799727 698620 Carburetor Fit for BS 799727 698620 794572 14HP 15HP 16HP 17HP 17.5 HP 18HP Intek Engines Lawn Tractor Mower Nikki Carb with Air Filter Kit

What It Is

This is a complete Nikki-style carburetor replacement kit (part numbers 799727, 698620, 794572) for Briggs & Stratton Intek single-cylinder engines used on lawn tractors and zero-turn mowers. It includes the carburetor, gaskets, and an air filter kit—everything needed to fix surging, hard starting, or fuel delivery issues on 14HP to 18HP Intek engines.

Fitment & Compatibility

Check your engine model number – The carburetor fits B&S Intek engines with model numbers like 31C707, 31P777, 31R907, 31R977, and similar. Look for the engine’s model/type/code stamped on the valve cover or blower housing. It does not fit older B&S engines (e.g., Quantum, Classic) or non-Intek models.

Check your OEM part number – This replaces genuine B&S parts 799727, 698620, and 794572. If your current carb has a different number (e.g., 591889 or 594261), this likely won’t match.

Check your mounting pattern and fuel line size – Measure the distance between the two mounting studs (center to center) – it should be ~2.5 inches. Also confirm your fuel line is 1/4-inch ID (standard) not 5/16-inch.

Brand/Model fit – Fits most lawn tractors with B&S Intek engines from MTD, Cub Cadet, Troy-Bilt, Husqvarna, Craftsman, John Deere, and others. No deck size check needed – fitment is purely engine-based.

Key Things to Know

• Aftermarket quality varies – This is a non-OEM carburetor. It may require minor adjustment of the idle mixture screw (usually 1.5 turns out from lightly seated) and careful cleaning of any debris from the bowl before installation.
• Installation difficulty – Moderate. Requires removing the air filter housing, fuel line, and throttle/governor linkage. Label or photograph the linkage position before disconnecting – it’s easy to misroute.
• Common gotchas – The included air filter may not perfectly match your housing; reuse your old filter if needed. Also, the carburetor gaskets may be slightly thicker than OEM – use a thin layer of gasket sealer if you see air leaks.
• No return policy surprises – Most sellers accept returns only if unused. Test fit the carburetor before applying any sealant or tightening fully.

Should You Buy It

Buy this if your B&S Intek engine (14-18HP) is surging, flooding, or won’t start and you want a budget-friendly fix that includes a new air filter kit. It’s a good value for DIY mechanics comfortable with basic carburetor tuning. Skip it if you need an exact OEM fit with zero adjustments, or if your engine is not a single-cylinder Intek model.