Carburetor For 42" Troy bilt pony 13WM77KS011 13AN77KS211 13WN77KS066 13AM77KS011 13AN77TG766 13AN77KG066 Riding Lawn Mower Tractor With Briggs Stratton 15.5HP 17.5HP 500cc Engine

What It Is

This is a direct-replacement aftermarket carburetor for 42-inch Troy-Bilt Pony riding mowers equipped with Briggs & Stratton 15.5HP or 17.5HP 500cc single-cylinder engines. It meters fuel and air into the engine for combustion, designed to restore performance on mowers with model numbers like 13WM77KS011, 13AN77KS211, 13WN77KS066, 13AM77KS011, 13AN77TG766, or 13AN77KG066.

Fitment & Compatibility

Before buying, check these three things:

• Engine model: This carb fits Briggs & Stratton 15.5HP and 17.5HP engines (typically 500cc series). Confirm your engine’s model/type/code stamped on the valve cover or shroud – not just the mower model number.
• Deck size: Designed for 42-inch cutting decks. If your deck is 38 or 46 inches, it may not match the throttle/choke linkage or intake manifold.
• Aftermarket vs OEM: This is an aftermarket part, not a genuine Briggs & Stratton. It includes gaskets and sometimes a fuel line adapter. Measure the mounting bolt spacing (typically 2.75 inches center-to-center) and bowl nut size to confirm physical fit. The choke and throttle linkage arms must align with your mower’s control cables.

Key Things to Know

• Installation difficulty: Moderate – you’ll need basic hand tools (socket set, screwdriver) and patience to transfer linkage springs and adjust the idle mixture screw. Expect 30–60 minutes.
• Quality variance: Aftermarket carburetor quality can vary. Some users report needing to clean out debris or adjust the float height before installation. Check the bowl gasket for a proper seal.
• Common gotcha: The included gaskets may not match your intake manifold perfectly. Reuse your old gasket if the new one is too thick or thin. Also verify the fuel inlet fitting matches your fuel line diameter (usually 1/4-inch).
• Tuning required: After installation, you’ll likely need to adjust the idle speed and mixture screws (turn out 1.5 turns from lightly seated as a starting point). A small tachometer helps.

Should You Buy It

If your Troy-Bilt Pony with a 42-inch deck and 15.5HP/17.5HP Briggs engine is surging, hard-starting, or running lean, this $28 carb is a cost-effective fix – especially if you’re comfortable with basic engine work and minor tuning. It’s not for purists who insist on OEM parts or for mowers with different engine series (e.g., 20HP+ or 540cc), but for a quick, budget-friendly refresh on a common riding mower, it’s a solid choice.