Parts for Briggs & Stratton 121S00 (0005-2415): Sump-Engine Parts

This oil seal is a common part engineered to work in engines that power generators, vacuum cleaners, snowblowers, leaf blowers, mowers, and other small engine applications. The seal sits between the crankcase and the crankshaft. It is designed as a barrier to prevent oil leakage and to stop contaminants from leaving the crankcase. When the gasoline engine exhibits diminished power, and especially if it begins to emit oily gray or bluish smoke, there is a good chance the oil seal needs to be replaced. In order to replace the faulty seal, begin by removing the starter housing and taking off the nut that holds the starter wheel to the main shaft. The user will find the old seal on this shaft. Remove it and install the new seal, pushing it into place with the edges of a socket, then tapping it securely into place with a hammer. When choosing a replacement seal, remember to use an OEM genuine replacement part that is guaranteed to match the specs for the original part. This will ensure a quality match and long replacement life. This seal is compatible with Toro, Lawn-Boy, and Briggs & Stratton engines.

This genuine replacement crankcase gasket creates an airtight seal on the crankcase so that oil and air do not leak out of the engine when it is running. Over time, this gasket is exposed to extreme pressure and high heat and will naturally deteriorate. It could become faulty and create leaks or it could break entirely. In either case, a full replacement of the gasket is the only solution. This OEM part can provide an exact fit for compatible lawn and garden equipment engines. This genuine crankcase gasket is manufactured to strict standards by Briggs & Stratton and is compatible with select engines on lawn mowers and generators from Briggs & Stratton, Lawn Boy, and Toro. This gasket is made of durable composite material and it is sold as an individual unit. Other gaskets, hardware, or related parts are all sold separately. The repair can be done with just a wrench, but be sure to allow the engine to cool entirely before beginning any repairs. Always wear gloves and disengage the spark plug for safety when performing engine work.

This authentic replacement oil seal is for use with a range of small engines. The oil seal is the lower seal that is located in the engine's sump. The seal is made to ensure that there are no oil leaks that could cause issues with the performance of the engine. If the seal is not working properly, it could result in leaks, and the machine may not have enough oil to function properly. Lack of oil can also cause serious issues with the engine. The oil seal is prone to wearing out over time. The seal can become worn and it can start to deteriorate the longer it is used. Owners should make it a point to replace the oil seals whenever they are changing their oil, oil filter, and gaskets. The oil seal is a genuine OEM replacement part, and it is sold individually. The oil seal is compatible with more than 150 different models of machine. This includes models of lawnmower, snowblowers, pressure washer, leaf blowers, generator, wood chipper, and other small engines. Compatible brands include Briggs & Stratton, Craftsman, Toro, Lawn-Boy, and Simplicity.

The flywheel key is the component on outdoor equipment that keeps the flywheel connected to the crankshaft. Over time, this key may become damaged or broken, particularly if the engine experiences a forceful stop, like hitting a large stationary object. If the flywheel key breaks, the engine will not start. A slightly damaged flywheel key is noticeable through symptoms like misfiring, backfiring, or having no power. If any of these are occurring, the flywheel key should be replaced to prevent complete engine failure.A flywheel puller tool is required for this repair. Make sure the engine is cool before working on the flywheel. Wear safety gear, including gloves and eye protection. Disconnect the spark plug and remove the blower housing. Remove the flywheel mounting nut and set it aside. Take the recoil starter cup off the mower. Use the flywheel puller to remove the flywheel and access the flywheel key. Remove the broken flywheel and replace it with the new flywheel. Reverse the steps to put the mower back together.This flywheel key is made of an aluminum alloy and is sold as an individual part. It is designed for use in lawnmowers, lawn tractors, and other small engines manufactured by Briggs and Stratton, Toro, Lawn-Boy, Simplicity, MTD, and others.

Size: 6-32 x 3/8 inch.

This screw is a genuine Midwest Engine replacement part for small engine appliances, including lawn tractors, lawn mowers, snowblowers, leaf blowers, vacuums, and tillers. The purpose of a screw is to tightly link materials together through rotation that pierces into the material. A screw might have to be replaced in the event that it is lost or misplaced, a common occurrence due to its size. A screw might also be replaced if it deteriorates over time, through erosion, cracking, or piercing, thereby reducing its efficacy in holding materials together. This kind of damage can be attributed to general overuse, to age, or simply to long-term exposure. If a screw is subject to any of this kind of damage, it is best to replace it immediately, as the materials held together by the screw must continue to be held together. Remember to always wear gloves when handling, repairing, and operating outdoor equipment. This screw is compatible with the following brands: Briggs & Stratton, Toro, Cub Cadet, and Lawn Boy.

This valve retainer is an authentic replacement part for use with many types of small lawn and garden engines. The retainer valve helps to keep the lock valve spring on the valve. It is shaped similarly to a washer, which will fit over the top of the valve spring. The piece also helps to add space between the valve spring and the head of the valve. The valve retainer is made from metal, and it is a small piece. The retainer could become lost and need replacement when performing other maintenance on the engine's valves. The metal could also become corroded or break. In those cases, it will need to be replaced as soon as possible. This is a genuine OEM replacement part that is sold individually. The part can be used with many types of equipment including lawn mowers, snowblowers, tillers, pressure washers, edgers, leaf blowers, log splitters, and wood chippers. Compatible brands include Briggs & Stratton, Craftsman, Toro, Cub Cadet, Murray, Lawn-Boy, Snapper, MTD, Simplicity.

Almost all small gasoline engines are started by pulling a starter rope, which initiates the compression in the cylinder that fires a spark plug, igniting the air-fuel mixture that starts a small gasoline engine. Starter ropes may become frayed with use and have to be replaced. Replacing the starter rope is not time-consuming. Begin by removing the shroud, the part of the manifold that covers the starter pulley. After removing the old starter rope, insert one end of the new rope into the pulley assembly and tie a knot in it so it won’t slip out of the slot. Then feed the rope into the starter pulley assembly by holding tension on the rope and using a screwdriver to turn the pulley assembly counter-clockwise until it is taut. Hold the pulley in place with the screwdriver to keep the spring from unwinding as you replace the shroud over the assembly. Keeping the tension on the rope, remove the screwdriver. The only thing left is to attach the starter rope to the mower handle. This starter rope is a genuine OEM manufacturer’s replacement part made by Midwest Engine. It is designed to work on most any Briggs & Stratton, Simplicity, Cub Cadet, or Toro made small engine. These engines are used on lawnmowers, chippers, and other small engines. It is sold individually.

This grip-starter rope is a genuine Midwest Engine replacement part for outdoor appliances with small pull start engines, such as lawn mowers, snowblowers, wood-chippers, leaf blowers, and chainsaws. The grip-starter rope is the piece that allows an appliance user to start the engine by pulling the rope; this mechanism can be referred to as a recoil starter, a starter rewind, or a rope start as well. Any damage to a grip-starter rope will be obvious to the naked eye; while the problems with the actual starting mechanism of a pull start-operated engine might be more difficult to assess and root out, the damage to the actual grip-starter rope itself will come in the form of tears, rips, and general time-worn erosion of the casing material of the rope. If there is significant tearing on the rope itself, this replacement grip-starter rope can serve as a replacement part. Remember to always wear gloves when handling, repairing, and operating outdoor equipment. This grip-starter rope is compatible with the following brands: Briggs and Stratton, Toro, Cub Cadet, and Simplicity.

A healthy carburetor part is crucial for the proper functioning of the lawn mower. It mixes air and fuel before passing it on to the engine. Any number of symptoms could indicate a faulty carburetor, ranging from poor engine performance to black smoke from the exhaust. Other indicators of a bad carburetor include backfiring, overheating, and hard-starting. The replacement or repair process of the carburetor is straight-foward, but the user replacing the part should always wear gloves during any assembly, replacement, or installation processes. The user should also refer to the owner's manual of their equipment and any guiding diagrams that clarify the placement location.This carburetor is an OEM part sourced directly from the manufacturer, and it is sold individually. It is manufactured by Midwest Engine. A carburetor is a vital piece of hardware. It is designed for use with pieces of outdoor lawn and garden power equipment that have small engines, specifically for a lawn mower. This carburetor is made out of metal. It is compatible with products from brands such as Briggs and Stratton and Cub Cadet.

The carburetor float is housed in the carburetor and is used to help control the fuel flow. It adjusts the needle valve and ensures that the appropriate amount of fuel reaches the carburetor bowl. This helps provide the right mixture of air and gasoline for the engine to operate at optimal performance. Over time, the float can become worn or detached, or the pin could come loose. When this happens, the flow is affected, and the engine will not operate correctly. If the float isn't working correctly on a lawnmower or another small engine, it might be time for a replacement. This replacement part is a genuine OEM product designed to be used with many Briggs & Stratton engines, including lawnmowers, pressure washers, generators, and other lawn and outdoor equipment engines. It is sold as a single unit with the metal cotter pin included. There are more than 150 compatible machines that this unit will work with. If your lawnmower isn’t working as it should or if the float has come loose and can't control the flow appropriately, this OEM replacement can get things back in working order.

This kit-needle/seat is also called a float needle. It is a genuine Midwest Engine part. It is a replacement part for various makes and models of small engine machinery, such as lawn mowers, edgers, and more. On these machines, float needles have ears or tabs on the ends that help stop leaks while letting gas in, especially in the carburetor.A faulty, damaged, or broken float needle may be responsible for leaks, especially small leaks when the engine runs. If the machine is leaking, the float needles should be checked. Before making any repairs, be sure to allow the engine to properly cool, empty the fuel tank, and disconnect the spark plug to prevent the engine from accidentally powering on.This gear is a genuine OEM part that is sourced directly from the manufacturer. It is sold individually. It is made to be compatible with equipment with small engines manufactured by Briggs and Stratton.

This part is a replacement float bowl gasket. This is a genuine OEM part made by Midwest Engine and has been sourced directly from the manufacturer. This part is intended for use as a replacement in a snapped, worn, or otherwise defective float bowl gasket in various engines. This float bowl gasket seals the gap between the float bowl and the carburetor, which helps to prevent fuel from leaking. Gaskets are particularly subject to wear and tear, and over time will become weathered, brittle, or otherwise deteriorated, thus requiring replacement. If you notice fuel leaking from the engine, this gasket may need to be replaced. Wear work gloves to protect the hands and check that equipment is powered off and cooled down before starting the repair process. For more accurate information on how and where to install this float bowl gasket, the appropriate owner's manual and equipment diagrams should be referred to. This float bowl gasket is a genuine OEM part made of durable materials and is sold individually. It is suitable for use with small engines that have been manufactured by Midwest Engine and Briggs and Stratton.

This is a fuel line replacement intended to keep a lawnmower's engine running smoothly. It is long enough to make a couple of fuel lines, just cut the fuel line to the desired length and keep the rest as a spare. When a mower doesn't start easily or performs poorly when running, the fuel delivery system may have a problem and will need repair. The fuel line that supplies gas from the tank to the carburetor may be cracked or broken. When this occurs, it is best to replace the fuel line before it becomes a flammable hazard. This is an OEM replacement fuel line sourced from the manufacturer and is sold individually. This replacement part is compatible with different Briggs & Stratton mowers. Remember to use work gloves and drain the gas tank before the installation of this part.

This sealing washer is a genuine Midwest Engine part, sold individually. This sealing washer can be used as a replacement part for a variety of small engine outdoor appliances including chipper shredders, lawn mowers, and tillers. The purpose of a sealing washer is to create space between fastening components so they are not damaged by friction.The sealing washer of an outdoor appliance might have to be replaced if it is lost, misplaced, or damaged to the point that it cannot serve its function. The sealing washer could be stripped over time from general wear and tear or, as it is a small part, can be lost or misplaced easily. If this occurs, the component should be replaced by this genuine OEM replacement part. Remember to always wear gloves when handling, repairing, and operating outdoor equipment. Always unplug the appliance before performing any kind of repair or replacement.This is an OEM part sourced directly from the manufacturer. It is sold individually. This sealing washer is compatible with the following outdoor appliance brands: Midwest Engine, Briggs & Stratton, and Cub Cadet.

Spark plugs work by providing an electric spark in a combustion chamber, igniting the mix of fuel and air that allows the engine to turn and propel a drive shaft. Insulated with ceramic to make sure the electric charge flowing through it is properly discharged, the plug is screwed into the cylinder head. The movement of the piston sucks fuel into the cylinder until it reaches the optimum level, the compression triggering the spark plug to send a pulse that ignites the fuel and pushes the piston to the back of the cylinder. This process is repeated hundreds of times a minute in an internal combustion engine. Eventually spark plugs simply wear out, particularly if they are not properly gapped, if the fuel mixture is improper, or the engine is subject to excessive use. This plug is compatible with most lawnmowers, small engines, and pressure washers made by Briggs & Stratton, Cub Cadet, and Toro. The plug itself is a guaranteed OEM part and is sold individually.

This genuine rocker switch is designed as an identical replacement part for select models of blower/vacuum units. The rocker switch is also known as a power switch or on/off switch and it is what controls the current to electric blowers. The switch is made of plastic and metal. This switch may become worn and not function well after regular use because of the repetitive motion of turning the machine on and off. In some cases, the switch may experience electrical malfunctions that could present a fire hazard or keep the unit from working at all. In the event that the switch is damaged or defective, it will need to be replaced. This genuine OEM replacement rocker switch is manufactured by Briggs & Stratton. It can be used with more than 150 models of machines from Briggs & Stratton, Toro, and Vanguard. This part is made of durable plastic and metal components and is sold as an individual unit. It plugs into the pressure washer via wires, but a screwdriver may be needed to assist in the installation. Always disconnect the power supply when working on electrical components and wear gloves for safety.

This genuine Midwest Engine air filter cleaner can be used as a replacement part for the small engine of power washers. The purpose of an air filter cleaner for a power washer is to prevent the accumulation of debris, dirt, pebbles, and other such external materials that could be sucked into the engine through the air filter and cause damage to the internal components of the appliance.Air filter cleaners might have to be replaced several times within the regular lifespan of a power washer as a part of routine maintenance. If the air filter cleaner is damaged by the intake of dirt and debris or is otherwise punctured, pierced, ripped, torn, or eroded over time, the air filter cleaner should be removed immediately and replaced with this genuine OEM replacement part before using the small engine appliance again. Remember to always wear gloves when handling, repairing, and operating outdoor equipment. This is an OEM part sourced directly from the manufacturer. It is sold individually. This air filter cleaner is compatible with the following brands: Midwest Engine, Briggs & Stratton, and Troy-Bilt.

The stop switch, sometimes called a kill switch, is triggered to stop the engine when the operator is no longer on the seat ,This is important for safety. If the stop switch is not functioning properly, inspect it for damage and replace it right away. Operating a machine without a functional stop switch can be dangerous. The stop switch is a genuine OEM part, and it is sold individually. The switch can work for many types of equipment including lawn tractors, lawnmowers, log splitters, wood chippers, pressure washers, and tillers. The replacement part is compatible with a range of brands, including Midwest Engine, Toro, Craftsman, Briggs & Stratton, Lawn-Boy, Murray, Snapper, and MTD.

The spark plug boot is a rubber piece that is responsible for connecting the spark plug to the spark plug wires and completing the connection. Spark plugs are necessary to create the engine spark that will start the motor in lawn equipment and other small engines. The boot holds the terminal and keeps everything protected from the elements and insulated so that it continues to work correctly. If the spark plug connection seems weak or if the existing boot is damaged, this replacement could provide the solution. This durable rubber boot will insulate the spark plugs and help any small engine run better. This spark plug boot replacement can be used with a number of Briggs & Stratton engines and is compatible with hundreds of different machines from Toro, Lawn-Boy, and Briggs & Stratton. This boot replacement is sold individually as a single piece and does not include the terminal or any other housing or materials.

This screw is designed to be used on all sorts of lawn and garden equipment. The metal screw is durable and attaches to the muff guard bracket to keep it in place and stable while the equipment is being used. This screw can become damaged through overuse or wear and tear. It can also break or become stripped, which will require it to be replaced.Visually inspecting the area with the muff guard bracket is connected to the rest of the equipment will give information about whether the screw is broken or damaged. The screws can also be cleaned to be more visible so small problems are easier to pick up on. Sometimes the screws can become loose, which is another situation where a replacement is needed. Simply use a screwdriver to take out the old screw and replace it with a new one.This screw is a genuine OEM replacement part that is directly sourced from the manufacturer. It comes as an individual part. The screw can be used on snowblowers, lawnmowers, lawn tractors, tillers, pressure washers, leaf blowers, edgers, generators, wood chippers, and log splitters made by MasterCut, Simplicity, MTD, Snapper, Lawn-Boy, Wheel Horse, Cub Cadet, Toro, Craftsman, and Briggs & Stratton.

This genuine OEM replacement part is a spark plug terminal for a wide variety of small combustion engines. In a combustion engine, the spark plug generates a small electrical charge that creates enough power to start up the ignition and engage combustion. The plug connects to the ignition through the terminal. Spark plugs generate and then pass a small electrical current through to the ignition. Usually, the main issue with spark plugs is that this current hyper-extends and ends up frying the spark plug. However, if the terminal is damaged, the charge will not pass into the ignitor, and the engine will not turn. If the spark plug can carry a charge but the engine still won't turn, it's likely the terminal that needs replacing. This is an easy repair because the terminal should just snap on and off. If stuck, a pair of needle-nose pliers should make it easier. This high-quality replacement part is compatible with engines from Murray, Toro, Lawn Boy, and Briggs & Stratton. It is sourced from the original manufacturer and ships individually.

This spring brake is a genuine Midwest Engine part that can be used as a replacement part for outdoor appliances with small engines, including lawn mowers, chipper shredders, snowblowers, and other such appliances. Spring brakes are a braking system employed a large, coiled spring that is kept under high tension; the control valves attached to the spring brake are the mechanism by which the spring brake is released.If the spring brake has been damaged, is malfunctioning, or is in a state of disrepair, this will manifest in the form of a sudden, volatile eruption from the air brake chamber. This is a dangerous state for a small engine, so repair should be conducted immediately. Additionally, a new spring brake part should be ordered before any attempt to use the appliance without a proper repair. Remember to always wear gloves when handling, repairing, and operating outdoor equipment, and stay safe around the small engine of the appliance if the spring brake has malfunctioned and caused a dangerous situation.This spring brake is compatible with the brands Briggs and Stratton, Cub Cadet, and Toro.

This is a fuel tank cap for compatible lawnmowers, snowblowers, and pressure washers. It’s constructed from black plastic and is designed as a simple drop-in replacement. No modifications or adjustments need to be made on any compatible engine model. Fuel tank caps can become damaged if the tank is dropped or if other damage causes the cap to become cracked. This is a safety hazard and should be fixed as soon as possible. They can also become damaged if the cap becomes detached from the clip. To remove the old fuel tank cap, the only tool that should be required is a pair of pliers. Pinch the clip shut where the tether connects to the fuel tank housing and pull it loose to remove it without causing any damage. This is an OEM part sourced directly from the manufacturer, and it is sold individually. It’s been used for several brands, including Briggs & Stratton, Troy-Bilt, Toro, and Craftsman.

This replacement part is a float bowl. This part is a small part of the carburetor and is able to hold a small amount of liquid gasoline. This serves as a reservoir for fuel.If the engine is unable to run due to lack of fuel, it might be because of a malfunctioning float bowl. Be sure to wear work gloves during this repair as working near the carburetor might be dangerous in certain situations. This is a genuine replacement part made by Midwest Engine. It is an OEM replacement part which will ensure a proper fit. This part is sold individually.

A carburetor float bowl is an essential part of every carburetor because it controls the flow of gasoline from the fuel tank to the motor. Whether because of gasoline impurities or lots of use, the interior pieces of small engines may fail and need to be rebuilt. For that purpose, the float bowl comes with the three required gaskets. Replacing the float bowl in a Briggs & Stratton carburetor is a simple process. First, detach the carburetor from the engine, then removing the screw from the top of the carburetor housing. Replace the large gasket with the new one, making sure that it fits properly and will seal. Then set the new float bowl down onto the gasket. Next, take the small gasket and place it atop the float bowl, screwing the bolt onto the float bowl. Then it’s time to reattach the carburetor to the Briggs & Stratton engine. This OEM assembly is a factory-built replacement for the original parts it replaces. It is individually packaged and sold separately. Mowers, chippers, generators, blowers, snowblowers, tillers, and other small engines using a Briggs & Stratton engine can use this replacement kit. Among compatible brands are Craftsman, Snapper, Simplicity, Toro, Cub Cadet, and Lawn boy.