Carburetor for Briggs & Stratton 594492 500cc 17.5hp Engine Replaces Parts# 27761152 with Air Filter

What It Is

This is an aftermarket carburetor assembly designed for Briggs & Stratton 500cc 17.5hp single-cylinder engines (model series 31C707, 31C907, 31P977). It replaces OEM part# 594492 and 27761152, and includes the air filter. Common on riding mowers, zero-turns, and larger walk-behinds from brands like MTD, Troy-Bilt, Cub Cadet, and Craftsman.

Fitment & Compatibility

• Engine model: Must be a Briggs 500cc (17.5hp) with a vertical shaft and a plastic or metal intake elbow. Check your engine’s model number (stamped on valve cover or blower housing) – only 31C7xx, 31C9xx, or 31P977 series.
• OEM cross: Replaces 594492 and 27761152. If your original has a different number (e.g., 591920), this likely won’t fit.
• Physical check: Measure the mounting stud spacing (typically 2.5" center-to-center) and the intake port diameter (~1.25"). Verify the air filter housing matches your mower’s air cleaner cover.
• Deck size irrelevant – fitment is purely engine-side. Ignore deck size; focus on engine model.

Key Things to Know

• Quality variance: Aftermarket carburetors at this price often have slightly different jet sizes or tolerances. Expect minor tuning – you may need to adjust the idle screw or clean debris from the bowl.
• Installation difficulty: Moderate. Requires removing the old carb, swapping the gasket, and reconnecting fuel line and throttle linkage. No special tools beyond a socket set and pliers.
• Common gotcha: The included air filter may be a generic foam type, not the exact paper element your mower uses. Keep your original filter housing if it’s in good shape.
• Fuel system prep: If your old carb failed due to ethanol gum or debris, flush the fuel tank and line before installing – or you’ll clog the new one quickly.

Should You Buy It

If you have a confirmed Briggs 500cc/17.5hp engine (model 31C7xx/31C9xx/31P977) and need a budget fix for a non-starting or rough-idling mower, this is a solid value at $29.99. It’s not OEM quality, but it’s cheap enough to be worth a try – just be prepared to spend 30 minutes on installation and minor adjustment. Skip it if you want a plug-and-play OEM replacement or if your engine model doesn’t match.