Briggs And Stratton Carburetor Diagram (A Visual Guide)

The carburetor is the unsung hero of an engine that oversees fuel delivery and air regulation. If your lawn mower has a Briggs and Stratton engine and the machine is consuming more fuel, emitting black smoke, and facing engine stalling issues regularly, you should consider checking the carburetor.

My Briggs And Stratton carburetor diagram breakdown should help you out. 

Briggs And Stratton Carburetor Parts Diagram

Briggs And Stratton Parts Carburetor Diagram
Source: Briggs And Stratton User Manual

A carburetor parts diagram is a schematic diagram that details the position of internal carburetor components. Its main purpose is to provide educational support and help users become familiar with how a carburetor functions.

A thorough study of the diagram can help the reader easily identify different parts and make them understand their roles.

Gasket Intake (51, 51A)

The gasket intake, which sits between the carburetor and the intake manifold, functions as a seal to block any potential air or fuel leaks.

It creates a tight barrier between these two parts to maintain the integrity of the system and prevents any disruptions in the air-fuel mixture. If the gaskets are compromised, the air-fuel balance will get disrupted. 

Spacer Carburetor (122)

The spacer carburetor, aka the carb spacer, is another component that occupies the intermediate space between the carburetor and the intake manifold.

The fundamental objective of a spacer carburetor is to modify the airflow dynamics within the engine, allowing for increased efficiency and power output.

Gasket Air Cleaner (163)

The gasket air cleaner is a seal that you can find between the air cleaner housing and the carburetor within a Briggs And Stratton engine.

It facilitates an airtight enclosure to effectively keep out unfiltered air and pollutants. A fully functioning gasket air cleaner is instrumental in extending the lifespan of an engine and maintaining optimal performance. 

Lever Choke (951)

The choke, as the name implies, restricts airflow into the carburetor. What happens when the air volume drops?

It allows for a richer air-fuel mixture, which in turn, creates the ideal conditions for combustion to take place inside the engine. You can regulate airflow through the choke with a lever. 

Drain Carburetor Bowl (254)

The drain carburetor bowl is the lowermost component of the carburetor that serves as a fuel reservoir. It stores the fuel until it comes in contact with air and reaches the engine.

It also filters out impurities from the fuel and maintains desirable fuel quality to maximize engine performance. I would recommend you clean this often. 

Main Jet (117, 118)

The main jet is responsible for regulating the amount of fuel that mixes with the air. It’s located in the main carburetor body, just below the main fuel circuit.

The main jet lets in the amount of oil that is needed to meet the combustion demand of an engine at a certain point. Malfunctioning main jets lead to fuel inefficiency. 

Stud (53)

A stud is a threaded bolt that works as a mounting platform for other carburetor components. It comes threaded on both ends for stable placement inside the carburetor.

For example, it can be used to attach an air cleaner assembly onto the carburetor or a fuel bowl to the main body of the carburetor.

Nut (654)

Nuts are used to establish a secure connection between the carburetor parts and attach other components to the carburetor body.

The internal threading on carburetor nuts allows them to connect to studs and bolts. Briggs And Stratton use nuts that can withstand expected engine temperature range and vibration.

Pin Float Hinge (104B)

A pin float hinge is a dedicated mechanism that acts as the link between the float and the float bowl, ensuring the smooth movement of the float.

The float rises and falls to indicate changes in the fuel level. When the fuel level increases, the float moves upward and eventually shuts off the inlet valve to prevent the fuel from overflowing.

Kit Carb Overhaul (121B)

The kit carb overhaul is a repair kit that comes with the necessary tools and accessory parts to fix a carburetor.

The Briggs and Stratton kit carb overhaul packs a pair of gasket intakes, a pin float hinge, and a gasket air cleaner. In some cases, you might have to order some extra items to complete your maintenance work. 

How To Find The Model Number On A Briggs And Stratton Carburetor?

Briggs And Stratton have a wide range of products, so it would be easier to order maintenance and service parts if you know the model number of a Briggs And Stratton carburetor.

Other than knowing the model number, it’s impossible to determine which one is the right repair kit for your carburetor. 

Briggs And Stratton emboss the product information on a metal plate for better readability. In lawnmowers, you will find the information etched on the muffler. The first series of numerals represents the model, the second series of numerals show the type, and the final series is the product code. 

In pressure washers, you will have to look at the side of the metal overhead valve cover. Take off the hose and you will find the product information under the muffler.

It’s easier to find these numbers on generators as they are printed on the side of the OHV cover. In most cases, you will not need any extra tools to access the numbers. 

Some products might have decorative engine covers. In that case, you will have to take off the cover by undoing the bolts and taking a look at the engine casing.

The numbers are usually printed on areas that are easy to see, so it should not take long to find the information. 

Final Words

Understanding the Briggs and Stratton carburetor diagram is a must for the effective maintenance of a Briggs and Stratton carburetor.

The carburetor assembly might differ from manufacturer to manufacturer, so even if you have experience working on other carburetors, I would recommend going through this article before attempting to repair a Briggs and Stratton unit.

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