799727 Carburetor for Briggs & Stratton 14HP 15HP 16HP 17HP 17.5 HP 18HP Intek Engines CarbReplace 791858 794572 591731 594593 Lawn Tractor Mower Nikki Carb with Air Filter kits

What It Is

This is a direct-replacement Nikki carburetor for Briggs & Stratton Intek single-cylinder engines (14HP–18HP), commonly found on lawn tractors, zero-turns, and riding mowers. It replaces OEM carb numbers 791858, 794572, 591731, and 594593, and includes two air filters and gaskets.

Fitment & Compatibility

• Engine family: Briggs & Stratton Intek (model number prefix 31, 33, 40, 44, 49, or 61 series). Not for Vanguard, Quantum, or older flathead engines.
• Check your engine’s model/type/code: Look on the valve cover or blower housing. This carb fits engines with 1-inch intake and 1.25-inch flange spacing (Nikki-style). Measure your old carb’s mounting bolt spacing—center to center—to confirm.
• OEM vs aftermarket: This is an aftermarket part. It may need minor adjustment (idle mixture screw, float level) out of the box. Not identical to OEM in every detail.
• Deck size irrelevant: Compatibility is engine-only. Deck size doesn’t matter.
• Included: Carburetor, two air filters, gaskets, and mounting hardware. No fuel line or primer bulb.

Key Things to Know

• Quality is adequate for the price but expect to clean or adjust the float bowl needle and seat if it leaks or runs rich. Some units ship with debris in the fuel passages—blow them out with compressed air before install.
• Installation is straightforward for someone comfortable with a socket set and screwdriver. Remove the old carb, transfer the throttle/governor linkage (keep the spring orientation), and torque the mounting bolts evenly (5–7 ft-lbs max—overtightening cracks the plastic intake).
• Common gotcha: The included air filters may not seal perfectly on all Intek air boxes. Keep your old filter if the new one doesn’t fit snugly.
• Return policy matters: Not all sellers accept returns on carburetors due to fuel contamination. Test fit and function immediately.

Should You Buy It

Buy this if you have a Briggs Intek engine with a dead or clogged Nikki carb and want a cheap, fast fix for a seasonal mower. Skip it if you need a long-term, zero-hassle repair for a commercial machine—spend the extra $20–30 on an OEM or high-quality aftermarket carb (e.g., Stens or Rotary).