Briggs and stratton carburetor location

Briggs and stratton carburetor location DEFAULT

Mower engines are quite compact, locating components can be difficult, not to worry, this guide will clearly identify your carburetor, fill you in on what it does, and the fastest way to find it. I also share a top mechanics tip to prevent the common carburetor problems. (Gumming)

A mower carburetor is located behind the air filter on the side of the engine, opposite side to the muffler.

In this post, you’ll learn how to locate and identify your lawn mower carburetor and your mower air filter.

Identifying The Mower Air Filter

A mower carburetor lives behind the air filter and is often hidden from view. So first we’ll locate the air filter, finding the air filter means we found the carburetor, make sense? The air filter is positioned to one side of the engine, makes and models differ as to which side. But no matter what engine or model, they all tend to use a black plastic air filter cover. Once you’ve located the cover, finding the carburetor is a ton easier.

Most mower’s air filter covers are rectangle in shape and employ easy tools less access for on-the-fly air filter cleaning. A regular type of carburetor lives behind the air filter housing and is identified by its shiny metal bowl shape, but we’ll look at carburetors a little later. For now, check out these pictures and try to identify the air filter cover.

What Does A Mower Carburetor Look Like?

Most carburetors look very similar, with small metal components with levers and springs and the characteristic bowl shape under the carburetor body.

Carburetor – Standard carburetor type with the bowl.

If you had a carburetor in your hand you’d notice an opening front and back, that’s where air enters the carburetor and is forced through the venturi, drawing fuel from the bowl as it travels onto the combustion chamber. What I have described are the standard and most common type of carburetor, but not all carbs look like this.

Briggs & Stratton carburetor and tank assembly – A common Briggs and Stratton carburetor fitted to the Classic and Quantum engines, it’s a plastic carb and metal gas tank assembly.

This type of carburetor is somewhat similar, as it lives under the air filter and employs levers and springs to control engine rpm. However, it doesn’t use a conventional gas bowl, instead of the gas tank assembly and carburetor work together to perform all the functions of a carburetor.

New Type Plastic Carburetors – It’s worth noting the latest carburetor types are plastic, they still live behind the air filter housing and employ levers and springs and a gas bowl. However, the bowl may not be as pronounced as the traditional bowl.

Common Carburetor Problems & Fixes

Carburetors although small and insignificant looking are in fact very sophisticated and crucial to your mower engine performance. A mower engine requires a mixture of fuel and air in order to run. The ratio of fuel to air also known as the AFR (air-fuel ratio) is 14.7 to 1 (written 14.7:1).

The carburetor is tasked with maintaining this ratio, and that’s no easy task. Fuel demands change as the engine cuts grass or idles or traverses up a steep hill, the carburetor needs to make adjustments immediately.

If the carb supplies too little gas to the mix, the engine loses power and/or dies. If on the other hand, the carb supplies too much gas to the mix, the engine stumbles, blows black smoke, and operates at reduced power. When the ratio is off, it may be the fault of the carburetor, however many times it’s not.

A blocked air filter will prevent enough fresh air from reaching the carburetor, this often results in black smoke and poor performance. A common fix for many carburetor problems is gas bowl draining, it’s easy to do and for many fixes, there is a poor running, mower. Check out draining the gas bowl video here.

Blocked Jet

A blocked fuel line or fuel filter will prevent enough gas from reaching the mower. However, the most common type of carburetor issue is contaminated gas (old, dirty, or water in the gas). The next most common carburetor problem is dirt in the fuel jet and emulsion tube.

The jets and tube are tasked with metering the fuel through small holes, as you can imagine when these holes are obstructed, the ratio is off. The most common repair I make to mowers in a season is carburetor cleaning.


Old gas gums up the carburetor and causes a ton of easily preventable problems. I replace a ton of carburetors. Gumming and is such a preventable issue. I’ve covered this common repair in this post “Mower stats then dies”, or check out the video library if you need video help with carburetors or other common mower problems.

This mechanics top tip – Use a gas stabilizer. Adding a gas stabilizer will prevent carburetor gumming over the winter hibernation months, come spring it’s pull and mow, Nice! Check out the gas stabilizer video here and you’ll find a link there to the stabilizer I recommend.

Mower Troubleshooting


Carburetor Repair, Maintenance & Adjustment How-To Guide

Your Briggs and Stratton carburetor is an integral part of your small engine, so it’s important to keep it running smoothly for the overall health of your lawn mower, snow blower, and other outdoor power equipment. In this article, we’ll give you tips on carburetor maintenance and repair to keep your small engine healthy – so that you can use your power equipment worry-free!

Before starting any carburetor maintenance or repair work, make sure to consult the Briggs & Stratton operator's manual for the machine you will be working on and follow all safety precautions.

Carburetor Maintenance: Cleaning & Adjusting Small Engine Carburetors

Performing regular carburetor maintenance is a great way to save yourself money, headaches, and hassle down the road.

Most carburetor problems are caused by a variety of blockages from things like dirt, varnish, and gasoline deposits. It's easy for the main fuel jet to become blocked, but luckily it's a pretty easy fix. Regular carburetor maintenance will help you avoid problems in the future.

You can clean the main fuel jet (located in your carburetor's fuel bowl nut) with carburetor cleaner and compressed air to blow out loosened debris. Carburetor cleaner dissolves deposits in your carburetor and choke, and consequently can reduce your need for maintenance, repair, and downtime, while improve starting for all 2-cycle and 4-cycle engines.

Lawn Mower Carburetor

After cleaning the carburetor, another key step for some float-type carburetors is adjusting the idle speed and mixture. Carburetor adjustments can only be made on older, non-EPA regulated carburetors and are generally as follows:

The high-speed (or needle valve)-if equipped-should be turned 1-1/2 turns open from the seat; the idle valve should be turned 1-1/4 turns open from the seat.

Carburetors are now manufactured per EPA emission standards and are not adjustable, they are factory set. First and foremost, don’t tamper or attempt to modify engines designed to meet EPA standards. Not only is it illegal and comes with civil penalties, but it can cause a host of problems. Knowingly disabling an emission control system component will violate the EPA regulations. Installing a part that differs from that originally on an engine that meets EPA standards also may bring penalties for tampering.

Normal maintenance (replacing air filters and spark plugs) and routine servicing such as rebuilding carburetors or replacing jets for high altitude operation are still perfectly acceptable. Full instructions forOverhauling a Briggs and Stratton Carburetorare available in our FAQ section.

Briggs & Stratton engine tune--up kits contain new air filters, spark plugs, oil, and easy step-by-step instructions. You can findengine tune-up kits in the Briggs & Stratton official parts store online.

Troubleshooting Carburetor Problems in Your Lawn Mower or Small Engine

Sometimes, if your carburetor is gummed up beyond simple maintenance, it may be necessary to rebuild or overhaul it. You can find detailed carburetor repair instructions in our "Overhauling the Carburetor" FAQ article.  Carburetor problems are often at the root of many issues with outdoor power equipment. By performing carburetor repair with official Briggs and Stratton parts and cleaner, you can help ensure that your small engine is healthy and running right.

If you have any questions about performing carburetor repair on your small engine, official Briggs and Stratton dealers are here to help. Your local Briggs and Stratton dealer can assist with any small engine repair and maintenance issues you may have. Performing regular carburetor maintenance will save you trouble down the road, so make sure you don't neglect it - and then you can get back to enjoying using your Briggs & Stratton outdoor power equipment!

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View solutions for handling the most common engine and product troubleshooting and maintenance questions.

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How do you rebuild or overhaul a small engine carburetor?

Rebuilding the carburetor may be required if basic adjustments don’t fix your small engine problems or improve performance on your lawn mower or outdoor power equipment. Follow the steps below for overhauling small engine carburetors.

WARNING: Always read the engine and equipment manual(s) before starting, operating, or servicing your engine or equipment to avoid personal injury or property damage. Fuel and its vapors are extremely flammable and explosive. Always handle fuel with extreme care.

See an authorized dealer or contact Briggs & Stratton if you are unsure of any procedure or have additional questions. Find all Engine Safety Warnings

Step 1: Removing the Carburetor
Step 2: Disassembling A Float-Type Carburetor
Step 3: Inspecting the Carburetor
Step 4: Inspecting Air-Fuel Mixture Screws
Step 5: Reassembling the Small Engine Carburetor
Step 6: Attaching The Carburetor & Air Cleaner Assembly

Rebuild Small Engine Carburetor by Briggs and Stratton

Step 1: Removing the Carburetor

  • Disconnect the spark plug lead and secure it away from the spark plug. Then, remove the air cleaner assembly.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Turn off the fuel valve at the base of the fuel tank. If your engine does not contain a fuel valve, use a fuel line clamp to prevent fuel from draining out of the tank while the carburetor is disconnected from the engine.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Some carburetors contain an electrical device at the base of the fuel bowl to control afterfire. Disconnect the device, known as an anti-afterfire solenoid, by removing the wire connector from the solenoid's receptacle.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • With the carburetor still connected to the governor, unfasten the carburetor mounting bolts. If a connecting pipe joins the carburetor to the engine block, first remove the pipe mounting bolts. Then, disconnect the carburetor from the pipe by removing the nuts and sliding the carburetor off the studs. Sketch the governor spring positions before disconnecting them to simplify reattachment.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Then, disconnect the governor springs and remove the carburetor, taking special care not to bend or stretch links, springs or control levers.

Step 2: Disassembling A Float-Type Carburetor

Your carburetor contains a small amount of fuel. Prepare a clean bowl to catch dripping fuel and store small parts. During disassembly, inspect the bowl for dirt and debris to determine the condition of your carburetor.

  • Remove the fuel bowl from the carburetor body. The fuel bowl may be attached with either a bolt or the high-speed mixture screw.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Push the hinge pin out of the carburetor body with a small pin or pin punch. Take care to tap only the pin to avoid damaging the carburetor body.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Remove the float assembly, inlet needle valve and fuel bowl gasket.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • If your carburetor contains an idle mixture screw, remove it along with the spring.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Rotate the throttle plate to the closed position, remove the throttle plate screws and the throttle plate.
Rebuild Small Engine Carburetor
  • Remove the throttle plate shaft and foam seal.
Rebuild Small Engine Carburetor
  • Then, remove the choke plate and choke shaft and felt or foam washer in the same manner.
  • Use your carburetor repair kit to identify replaceable welch plugs. These seals cover openings in the carburetor left over from machining. Insert a sharpened 5/32" pin punch at the edge of each plug to be removed and tap cleanly to free the plug.
Rebuild Small Engine Carburetor
  • Unscrew the main jet from the side of the carburetor pedestal (if equipped). Then, unscrew the emulsion tube; it may be screwed in tight. A carburetor screwdriver is the best tool for the job. It's designed to fit the slot in the head or the emulsion tube so that you won't damage the threads inside the pedestal of the tube itself as you loosen it.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Remove the emulsion tube.
Rebuild Small Engine Carburetor by Briggs and Stratton

Step 3: Inspecting the Carburetor

  • Soak metal and plastic carburetor parts in all-purpose parts cleaner for no more than 15 minutes to remove grit. Or, while wearing safety glasses, spray the parts with carburetor cleaner. Then, wipe away solvent and other residue thoroughly using a clean cloth. Never use wire or tools because they can damage or further obstruct plugged openings.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Inspect all components and use additional carburetor cleaner to loosen stubborn grit and to clear obstructions.
  • Replace any parts that are damaged or permanently clogged.

Step 4: Inspecting Air-Fuel Mixture Screws

  • Brass mixture screws control the air-fuel mixture at high speed and at idle. Over tightening can damage the tip of the screw so that proper adjustment is no longer possible.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Remove any non-metal parts and soak mixture screws in carburetor cleaner for 15 minutes.
  • Then, inspect them carefully for wear. Replace a mixture screw if the tip is bent or contains a ridge.

Step 5: Reassembling the Small Engine Carburetor

  • Install new welch plugs from your repair kit using a pin punch slightly smaller than the outside diameter of the plug. Tap on the punch with a hammer until the plug is flat (strong blows with the hammer will cause the plug to cave in). Then, seal the outside edge of the plug with enamel nail polish.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Assemble the choke by inserting the return spring inside the foam seal and sliding the spring and seal assembly onto the choke shaft. Plastic choke plates have a stop catch at one end of the spring; metal plates have a notch to hold the hook at one end of the spring.
  • Insert the choke shaft into the carburetor body and engage the return spring. If the choke lever uses a detent spring to control the choke plate position, guide the spring into the notched slot on the choke lever. Place the choke plate on the shaft with the single notch on the edge toward the fuel inlet. Lift the choke shaft and lever up slightly and turn counterclockwise until the stop on the lever clears the spring anchor. Push the shaft down.
  • Insert the choke plate into the choke shaft or attach it with screws so that the dimples face the fuel inlet side of the carburetor. The dimples help hold and align the choke shaft and plate.
  • Install the throttle shaft seal with the sealing lip down in the carburetor body until the top of the seal is flush with the top of the carburetor. Turn the shaft until the flat side is facing out. Attach the throttle plate to the shaft with the screws so that the numbers on the throttle plate face the idle mixture screw and the dimples face in.
  • Install the inlet needle seat with the groove down, using a bushing driver. Then, install the inlet needle on the float and install the assembly in the carburetor body.
  • Insert the hinge pin and center pin. Then, install the rubber gasket on the carburetor and attach the fuel bowl, fiber washer and bowl nut.

Step 6: Attaching The Carburetor & Air Cleaner Assembly

  • Position the carburetor so the beveled edge fits into the fuel intake pipe and attach the carburetor with nuts or bolts, as required, leaving these fasteners loose for final tightening with a torque wrench. Consult your Briggs & Stratton Authorized Dealer for proper tightening torque.
Rebuild Small Engine Carburetor by Briggs and Stratton
  • Install the air cleaner assembly, making certain that the tabs on the bottom of the air cleaner are engaged.

More Carburetor Repair Resources

How to Clean a Small Engine Carburetor

Briggs \u0026 Stratton Riding Lawn Mower Engine Carburetor #591736

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Stratton briggs location and carburetor

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