You’re out there, ready to tackle your overgrown lawn, and your Briggs & Stratton lawn mower suddenly sputters and stalls. You check the gas, you check the spark plug, but the culprit seems to be the throttle. Maybe it’s not responding, or maybe it’s stuck wide open, leaving you with a runaway lawnmower. Don’t panic! This article will guide you through the process of adjusting your Briggs & Stratton lawn mower throttle, helping you get your mowing done efficiently and safely. We’ll cover how to identify the throttle linkage, explain the different types of throttle systems, and walk you through the adjustment process, step by step.
A Quick Overview of Throttle Adjustment
The throttle on a Briggs & Stratton lawnmower controls the amount of fuel that gets delivered to the engine. By adjusting the throttle, you can control the engine speed and therefore the cutting speed of your mower. While some adjustments might seem minor, they can significantly affect the performance of your mower.
Understanding the Throttle Linkage
Before we dive into the specifics of throttle adjustment, it’s important to understand the basic components of the throttle linkage. This linkage is what connects the throttle control on your mower’s handle to the carburetor.
Identifying the Throttle Linkage
- Throttle Control: This is the lever or knob on your mower’s handle that you use to control the engine speed.
- Throttle Cable: A flexible wire or cable that runs from the throttle control to the carburetor.
- Throttle Lever: This is a small lever on the carburetor that is directly connected to the throttle cable.
Types of Throttle Systems
Briggs & Stratton lawn mowers use several different throttle systems, each with its own unique adjustment procedure. Here are some of the most common:
1. Cable-Operated Throttle
- This is the most common type of throttle system, and it’s relatively simple to adjust. The throttle cable is attached to the throttle lever on the carburetor. Adjusting the throttle involves adjusting the tension of the cable.
2. Governor-Controlled Throttle
- This type of system uses a governor to automatically control the engine speed. The governor monitors the engine’s RPMs and adjusts the throttle to keep the engine running at a consistent speed. Adjusting the governor is typically not recommended for home users and requires professional attention.
3. Spring-Loaded Throttle
- This type of system uses a spring to return the throttle to its idle position. Adjusting this system involves adjusting the spring tension.
How to Adjust Your Briggs & Stratton Lawn Mower Throttle
Now that you have a basic understanding of the components and types of throttle systems, let’s get into the specifics of adjusting your throttle.
Important Note: Always consult your Briggs & Stratton lawnmower manual for specific instructions and safety precautions.
General Steps for Adjusting the Throttle
- Safety First: Make sure your lawnmower is completely off, the spark plug wire is disconnected, and the fuel valve is shut off.
- Locate the Throttle Adjustment: Locate the throttle cable adjustment on your mower. It’s usually found near the carburetor or on the throttle cable itself.
- Locate the Throttle Lever: Find the throttle lever on the carburetor. This is what the throttle cable is connected to.
- Adjust the Cable Tension:
- Loosening the cable: Turning the adjustment screw clockwise will tighten the cable, which will increase the engine speed.
- Tightening the cable: Turning the adjustment screw counterclockwise will loosen the cable, which will decrease the engine speed.
- Test the Throttle: After each adjustment, reconnect the spark plug wire, start the engine, and test the throttle to see if the engine speed responds appropriately.
- Repeat if Necessary: Continue adjusting the cable tension until the engine runs at the desired speed.
Specific Adjustment Procedures
Depending on your specific Briggs & Stratton model, there may be slightly different procedures for adjusting the throttle. Consult your manual for detailed instructions.
Cable-Operated Throttle Adjustment
- Locate the adjustment screw on the throttle cable near the carburetor.
- Turn the adjustment screw clockwise to increase engine speed or counterclockwise to decrease engine speed.
Spring-Loaded Throttle Adjustment
- Locate the spring adjustment screw on the carburetor.
- Turn the screw clockwise to increase the spring tension and increase the engine speed, or counterclockwise to decrease the spring tension and decrease the engine speed.
Troubleshooting Tips for Throttle Problems
If you’re still experiencing problems with your throttle, here are some troubleshooting tips:
1. Check for a Broken or Damaged Throttle Cable
- The throttle cable can break or become damaged over time, especially if it’s been exposed to heat or moisture. Inspect the cable for any signs of wear or damage.
2. Make Sure the Throttle Lever is Moving Freely
- The throttle lever on the carburetor should move freely without any binding or resistance. Check for any debris or obstructions that may be hindering its movement.
3. Examine the Carburetor
- The carburetor can become clogged with debris or dirt, which can affect the throttle response. Clean the carburetor according to your mower’s manual.
4. Check the Governor
- If your lawnmower has a governor-controlled throttle, the governor may need adjustment or repair. Consult a professional for assistance.
5. Consider the Air Filter
- A dirty air filter can restrict airflow to the engine, affecting performance and throttle response. Replace the air filter regularly.
Conclusion
Adjusting the throttle on your Briggs & Stratton lawnmower can be a simple fix for a variety of performance issues. By following the steps outlined in this article, you can troubleshoot throttle problems and restore your mower to its optimal performance. Remember to always consult your owner’s manual for specific instructions and safety precautions. With a little time and effort, you can have your mower running smoothly again in no time.
Frequently Asked Questions
Q1: Why would I need to adjust the throttle on my Briggs & Stratton lawnmower?
A: You might need to adjust the throttle on your Briggs & Stratton lawnmower if you notice it’s running too fast or too slow, or if it’s having trouble starting. A properly adjusted throttle will ensure the engine runs at the optimal speed for your mowing needs. If the engine is running too fast, it can lead to excessive fuel consumption and wear on the engine. If the engine is running too slow, it can cause the mower to bog down or stall.
Q2: What tools do I need to adjust the throttle?
A: To adjust the throttle on your Briggs & Stratton lawnmower, you will only need a few basic tools. You’ll need a Phillips screwdriver, a flathead screwdriver, and a wrench that fits the throttle cable nut. It’s also a good idea to have a rag on hand to clean up any spilled fuel or oil.
Q3: Where is the throttle control located on my lawnmower?
A: The throttle control on your Briggs & Stratton lawnmower is typically located on the handle. It may be a lever, a knob, or a button. The exact location will vary depending on the model of your lawnmower.
Q4: What is the proper way to adjust the throttle?
A: To adjust the throttle on your Briggs & Stratton lawnmower, you will need to access the throttle cable adjustment nut, which is located on the carburetor. Loosen the nut, turn the throttle control to the desired speed, and then tighten the nut. You will likely need to test the engine and make further adjustments until you reach the desired speed.
Q5: How do I know if the throttle is properly adjusted?
A: You will know the throttle is properly adjusted when the engine runs at the desired speed, without bogging down or stalling. You can also check the engine’s RPMs with a tachometer to ensure they are within the manufacturer’s recommended range.
Q6: What safety precautions should I take when adjusting the throttle?
A: Before adjusting the throttle on your Briggs & Stratton lawnmower, always disconnect the spark plug wire to prevent the engine from starting accidentally. Also, be sure to wear safety glasses and gloves to protect yourself from any potential hazards. Additionally, work in a well-ventilated area to avoid inhaling fumes.
Q7: What should I do if I can’t adjust the throttle myself?
A: If you are unable to adjust the throttle yourself, you can take your lawnmower to a qualified repair shop. They will have the tools and expertise to properly adjust the throttle and ensure it is running safely and efficiently.