Briggs & Stratton O-Rings
Genuine Briggs & Stratton O-rings seal critical engine components including carburettors, intake manifolds, fuel bowls, and fuel line connections. We hold O-rings in stock and sell worldwide for lawn mowers, pressure washers, and garden equipment. These rubber seals prevent air leaks and fuel leakage whilst maintaining proper engine performance. Common failures include ethanol fuel damage causing swelling, age-related hardening, and cracking. Replacement O-rings must be fuel-resistant materials such as Viton or nitrile. Proper sizing and installation ensures leak-free operation. We stock Briggs & Stratton O-rings for all engine series globally.
Available Briggs & Stratton O-Rings
Seal O-Ring
690589
Briggs & Stratton
£7.00
In Stock
Seal O-Ring
841653
Briggs & Stratton
£12.55
In Stock
Seal, O-Ring
594209
Briggs & Stratton
£4.40
Available
Seal O-Ring
691870
Briggs & Stratton
£4.70
Available
Seal O-Ring
691876
Briggs & Stratton
£3.75
Available
Seal O-Ring
799581
Briggs & Stratton
£4.05
Available
Seal, O-Ring
699942
Briggs & Stratton
£4.25
Available
Seal O-Ring
842678
Briggs & Stratton
£15.90
Available
Seal O-Ring
698550
Briggs & Stratton
£4.35
Available
Seal O Ring
710072
Briggs & Stratton
£6.20
View More
Seal O Ring
270344S
Briggs & Stratton
£4.50
In Stock
Seal O Ring
691031
Briggs & Stratton
£4.80
In Stock
Frequently Asked Questions
Can I reuse O-rings during carburetor cleaning?
Reusing O-rings risks immediate or premature failure causing fuel leaks and fire hazards. Removing O-rings stretches and distorts them, compromising seal integrity. Old O-rings exposed to fuel and heat have already lost elasticity. Even if appearance seems acceptable, internal deterioration prevents proper sealing. Always replace all O-rings and gaskets during carburetor service—rebuild kits cost substantially less than repairing fire or fuel leak damage. Fresh O-rings ensure leak-free operation and prevent repeat repairs.
What's the proper way to install carburetor O-rings?
Clean all mating surfaces thoroughly removing old gasket material, fuel residue, and debris. Inspect O-ring grooves for damage or scoring. Apply light coating of engine oil or petroleum jelly to O-ring before installation—never use grease which can swell rubber. Position O-ring squarely in groove without twisting or stretching. Tighten carburetor mounting bolts gradually in cross-pattern to specified torque preventing O-ring pinching. Over-tightening crushes O-rings causing leaks. Allow assembled carburetor to sit 10 minutes before starting engine, letting O-rings fully seat.
What are the symptoms of a failed carburetor O-ring?
Engines with failed carburetor O-rings exhibit rough running, surging, difficult starting, and fuel leakage around the carburetor bowl or intake manifold. Air leaks at intake manifold O-rings create lean fuel mixture causing backfiring and hunting at idle. Fuel bowl O-rings leak petrol onto the engine when cracked or hardened. Check for visible fuel wetness around carburetor mounting points and bowl gasket. Failed O-rings often cause air leaks detectable by spraying carburetor cleaner around suspect areas whilst engine runs.
Why do O-rings deteriorate quickly in small engines?
Modern ethanol-blended fuels aggressively attack standard rubber O-rings causing swelling and degradation. Ethanol concentrations above 10% accelerate deterioration of non-fuel-resistant materials. Heat cycling from engine operation hardens O-rings over time, reducing flexibility and sealing capability. Vibration and thermal stress cause cracking after prolonged use. Old fuel left in carburettors forms varnish deposits that damage O-ring surfaces. Always use fuel-resistant Viton or nitrile O-rings rather than standard plumbing O-rings which fail rapidly in petrol applications.
How do I identify the correct replacement O-ring size?
Measure the failed O-ring's inner diameter and cross-section thickness using calipers or compare against the original part number stamped on engine diagrams. Common Briggs & Stratton intake O-rings include 691917, 692138, and 270344S for different engine series. Carburetor bowl O-rings vary by model—consult parts diagrams using engine model and type numbers. Hardware store plumbing O-rings appear similar but lack fuel resistance and fail quickly. Always verify replacement O-rings are manufactured from Viton or nitrile materials suitable for petrol exposure.