What Is The Choke Position On A Lawn Mower ?

You may have noticed the red lever or button on your mower, which is called the choke valve. They are found in riding lawn mowers, circular mowers and many others. The choke can help keep you from having to purchase an entirely new mowers however how can this be feasible?

The lawn mowers choke decreases the flow of air in the engine, which allows the use of more fuel. This will allow the engine to ignite and spark more easily and start up quickly. Choke valves are only employed when absolutely necessary because they could damage the engine when they’re used for too long.

 This article talks about how a lawn mower choke can be useful? Including…

  • There are many reasons and motives to utilize a lawn mower’s choke valve
  • How to operate the mower choke
  • Quick solutions to issues with mower choke valves

Firstly, let’s consider the basic issue of starting an engine with choke.

  1. Close the choke, usually on a carburetor.
  2. If you have any throttle controls, set them to the START position or HIGH.
  3. Once or twice pull the starter cord (if it isn’t, the first one).
  4. If it doesn’t begin, close the choke halfway.

Where is Choke located?

The choke controls the amount of air entering the engine. It is located either on engines body or on the handle. Most choke valves can be found in the manifold, just above the carburetor jet.

Why choke is included in Lawn Mower?

The fuel used to power lawn mowers is either gasoline or electricity. Droplets of gasoline-powered equipment won’t evaporate when the temperature drops. The choke serves the following purpose:

  • This reduces air flow into the carburetor’s neck, which in turn lowers internal pressure, allowing more fuel to be pushed into combustion chambers.
  • The choke provides a richer fuel/air mixture to the engine for combustion. This allows it to continue running until the engine warms up enough to be able to run efficiently with an open choke. This is because the mower requires a rich-fuel-to-air mixture for cold start.
  • Provides higher vacuum that allows increase in fuel draw.
  • Helps in sustaining life span of lawn mowers.

How to control choke on a Lawn Mower?

Two types of system are used by manufacturers to ensure smooth cold starts. The choke plate system is controlled by a lever and the primer bulb, which is simpler and easier to use. Primer bulbs create a fuel-rich environment by injecting extra fuel into an engine.

This is how to use a lawnmower choke:

  1. Choose a good position to start your mower to prevent tall grass from catching the blade while you pull the start button. The throttle lever-type system uses full choke. If the primer bulb type is used, you can press the button three times.
  2. The bail bar, also called the dead man’s lever, is located at the top of handlebars. It is usually marked with a stop sign. This safety feature is used to stop the blade spinning and kill the engine within three seconds after activation of the bail lever.
  3. Pull the pull cord to allow the engine to produce a spark strong sufficient for the fuel.
  4. If your mower does not start after your first pull, wait for it to warm up. The engine could flood if it takes longer than three pulls. It should take approximately thirty minutes, but you can try it again without the choke.
  5. Once your engine is warm, turn the throttle lever to run/fast if you have a manual choke. Running warm engines with the choke on will cause black smoke, poor performance, and possibly even injury.

What happens if I leave the choke on?

Too long with the choke on will result in black smoke and sulking performance. It can also reduce the life expectancy of your lawn mower. The reasons might be..

  • Flooding– The ignition choke should be turned off after the engine is started. If not, it could lead to too much fuel entering the combustion chamber. The engine will then locks up and stall. Once the chamber is saturated, it can be difficult to drain the fuel from the chamber. You may have to open the engine to drain any fuel left behind. A wrong choke can cause flooding. For example, choke getting stuck in between and doesn’t close quickly.
  • Clogged carburetor: If your lawn mower suddenly stops working after the choke is turned on, this could be due to the fact that the fuel and air that are mixed in the proper ratio by the carburetor, aren’t functioning properly. The choke may not close or open correctly due to debris blocking fuel lines. Clean the carburetor and replace it in such case.

How to get over with such situations?

Solution for Flooding Problem:  Instead of pulling the cord on full choke, pull the cord until you feel the engine is about to start. If you feel the next pull of your cord will start the engine, move the lever to half-choke. This will allow air to enter the engine and reduce the chance of flooding.

Choke Opening and Closing solution: Ensure that the choke opens and closes properly, and check and lubricate both the choke shaft, and the choke linkage.

You can use the tools  and the cleaning agent spray suggested in the links for better cleaning experience.

Adjusting Choke Linkage:  You can fix this problem by loosening your cable mounting bracket as per the instructions in the equipment manual. To fix gaps or problems in movement, the choke lever can be removed and the cable casing can moved.

Final Verdict

Once you have tried it, lawn mower choke valves will prove to be very practical and simple to use. Although it may seem difficult, it is really just a simple lever or button.

To prevent flooding or smoking from your lawn mower, follow the step-by-step instructions.