplying the mixture to the engine.

In fact, the carburetor regulates the amount of air and fuel mixed together, which affects the speed and power of the engine. The carb also helps to control the engine’s idle speed.

What is a Choke and how its function on the engine?

Like all small engines, a choke is a valve in the Lawn Mowerto that restricts the airflow into an engine in order to make it easier to start.

When the engine is cold, the choke is used to partially or fully block the flow of air. This increases the fuel concentration in the combustion chamber thus leading to a quick and easy engine start-up.

This is designed especially for cold conditions when your small engine won’t start easily. Once the engine is warm, the choke is no longer needed and can be turned off.

Ariens Lawn Mower Won’t Stay Running: Causes and Solutions

If your Lawn Mower engine won’t start or won’t stay running when you pull off the choke, there are several reasons and causes.

Blocked Carburetor

A blocked carburetor can result in the use of a choke in a Lawn Mower to immediately start it. As the carburetor is responsible for mixing the air and fuel in the engine if it gets blocked, it can cause the engine to run lean or don’t run at all, meaning that there is not enough fuel being mixed with the air.

This can cause the engine to stall, and the Ariens Lawn Mower will need to be choked to get it started again. But choking is not the best option all the time, you should clean the carb. Before going to clean this thing, it is important to know why the carb gets blocked.

A carburetor can become blocked for a number of reasons.

They typically get blocked due to old or stale gas, which reduces the carburetor efficiency and causes engine problems.

When gas sits for too long, it begins to break down and form deposits on the carburetor. This old gas can become stale and turn into varnish, which can also clog up the carburetor’s jets and passages.

If there is somehow water in the gas, it can also cause deposits to form.

Moreover, moisture can condense in the carburetor, which can lead to rust and corrosion.

Note: Gas is considered damaging for caburetor and engine if it is more than 5-6 months old. Therefore, never use old gas in your small engines, if you dont want your machines to end up running on just choke.

Another common reason maybe is if the Lawn Mower is left outside in the cold for an extended period of time. The cold weather can cause the carburetor to freeze, which can then block the fuel line and prevent the Lawn Mower from starting.

Another reason a carb can become blocked is if there is debris in the fuel line. This can happen if the fuel is of low quality, or the fuel line is not cleaned regularly. The debris can clog the carb and prevent the Lawn Mower from starting.

How To Clean A Clogged Carburetor On Lawn Mower

Cleaning a carb without removing it can be difficult, but it is possible with the proper tools and techniques. Here, we will give you a step-by-step guide on how to clean a carburetor without removing it. First, you will need to gather the following supplies:

  1. A carburetor cleaner
  2. A wire brush
  3. Pointy nose pliers
  4. A set of sockets and wrenches
  5. A rag

Once you have gathered the necessary supplies, follow these steps to clean your carburetor:

1. Disable the engine: To disable the engine, disconnect the negative battery terminal.

2. Remove the air filter: Locate the air filter housing and remove the cover. Then, remove the filter itself.

3. Spray carburetor cleaner: Next, spray carburetor cleaner into the carburetor throat. Be sure to coat all of the parts well.

4. Allow the cleaner to soak: Allow the cleaner to soak for 10-15 minutes.

5. Scrub the carburetor: Use the wire brush to scrub the carburetor clean. Pay special attention to the jets and passages.

6. Reassemble and test the Lawn Mower: Once everything is clean, reassemble the air filter housing and reconnect the negative battery terminal. Start the Ariens engine and test it out. If it runs smoothly, you have done a great job!

However, if Ariens is still not running instead on a full choke, you have to disembark the carb and clean it thoroughly. 

Tips to Prevent Carburetor Blockage

How To Avoid a Blocked Carburetor? A blocked carburetor can be a serious problem for any engine, especially a Lawn Mower, and it is important to know how to avoid this problem. There are a few things you can do to avoid a blocked carburetor.

  • First, make sure you regularly clean your engine. This will help to remove any build-up of dirt or debris that could eventually lead to a blockage.
  • Second, be sure to use fresh fuel. Old fuel can oftentimes be the cause of carburetor issues.
  • And finally, if you’re not using your engine for a while, be sure to cover it up to protect it from the elements.
Other Keypoints:

Don’t Use older Gas in Lawn Mower – not more than 5 months old fuel.

FAQs – Lawn Mower Only Runs On Choke

What happens if you run a lawn mower with the choke on?

If you run a lawn mower with the choke on, the engine will run hotter than normal and may eventually overheat. The choke is a device that restricts the flow of air to the engine, and it is only meant to be used for starting the engine. Once the engine is running, the choke should be turned off so that the engine can operate at its normal temperature.

If you keep the choke on for too long, the engine will start to smoke and may eventually catch fire. So it’s important to only use the choke when starting the engine, and then to turn it off as soon as the engine is running smoothly.

Why does my lawnmower start but not stay running?

There are a few reasons why your lawnmower might start but not stay running.

  1. One possibility is that the spark plug is not firing correctly. This can be caused by a number of things, such as a dirty spark plug or a problem with the ignition system.
  2. Another possibility is that the carburetor is not getting enough fuel. This can be caused by a clogged fuel filter or a dirty carburetor.
  3. If your lawnmower is having this problem, it’s best to take it to a qualified repair person to diagnose and fix the problem. Trying to fix it yourself can be dangerous, and you could end up making the problem worse.

Why does my lawn mower only run for a few seconds and then die?

If your lawn mower starts and then stalls after only a few seconds, there are a few potential causes.

The most common cause is that the mower’s carburetor is flooding. This can happen if the carburetor bowls have too much fuel in them or if the float needle is stuck in the “open” position.

Other potential causes include a damaged spark plug, a clogged air filter, or a problem with the mower’s gas tank.

If you’re not sure what’s causing the problem, it’s best to take the mower to a professional for diagnosis and repair.


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