When starting a lawn mower, especially after it has been sitting idle for a while, you may notice a small lever or knob marked with a choke symbol. This symbol plays an essential role in helping your mower’s engine start smoothly. But what exactly does the lawn mower choke symbol mean, and how do you use it properly?
In this guide, we’ll explain everything you need to know, from understanding the symbols to troubleshooting common choke-related issues.
Lawn Mower Choke Symbol
Most lawn mowers use symbols instead of words to indicate choke positions. These symbols can vary slightly depending on the manufacturer, but they generally follow the same pattern.
Here’s a breakdown of the most common lawn mower choke symbols you’ll encounter:
| Symbol | Description | Choke Position | When to Use |
|---|---|---|---|
| 🔵 Full Circle with Line or Filled-In Circle | Represents a closed choke | Choke ON | Use when starting a cold engine |
| ⚪ Open Circle or Half Circle | Represents an open choke | Choke OFF | Use after the engine has warmed up |
| 🌀 Line Between Open and Closed Symbols | Represents half-choke | Partial | Use briefly during warm-up in cold weather |
| 🟢 Rabbit or Fast Icon | Indicates fast throttle | Not the choke, but used with choke for starting | For warm start or quick acceleration |
| 🐢 Turtle Icon | Indicates slow throttle | Not the choke | Use when idling or shutting down |
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How to Use the Lawn Mower Choke
Using the choke correctly ensures that your mower starts efficiently and runs smoothly. Here’s how to do it step-by-step:
1. Locate the Choke Control
Look for the choke lever or knob. It’s often near the throttle or labeled with a choke symbol.
2. Set the Choke to ‘ON’ or Closed Position
Move the lever or knob toward the symbol showing a filled circle or the word “Choke.” This reduces air intake.
3. Start the Engine
Pull the starter cord or turn the ignition key. The engine should start after a few pulls.
4. Gradually Move Choke to ‘OFF’
Once the engine begins to run smoothly (usually after 30–60 seconds), slowly move the choke to the open position or symbol that looks like an open circle. This allows the engine to get more air and maintain stable performance.
5. Warm-Up and Mow
After adjusting the choke, let the mower run for a minute before engaging the blades and beginning to mow.
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Common Problems Related to Lawn Mower Choke
1. Engine Won’t Start Even with Choke ON
- Possible causes: Dirty air filter, old fuel, or clogged carburetor.
- Fix: Clean or replace the air filter, and use fresh fuel.
2. Engine Starts but Dies When Choke Is Off
- Indicates the carburetor is dirty or the fuel mixture is too lean.
- Fix: Clean the carburetor and check for fuel line blockages.
3. Black Smoke from Exhaust
- Means the choke is stuck closed, and too much fuel is entering.
- Fix: Inspect and adjust the choke linkage.
4. Automatic Choke Malfunction
- Some newer models have automatic chokes that fail to open.
- Fix: Check the choke spring and temperature sensor.
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How to Identify a Faulty Choke
If you notice difficulty in starting the mower, rough idle, or constant stalling, the choke might not be functioning correctly. To test it:
- Remove the air filter cover.
- Observe the choke plate while moving the control lever.
- When set to “Choke ON,” the plate should close almost entirely.
- When moved to “Run,” it should open fully.
- If it doesn’t move smoothly, the linkage may need cleaning or lubrication.
Manual vs Automatic Choke Systems
| Type | Operation | Pros | Cons |
|---|---|---|---|
| Manual Choke | User adjusts choke manually | Simple and reliable | Requires attention |
| Automatic Choke | Adjusts automatically using temperature sensor | Convenient and user-friendly | Harder to troubleshoot when it fails |
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Tips for Using the Lawn Mower Choke Efficiently
- Always turn the choke OFF once the engine warms up to avoid wasting fuel.
- Never force the choke lever, gentle movement prevents linkage damage.
- In very cold weather, you may need to keep the choke partially on longer.
- Regularly clean the air filter and carburetor for consistent choke performance.
Final words
Understanding the lawn mower choke symbol is key to ensuring smooth starts and efficient operation. Whether your mower uses a manual lever or an automatic system, knowing when and how to use the choke can prolong engine life and save you from frustration. Remember:
