The choke on a lawn mower is usually a lever, knob, or button located either on the engine (near the carburetor or air filter) or on the mower’s handlebar control panel. On many push mowers, it is a small lever on the side of the engine; on riding mowers, it may be a pull-knob or lever on the dashboard or near the throttle. Knowing exactly where to look will save you time on a cold morning and help you get the engine started without flooding it.
Understanding the Choke’s Function
Before you can find the choke, it helps to understand what it does. The choke restricts the amount of air entering the carburetor, which enriches the fuel mixture with a higher ratio of gasoline. This richer mixture is easier to ignite when the engine is cold, which is why the choke is primarily used for cold starts.
Once the engine warms up, the choke should be opened to allow normal airflow. If you leave the choke closed too long, the engine may flood, stall, or run roughly. Because the choke is a functional control rather than a decorative part, it is usually placed within easy reach of the operator—either on the engine itself or on the handlebar assembly.
The location matters because it affects how quickly you can engage and disengage the control. On most mowers, the choke is designed to be operated with one hand, often while the other hand holds the starter rope or ignition key. Understanding this functional context will help you identify the correct control even if it looks different from what you expected.
Common Choke Locations by Mower Type
The exact position of the choke varies by mower type, so it is helpful to know what to expect for your specific machine.
Push and Walk-Behind Mowers
On most push mowers, the choke is a small lever or slide located on the side of the engine housing, usually near the air filter or carburetor. It may be a metal or plastic lever that slides up and down, or a small knob that you pull out. On some models, the choke is integrated into the throttle control on the handlebar, appearing as a separate lever or a position on a combined control.
If your push mower has a primer bulb instead of a choke lever, it may not have a manual choke at all. The primer bulb serves a similar purpose by injecting a small amount of fuel directly into the carburetor, which is a common design on smaller engines.
Riding Mowers and Lawn Tractors
On riding mowers and lawn tractors, the choke is often a pull-knob located on the dashboard or instrument panel. It may be labeled with a symbol or the word “choke.” In some models, the choke is a lever mounted near the throttle control, often on the fender or steering column. You may need to pull the knob out or push a lever forward to engage the choke.
Some riding mowers have a combined throttle-choke control, where moving the lever to a specific position engages the choke. In this case, the choke position is usually marked with a symbol that looks like a butterfly or a closed valve.
Zero-Turn Mowers
Zero-turn mowers typically have the choke located on the control panel or near the ignition switch. It may be a small lever, a push-button, or a pull-knob. Because zero-turn mowers have a different control layout than traditional tractors, the choke is often placed within easy reach of the operator’s hand while seated. Check the area around the ignition key and the throttle levers first.
Identifying the Choke Control
If you are unsure which control is the choke, look for visual and functional clues. The choke is typically marked with a symbol that resembles a butterfly valve or a circle with a line through it, indicating the closed position. Some manufacturers label the control with the word “choke” or use a graphic showing a closed and open position.
The choke is often located near the throttle, but it is a separate control. The throttle adjusts engine speed, while the choke restricts airflow for starting. If your mower has a primer bulb, that is not the choke—it is a separate starting aid that works differently.
On many engines, the choke lever has two positions: closed (or on) and open (or off). The closed position is usually indicated by a symbol or a label, and it is the position you use for a cold start. Once the engine warms up, you move the lever to the open position to allow normal airflow.
If the control is not labeled, look for a lever or knob that moves in a way that would restrict airflow. A choke is typically a sliding lever or a pull-knob, while a throttle is usually a lever that moves smoothly to adjust speed. The choke often has a more defined “click” or detent at each end of its travel.
Precautions When Using the Choke
Using the choke correctly is important for both starting and engine health. The choke should be engaged only when the engine is cold. If the engine is warm or has been running recently, you generally do not need the choke at all.
Once the engine starts and runs for a short time—usually 30 seconds to a minute—you should open the choke. Leaving the choke closed too long can flood the engine with excess fuel, causing it to stall or run poorly. In some cases, a flooded engine may be difficult to restart and may require you to wait a few minutes before trying again.
If the engine does not start after a few pulls with the choke closed, do not keep pulling repeatedly. This can flood the engine. Instead, open the choke slightly and try again, or consult your owner’s manual for specific starting instructions for your model.
Always follow the manufacturer’s recommendations for your specific mower. Different engines may have slightly different starting procedures, and the owner’s manual is the most reliable source of information for your equipment.
If You Cannot Locate the Choke
If you cannot find a choke on your mower, there are a few possibilities. First, check the owner’s manual. The manual will include a diagram or description of all controls, including the choke, and it is the best resource for your specific model.
Some mowers do not have a manual choke. Newer engines may be equipped with an automatic choke that adjusts the air-fuel mixture automatically based on engine temperature. In this case, there is no control for you to operate—the engine handles the choke internally.
Other mowers use a primer bulb instead of a choke. The primer bulb is a small rubber button that you press a few times to inject fuel into the carburetor before starting. If your mower has a primer bulb, it likely does not have a separate choke control.
If you have checked the manual and still cannot find the choke, look for a small lever or knob near the carburetor or air filter that you may have overlooked. In some cases, the choke is located on the engine itself rather than on the handlebar or dashboard. If you are still unsure, a small-engine repair shop or the manufacturer’s customer service line can help you identify the control on your specific model.
Remember that the choke is a simple mechanical control on most mowers. Once you know where to look, it is usually easy to identify and use. With a little practice, starting your mower on a cold morning will become a quick and straightforward process.
