Key Features

Genuine Briggs & Stratton OEM component (398188) designed to fit specified carburetor models with correct dimensions and seal geometry.
Precise fuel regulation that controls entry into the carburetor bowl, supporting accurate fuel level, stable idle, and consistent engine performance.
Durable construction resists corrosion and wear in fuel-system environments, extending service life during routine maintenance or rebuilds.
Accurate fitment minimizes leakage and flooding, reducing hard-starting and excessive fuel consumption.
Part reference 398188; cross-references include 395188, 798188, and 799188 where applicable, depending on engine model and carburetor variant.

Product Details

Description: Briggs & Stratton Needle & Seat – 398188 is a genuine OEM carburetor component that regulates fuel flow into the carburetor bowl to maintain proper fuel level and engine performance.
Performance impact: Helps deliver smooth idling, reliable fuel metering, and reduced flooding during transient operating conditions.
Materials and construction: Engineered to withstand fuel exposure and typical wear without compromising sealing or metering accuracy.
Fitment considerations: Dimensions and geometry are specific to bowl size, float height, and fuel inlet configuration; ensure compatibility with your carburetor by referencing the engine’s Model–Type–Code and the illustrated parts list.
Maintenance relevance: Essential component for carburetor rebuilds, routine service, or troubleshooting erratic fuel delivery in lawn mowers, garden tractors, and outdoor power equipment.
Original specification: Manufactured to Briggs & Stratton original equipment specifications for dependable, predictable performance.

Designed for select Briggs & Stratton carburetors and engines where this needle & seat assembly is specified in the parts diagram.
Typical engine series compatibility: Briggs & Stratton 31 Series, 33 Series, and 35 Series single-cylinder engines.
Supports certain horizontal OHV small engines and older Classic and Sprint carburetors; exact compatibility depends on stamped Model/Type/Code.
Cross-references available: 395188, 798188, 799188 (availability varies by catalog and engine variant).
Fitment tip: Before ordering, verify your engine’s Model–Type–Code (found on the data tag) and consult the illustrated carburetor parts list to confirm that 398188 is the correct needle and seat for your carburetor.