Briggs and Stratton Throttle Linkage Diagram (2023)

The Briggs and Stratton throttle linkage diagram serves as a visual aid in unraveling the intricacies of your lawnmower’s throttle system.

If you have any problem with the throttle system, you will need to have a look at the throttle linkage diagram to figure out what went wrong.

Do you find it too confusing? No worries, I am here to help! 

Briggs and Stratton Throttle Linkage Diagram: Breaking Down

In simple terms, a throttle linkage diagram is a picture that helps us understand how the throttle system in an engine is put together.

It shows us all the important parts like linkages, rods, levers, springs, and more, and how they connect to control the throttle’s motion. It’s like peering into the engine’s soul and discovering the magic behind its power and performance.

The throttle linkage diagram provides a clear visual representation of how the components in the engine’s throttle system are organized and linked together. It illustrates how these parts work in tandem to regulate the flow of air and fuel into the engine. 

Additionally, the diagram demonstrates how the throttle plate acts as a gatekeeper, controlling the airflow into the engine.

briggs and stratton throttle linkage diagram
Source: Inside Yard

It also shows how the governor closely monitors the engine’s workload and makes adjustments to the throttle position accordingly. Here are the parts you would see in a Briggs and Stratton throttle linkage diagram:

Throttle Lever

The throttle lever in a lawnmower is a control mechanism that lets the operator adjust how fast the engine runs. It’s usually located on the lawnmower’s handle or control panel for easy access.

The lever controls the amount of air and fuel mixture going into the engine, which directly affects the engine’s speed and power output.

When the lever is pushed forward or raised, it opens the throttle, allowing more air and fuel to enter the engine. This increases the engine’s speed and gives it more cutting power.

On the other hand, pulling the lever back or lowering it restricts the airflow, reducing the engine’s speed and power.

By using the throttle lever, the operator can customize the lawnmower’s performance based on factors like grass height, terrain, or personal preference.

It helps achieve efficient fuel usage, optimal cutting performance, and the ability to adapt to different mowing conditions.

Throttle Plate

The throttle plate in a lawnmower is an important part of the carburetor or throttle body. It’s a flat, circular, or semi-circular plate that you can find inside the intake manifold or air intake passage.

Its main job is to control the flow of air that enters the engine. But, isn’t that what I just told you about the throttle lever? Let me explain. 

When you adjust the throttle lever or accelerator, it causes the throttle plate to move. When the throttle plate is fully open, it allows more air to flow into the engine, which increases the engine’s speed and power.

Conversely, closing the throttle plate restricts the airflow, reducing the engine’s speed and power.


The governor controls and stabilizes the engine’s speed, according to the grass thickness, cutting conditions, and load on the cutting blades.

Its main purpose is to keep the engine running at the best speed for efficient and effective mowing. Even when the grass gets thicker or the load on the engine changes, the governor steps in to provide stability. 

The governor helps the lawnmower deliver consistent cutting performance. It ensures that the engine doesn’t work too hard or too fast, preventing damage and ensuring efficient fuel consumption.

In simple terms, the governor acts like a “speed controller” for the lawnmower engine, making sure it runs smoothly and efficiently regardless of the mowing conditions.

Linkage Rods

Throttle linkage rods in a lawnmower are rods that connect the throttle lever or accelerator to the throttle plate or butterfly valve in the carburetor. They serve as a link between the operator’s control and the engine’s throttle system.

When the operator adjusts the throttle lever or presses the accelerator, these linkage rods transmit that movement to the throttle plate or butterfly valve. This action regulates the amount of air and fuel entering the engine, which directly affects the engine’s speed and power.

One end of the rods is linked to the throttle lever or accelerator mechanism, while the other end is attached to the throttle plate or butterfly valve.

When the operator makes adjustments to the throttle lever, the input transmits to the throttle plate through the linkage rods. As a result, the throttle plate responds by either opening or closing.

How Do You Adjust A Briggs And Stratton Throttle Link?

Step 1. Remove The Air Cleaner

Take off the air cleaner. Keep the air cleaner and screws in a secure location. Be aware that certain Briggs and Stratton models feature air cleaners secured with a wing-nut instead of screws.

Step 2. Locate The Choke Lever

Carefully check the engine to locate its choke lever, also referred to as the choke arm. This small arm, made of either metal or plastic, is responsible for regulating the throttle’s operation in response to adjustments made to the throttle lever on the machine’s handle.

Keep an eye out for a small spring that is usually connected to the arm. If you’re unable to locate the choke lever on the engine, inspect the remote engine speed controls as it might be located there.

Step 3. Adjust The Throttle Lever

Position the throttle lever to the “Fast” or “High” setting. Use a flat-head screwdriver to loosen the screw that holds the mounting bracket responsible for supporting the cable.

Loosen it to an extent that allows for unobstructed movement of the cable through the support.

Step 4. Adjust The Throttle Cable

Make adjustments to the throttle cable until the throttle reaches the closed position. Firmly tighten the bracket mounting screw to lock in the newly made adjustment.

Proceed to test the throttle lever at various positions to ensure that the throttle link accurately regulates the throttle based on the chosen settings.

Step 5. Put Back The Air Cleaner

Follow the instructions from Briggs and Stratton and reinstall the air cleaner by securely screwing it back into position.

Frequently Asked Questions

How often should I check and adjust the throttle linkage?

It is recommended to check and adjust the throttle linkage at the beginning of each mowing season or after any maintenance that involves the engine’s carburetor or throttle system. Regular inspections help ensure proper engine performance and prevent potential issues.

What are the signs of a faulty throttle linkage?

A faulty throttle linkage can manifest in various ways. Some common signs include erratic engine speed, difficulty starting, engine surging, or a lack of power. If you experience any of these issues, it is advisable to inspect and troubleshoot the throttle linkage.

Can a damaged throttle linkage affect engine performance?

Yes, a damaged or improperly adjusted throttle linkage can significantly impact engine performance. It can result in poor acceleration, decreased power output, or even engine stalling. Regular maintenance and proper adjustment of the throttle linkage are essential for optimal engine operation.

Final Words

The Briggs and Stratton throttle linkage diagram serves as a comprehensive guide to the inner workings of the throttle system.

It allows users to identify the various linkages, rods, levers, springs, and other components involved in controlling the engine’s speed and power output. So, it will help you diagnose and troubleshoot throttle-related problems.

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