Briggs and Stratton 797890 Carburetor Overhaul Kit

What It Is

The Briggs and Stratton 797890 Carburetor Overhaul Kit is a genuine OEM service kit designed to rebuild the carburetor on single-cylinder Briggs & Stratton engines, commonly found on walk-behind mowers, lawn tractors, and pressure washers. It includes the gaskets, seals, needle valve, and float needed to restore proper fuel flow and idle performance.

Fitment & Compatibility

This kit fits a wide range of Briggs & Stratton engines with model numbers in the 120000, 130000, and 140000 series, particularly those using the Nikki or Walbro carburetors. Before buying, locate the engine model number (e.g., 12H702) stamped on the valve cover or flywheel shroud—not the mower deck size or brand. Cross-check the carburetor part number (often on a tag or stamped into the carb body) to ensure it matches the kit’s intended carburetor type. Avoid aftermarket “universal” kits; this OEM kit ensures correct float height and gasket fit.

Key Things to Know

• Quality: Genuine Briggs parts—gaskets are die-cut, float is pre-set, and needle/seat are OEM spec. No ethanol-safe issues if used with fresh fuel.
• Installation difficulty: Moderate. You’ll need a small screwdriver, socket set, and carburetor cleaner. Expect 30–60 minutes if you’ve done it before; longer if you’re learning.
• Common gotchas: The float bowl gasket can be sticky—use a plastic scraper to avoid gouging. Also, the kit does not include a new carburetor bowl or main jet; inspect those separately for damage.
• Not a full carburetor: This is an overhaul kit, not a replacement carb. If the carb body is cracked or warped, you need a new carburetor (e.g., Briggs 799869).

Should You Buy It

Buy this if you have a Briggs single-cylinder engine with a Nikki or Walbro carb that’s clogged from old gas, but the carb body is still sound. It’s a solid value at $75 for OEM reliability, especially if you’re comfortable with basic small-engine repair. Skip it if the carb is physically damaged or you want a quick swap—buy a complete replacement carb instead.