13AN77XS093 Carburetor for Craftsman Lawn Tractor Replace 13ALA1ZT091 Carb With Air Filter

What It Is

This is a complete carburetor assembly for Craftsman lawn tractors, including an integrated air filter. It’s designed to replace the OEM 13ALA1ZT091 carb on 13AN77XS093-series mowers, typically used on 42” to 54” deck tractors with 17.5–24 HP Briggs & Stratton single-cylinder engines.

Fitment & Compatibility

Critical checks before buying:

• Model number match: This fits Craftsman models ending in 13AN77XS093. Verify your tractor’s model tag (under seat or on frame) matches exactly—not just the deck size.
• OEM replacement: It replaces part 13ALA1ZT091. If your original carb has a different OEM number, this may not bolt up.
• Engine type: Works with Briggs & Stratton 31C707, 31P707, and 31R907 series engines. Confirm your engine’s model number (stamped on valve cover or blower housing).
• Physical dimensions: Measure mounting bolt spacing (center-to-center) – should be 2.5”. Also check fuel inlet tube diameter (typically 1/4” or 5/16”) and choke linkage style (manual vs. automatic).
• Deck size irrelevant: Deck size doesn’t matter—engine model is the key.

Key Things to Know

• Quality: Aftermarket unit; reviews are strong (4.8/5) but some report needing to adjust float height or idle mixture screw out of the box. Expect minor tuning.
• Installation difficulty: Moderate—requires removing old carb, swapping gaskets (included), and reconnecting fuel line, throttle cable, and choke linkage. Budget 30–60 minutes.
• Common gotcha: The included air filter may be slightly smaller than OEM; check it seals fully against the housing to avoid unfiltered air intake.
• Return policy: At $33.99, it’s cheap enough to gamble, but confirm seller accepts returns if fitment is wrong.

Should You Buy It

Buy this if your Craftsman 13AN77XS093 tractor has a failing carb (hard start, surging, fuel leak) and you want a low-cost, complete swap with air filter included. It’s a solid value for DIYers comfortable with basic carb tuning—but if you need a perfect OEM drop-in with zero adjustments, stick with the $60+ genuine Briggs part.