Briggs & Stratton Brand [Lifetime Warranty] 5021K Carburetor Diaphragm Gasket Kit - Compatible with 2HP Thru 5HP Engines B&S 270026 272538 272538S 272637 4157 4168 5021 5021K 690766 221377 Spring Cap - Pack of 6
Pack of 6 carburetor diaphragm, gasket, and spring kits for 2HP-5HP Briggs & Stratton engines.
Black carburetor diaphragm gasket for 2HP-5HP engines with informational text overlay.
5021K carburetor diaphragm gasket kit with spring and cap for 2HP-5HP engines, showing component details.
5021K carburetor diaphragm, spring, and cap kit for 2HP-5HP small engines.
Installation guide showing hands replacing a carburetor diaphragm on a small engine lawn mower.
Carburetor diaphragm, spring, and cap kit for 2HP to 5HP engines, compatible with B&S 272538 and 5021K.
Compatibility chart for 5021K carburetor diaphragm gasket kit for 2HP to 5HP Briggs & Stratton engines.
Two black carburetor diaphragm gaskets for 2HP-5HP engines, highlighting durable material quality.
5021K carburetor diaphragm, spring, and cap kit for 2HP-5HP small engines.
Pack of 6 carburetor diaphragm, gasket, and spring kits for 2HP-5HP Briggs & Stratton engines.
Black carburetor diaphragm gasket for 2HP-5HP engines with informational text overlay.
5021K carburetor diaphragm gasket kit with spring and cap for 2HP-5HP engines, showing component details.
5021K carburetor diaphragm, spring, and cap kit for 2HP-5HP small engines.
Installation guide showing hands replacing a carburetor diaphragm on a small engine lawn mower.
Carburetor diaphragm, spring, and cap kit for 2HP to 5HP engines, compatible with B&S 272538 and 5021K.
Compatibility chart for 5021K carburetor diaphragm gasket kit for 2HP to 5HP Briggs & Stratton engines.
Two black carburetor diaphragm gaskets for 2HP-5HP engines, highlighting durable material quality.
5021K carburetor diaphragm, spring, and cap kit for 2HP-5HP small engines.
Lifetime Warranty

[Lifetime Warranty] 5021K Carburetor Diaphragm Gasket Kit - Compatible with 2HP Thru 5HP Engines B&S 270026 272538 272538S 272637 4157 4168 5021 5021K 690766 221377 Spring Cap - Pack of 6

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5021K Carburetor Diaphragm & Gasket Kit (Pack of 6)

This carburetor diaphragm gasket kit is designed for Briggs & Stratton 2HP to 5HP engines. It provides a complete and reliable solution for restoring proper carburetor function and maintaining smooth engine performance.

Package Contents

Each kit includes:

  • 6 × Carburetor diaphragms
  • 6 × Springs
  • 6 × Spring caps

Please carefully confirm your engine model and part numbers before purchasing to ensure correct compatibility.

Exact Replacement Parts

Replaces Briggs & Stratton service part numbers:

  • Diaphragm: 272538, 270026, 272637
  • Spring: 692206, 260455
  • Spring Cap: 690766, 221377

Wide Compatibility

Designed for Briggs & Stratton 2HP through 5HP engines with a horizontal crankshaft.

Compatible with carburetor models: 5021K, 5021, 5021A, 5021B, 5021C, 5021D, 5021H.

Used on Briggs & Stratton part numbers including: 270026, 272538, 272538S, 272637, 4157, 4168, 5021, 5021A, 5021B, 5021C, 5021D, and 5021H.

Fits Briggs & Stratton Engine Series

Compatible with a wide range of Briggs & Stratton engine series, including but not limited to:

060201, 060202, 060206, 060211, 060212, 060231, 060232, 060251, 060252, 061201, 061202, 061211, 061212, 061231, 061232, 061251, 061252, 080201, 080202, 080203, 080206, 080211, 080212, 080213, 080216, 080231, 080232, 080233, 080236, 080251, 080252, 080253, 080256, 080291, 080292, 080296, 081201, 081202, 081203, 081206, 081211, 081212, 081213, 081216, 081231, 081232, 081233, 081236, 081251, 081252, 081253, 081256, 081292, 081296, 082231, 082232, 082252.

Durable & Reliable Construction

This carburetor diaphragm gasket kit is manufactured using corrosion-resistant and wear-resistant materials for long service life. It is ideal for replacing old, dirty, or clogged carburetor components, helping restore optimal fuel delivery and engine performance.

Lifetime Protection

Enjoy peace of mind with our lifetime protection guarantee. This diaphragm gasket kit is fully covered against defects or performance issues, ensuring dependable use for years to come.

FAQ

This kit is designed for Briggs & Stratton 2 through 5 horsepower engines equipped with a horizontal crankshaft, including the 450 through 600 series. It is compatible with carburetor models 5021, 5021A, 5021B, 5021C, 5021D, 5021H, and 5021K.
This kit serves as a direct replacement for Briggs & Stratton part numbers 270026, 272538, 272538S, 272637, 4157, 4168, 5021, 5021K, 690766, 221377, 692206, and 260455.
If your engine is surging, hunting for idle, difficult to start, or running inconsistently, the diaphragm may have stiffened or cracked due to age or ethanol-blended fuel exposure. Since the diaphragm acts as the fuel pump on these Pulsa-Jet carburetors, a loss of flexibility prevents the engine from receiving a consistent fuel supply.
Each pack contains 6 sets of the essential components for a carburetor rebuild, including the diaphragm, the fuel pump spring, and the spring cap.
When installing, ensure the mating surfaces of the carburetor and fuel tank are clean and free of old gasket material or debris. The diaphragm must be seated correctly against the tank flange before tightening the carburetor mounting screws. It is recommended to tighten these screws in a cross-pattern to ensure even pressure and prevent vacuum leaks.
The primary cause of failure is the degradation of the rubber material, often accelerated by the use of ethanol-blended fuels. Over time, the diaphragm loses its elasticity and becomes brittle, which prevents it from pulsing correctly to draw fuel from the tank into the carburetor.