TPCABPART Huayi 4X90A Carburetor with Air Filter — Direct Replacement for Cub Cadet 993-00170, 547cc 4X90HU/4X90HUA

The TPCABPART Huayi 4X90A carburetor with integrated air filter is a direct-fit replacement for Cub Cadet, Troy-Bilt and MTD 4X90-series 547cc engines, restoring reliable fuel delivery and easier starting.

If your XT1-LT42 or compatible lawn tractor is running rough, hard to start, or losing power, a worn or clogged carburetor is often the culprit. This Huayi 4X90A unit replaces Cub Cadet part numbers 993-00170 and 993-00170A and is built to match the original equipment specifications for 4X90HU / 4X90HUA engines. It ships complete with the air filter assembly shown, making it a convenient option for routine repair or engine refurbishment.

What engines and models will this carburetor fit?

This carburetor is designed for 547cc single-cylinder OHV engines in MTD, Cub Cadet and Troy-Bilt equipment using the 4X90HU/4X90HUA family. Confirm your machine’s part number before ordering to ensure compatibility.

• Direct replacement for part numbers 993-00170 and 993-00170A.
• Fits Cub Cadet XT1-LT42 (2015) and XT1-LT42 serial 13W8A1CS010 (2016).
• Compatible with many MTD, Troy-Bilt and Craftsman models that use 4X90-series engines.
• Intended for 547cc engine variants labeled 4X90HU / 4X90HUA.

How does installation and fitment work for a backyard mechanic?

Installation follows the same mounting points and fuel inlet locations as the original factory carb, so the swap is straightforward for someone comfortable with basic small-engine work. Use the original gaskets and hardware when possible and check linkages for proper adjustment after installation.

• Mounts to the same intake flange and throttle linkage as OEM units.
• Comes with the air filter assembly pictured for quicker replacement.
• Expect to reuse or replace gaskets to prevent air leaks.
• Adjust the idle and mixture screws per engine manual after fitting.

What performance and reliability can I expect from this Huayi carburetor?

Built to OEM dimensions, this Huayi unit aims to restore proper fuel metering and steady idle, improving starting, throttle response and load-handling compared to a degraded carburetor. It’s not a performance upgrade but a functional replacement engineered for consistent operation.

• Restores factory fuel flow and idle stability when installed correctly.
• Air filter reduces contamination for longer carburetor life.
• Manufactured to match original fit and mounting points.
• Suitable for seasonal maintenance and engine rebuilds.

What should I check before buying to avoid returns?

Verify your engine model and part number against the listed replacements and confirm the carburetor’s mounting style matches your existing unit. Inspect fuel lines, choke linkage and intake flange orientation to ensure compatibility.

• Compare part numbers: 993-00170, 993-00170A and existing carb label.
• Confirm engine code 4X90HU / 4X90HUA and 547cc displacement.
• Check that throttle and choke linkages align with your tractor’s hardware.
• Have replacement gaskets on hand for a clean seal during install.

Who is this for: The TPCABPART Huayi 4X90A carburetor with air filter suits homeowners, landscapers and small-engine technicians who need a ready-to-install OEM-style replacement for mid-size lawn tractor engines. If you own a Cub Cadet XT1-LT42 (2015–2016) or a mower with a 4X90-series 547cc engine and you want to restore reliable starting and steady running without modifying the engine, this part is designed for you. Always follow safety guidelines and your engine manufacturer’s service procedures when replacing fuel system components.