Powtol Carburetor for Huskee LT4200 & Craftsman 420cc Engines — 951-12771A Direct Replacement, Brass Jets & Anodized Aluminum

If your lawn tractor or walk-behind mower is running rough, flooding, or refusing to stay idling, a worn or clogged carburetor is often the culprit. This Powtol unit is engineered as a direct replacement for part numbers like 951-12771A, 751-12771A and compatible OEM references, matching port sizes and mounting geometry so installation is straightforward on many 420cc, 90mm-bore engines used by Huskee, Craftsman, Cub Cadet, Yard Machines and other MTD-family machines.

What exactly does this carburetor replace and which machines will it fit?

This Powtol carburetor is designed to replace multiple OEM references and fit a broad list of lawn tractors, mini riders and walk-behind mowers. It matches the dimensions and inlet/outlet sizes used on many 420cc engines, making it compatible with popular models from Huskee, Craftsman, Cub Cadet, Troy-Bilt and MTD.

• Replaces: 951-12771A, 951-12771, 751-12771, 751-12771A, 751-12823, 951-12823.
• Fits engines: 4P90HU, 4P90JHA, 4P90JU, 4P90JUA, 4P90JUB, 4P90MU, 4P90MUA, 4P90MUB (420cc, 90mm bore).
• Compatible machines: Huskee LT4200/LT3800, Craftsman R1000/T1000/T1200/LT1500, Cub Cadet CC30/CC760ES, Yard Machines tractors, select Troy-Bilt mowers.

How does the design ensure durability and correct fuel delivery?

Powtol built this carburetor with materials chosen to resist the heat, vibration and corrosion commonly faced in outdoor power equipment. It uses brass fittings, a zinc-plated float bowl and an anodized aluminum body to maintain shape and function over repeated heating cycles; the high-density plastic float helps control fuel level precisely.

• Durable components: brass jets, zinc-plated float bowl, anodized aluminum body.
• Precision float: high-density plastic float for stable fuel metering.
• Tested performance: wet-flow tested to simulate real engine fueling conditions.

What are the critical measurements and connection sizes I need to know?

Confirming a few key dimensions ahead of purchase prevents fitment issues. This carburetor uses commonly found diameters and mounting hole spacing for the 420cc MTD-based engines, and the fuel inlet and throttle/choke bore sizes match OEM expectations for direct swap installations.

• Mounting hole center-to-center: 50 mm.
• Throttle bore diameter: 26.9 mm; choke bore diameter: 30.5 mm.
• Fuel inlet line inner diameter: 7.8 mm (includes 2ft fuel line in kit).

What comes in the box and how does it simplify installation?

Powtol ships this carburetor as an installation-ready kit so you receive the small consumable parts that commonly need replacing along with the carb unit. That reduces downtime and avoids an extra trip for filters, gaskets or spark plugs while you repair the machine.

• Included: Powtol 951-12771A carburetor x1, air filter x1, fuel filters x2.
• Also included: 2-foot fuel line, spark plug x1, and three gaskets for proper sealing.
• All parts are matched and wet-flow tested for consistent fuel delivery on installation.

Who is this for: This replacement is aimed at homeowners, lawn-care DIYers, and small-engine technicians who need a reliable carburetor swap for 420cc MTD-based engines. Choose this kit if you want a direct-fit replacement that arrives with the common consumables and sizing details needed to get your Huskee, Craftsman, Cub Cadet, Troy-Bilt or Yard Machines unit back to working order without guessing which gaskets or filters are required.