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6121 - Overview

Models starting with 6121

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Grommet – Part Number: 692187
$6.40
On Order
Grommet
★★★★★
★★★★★
(2)
Part #692187
This grommet is an OEM part that is a 45-degree elbow for the crankcase breather tube of your mower engine. That is why it is also known as a 45-degree breather tube. The part is made of rubber and is black in color. You must purchase this part individually. Your grommet may require replacing if you notice dark smoke coming out of the exhaust. This is a telltale sign that your grommet has become cracked and damaged. Other symptoms are a reduction in the mower performance, or a backfiring engine. According to our customers, this is an easy repair. It requires no tools. Simply attach the grommet to the breather tube from the crankcase to the carburetor.
Diaphragm-carburetor – Part Number: 270026
No Longer Available
Diaphragm-carburetor
★★★★★
★★★★★
(3)
Part #270026
This is a carburetor diaphragm, which is an OEM part that pumps fuel from the tank to the engine. It is roughly 1x2 inches and black in color. Sold individually, this part can fail due to fatigue and wear, and if it is broken you may notice your engine is running rough or not starting. If your engine exhibits these signs of being starved of fuel, your diaphragm is damaged and needs to be replaced. Our customers found this repair to be of medium difficulty. It requires a wrench, screwdriver, and pliers to complete. You will be able to locate your diaphragm inside the carburetor itself to swap it out with your new one.
Gasket-fuel Tank – Part Number: 272409S
$6.40
On Order
Gasket-fuel Tank
Part #272409S
This fuel tank gasket is an OEM part certified by the manufacturer, and it provides a seal on the gas tank and carburetor of your machine. This fuel tank gasket is gray in color and made of composite materials. It is sold individually and is not part of a kit or assembly. Over time, the gasket can become damaged due to fatigue or wear, or it can dry out and the seal will fail. If you notice fuel leaking from the fuel tank gasket, it is time to replace it. This is a medium-difficulty repair that requires a wrench, sockets, and a screwdriver. You will look to reinstall your new part between the carburetor and gas tank. Note that if your carburetor and tank are separated for any other repairs or maintenance, you will also need to replace your fuel tank gasket regardless of condition, as it is a one-time use.
Key-flywheel – Part Number: 222698S
$6.40
In Stock
Key-flywheel
★★★★★
★★★★★
(1)
Part #222698S
This is a Genuine OEM replacement part used on a variety of Lawn and Garden equipment. The key helps to secure Flywheel in place. This is a Metal Key and it is Sold Individually. You would need Pliers to replace this item.
Clutch-starter – Part Number: 399671
$48.09
In Stock
Clutch-starter
★★★★★
★★★★★
(2)
Part #399671
This starter clutch is an authentic OEM replacement part used in small outdoor power engines. Each package includes one clutch and one ball bearing. The starter clutch allows the engine to start by engaging the crankshaft to spin the engine and initiate combustion. Once the engine starts the clutch disengages to prevent over spinning. Over time the clutch may fail due to worn-down bearings, or damage to the clutch body, resulting in hard starting or failure to start. To replace it, first, disconnect the spark plug for safety. Then, remove the engine cover to access the starter clutch. Remove the clutch from the crankshaft, and thoroughly clean the mounting shaft. Install the new clutch by screwing it onto the crankshaft, then reassemble the engine cover and reconnect the spark plug.
Plug-spark – Part Number: 692051
$7.17
In Stock
Plug-spark
Part #692051
This item has been OEM sourced to ensure quality. The spark plug is intended to be used with outboard motors and lawnmower engines from Briggs & Stratton. The spark plug threads into the cylinder and is used to create an electric arc that ignites the air/fuel mixture inside the combustion chamber. A spark plug wrench may be needed to install this part. This item is sold individually.
Seal-oil – Part Number: 299819S
$7.47
In Stock
Seal-oil
Part #299819S
This OEM Oil Seal is an individually sold rubber part which is attached around the axis shaft on the crankcase housing to provide a proper seal. A broken seal will lead to a leak, and the part should be replaced. Installation is rated as "Medium" difficulty by customers, and will require a screwdriver, wrenchset and seal puller. Refer to your make, model and diagrams to ensure you've chosen the correct part. This model comes in black and grey.
Gasket-intake – Part Number: 27355S
$6.40
In Stock
Gasket-intake
Part #27355S
This is an authentic manufacturer sourced replacement part designed for use with a variety of lawn and garden equipment. This carburetor intake gasket which provides an air tight seal for the carburetor. Over time gaskets tend to deteriorate and would need to be replaced. It is made out of compound material and it is sold individually. You would need a screwdriver to replace this item.
Gasket-breather – Part Number: 27549S
$6.40
In Stock
Gasket-breather
Part #27549S
The Breather Gasket is OEM and used to provide an airtight seal for the breather assembly. It is a gray part, attached between the breather cap and engine. Installation is rated "Easy" and will require a wrench set and socket set. If broken, damaged, or worn due to fatigue, there may be oil leaking from it, and the engine may be running rough from an unwanted vacuum sucking in air. If this happens, replace the part. Refer to your make, model and diagrams to ensure this is the correct part for you.
Hose-vacuum – Part Number: 791766
$10.60
On Order
Hose-vacuum
Part #791766
This genuine part is sourced directly from the original equipment manufacturer. It is specially designed for use with Briggs and Stratton engines commonly installed on lawn and garden equipment. The purpose of this hose is to transfer vacuum from the engine. Unfortunately, over time the material may wear out and begin to crack eventually requiring a replacement. Make sure to check the diagrams of your model for the exact location and the correct installation of this part. Note, this item includes one durable rubber hose and two metal clamps to secure it.
Engine Screw – Part Number: 692198
$8.01
In Stock
Engine Screw
Part #692198
This OEM engine screw is a genuine Briggs & Stratton replacement fastener designed for secure, vibration-resistant attachment of engine components in small gasoline engines and outdoor power equipment. Manufactured to exact factory specifications, it provides proper thread engagement and clamping force to help prevent loosening, reduce vibration, and maintain long-term engine reliability under operating stress. Built with durable, corrosion-resistant materials for extended service life, it is an ideal replacement when original screws are missing, stripped, or worn, helping ensure safe assembly, consistent performance, and proper engine operation.
Seal-valve – Part Number: 691963
$16.89
On Order
Seal-valve
Part #691963
It is an authentic OEM supplied part that is designed for use with Briggs and Stratton engines commonly installed on lawn and garden equipment. This part provides a seal for the tappet valve. It is an identical replacement for a missing or a faulty part that was included with a new unit. Please make sure to check the appropriate diagrams of your model for exact location and application of this component. Keep in mind this high-quality valve seal is sold individually.

Exact Part matches for your search term

DISCONTINUED – Part Number: 6121
No Longer Available
DISCONTINUED
This part number matches the current model number 6121
Part #6121
Panel-Dash – Part Number: 6121
No Longer Available
Panel-Dash
This part number matches the current model number 6121
Part #6121
IGNITER, USA – Part Number: 6121
$164.24
Special Order
IGNITER, USA
This part number matches the current model number 6121
Part #6121
OIL DRAIN TUBE-SNOW 208CC – Part Number: 6121
$33.74
Special Order
OIL DRAIN TUBE-SNOW 208CC
This part number matches the current model number 6121
Part #6121

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Could not keep an aftermarket muffler on the engine.
15 of 20 people found this instruction helpful.
  • Richard from KERNERSVILLE, NC
  • Really Easy
  • 15 - 30 mins
  • Wrench set
Once I determined what OEM muffler I needed, installation was relatively easy. I have a 1982 4hp Briggs on my Snapper tiller. There was a 90* galvanized elbow coming out of the exhaust port, with a bezel nut to lock it down. Do not remove the elbow, even though it appears that you should. If you install the muffler without the elbow the m uffler will parallel the the vacuum for the carburetor and can melt the rubber couplers. Use the elbow to direct the heat away from the carburetor. Use a pipe wrench to lock down the bezel nut because the weight of the muffler, especially under vibration, can work loose and fall down on the tine belt cover and melt it. The bezel nut that comes with the muffler should also be used to lock down the muffler to the threaded intake bracket that comes with the muffler, not to replace the bezel nut for the elbow.
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