WHFZN TB110 Carburetor for Troy-Bilt TB110 140cc 550EX, Direct-Fit Replacement with Rebuilt Jets

WHFZN TB110 carburetor is a direct-fit replacement for Troy-Bilt TB110 mowers equipped with Briggs & Stratton 140cc 550EX engines, restoring reliable fuel flow and engine start-up.

If your Troy-Bilt TB110 lawnmower is hesitating at startup, stalling under load, or using more fuel than usual, the carburetor is a common wear item. This WHFZN TB110 replacement matches the original mounting and fuel connections and substitutes for multiple OEM part numbers, making it a straightforward fix to get a 140cc Briggs & Stratton 550EX back to dependable running condition.

How will this carburetor improve my mower's starting and idling?

Installing the WHFZN TB110 carburetor replaces worn internal jets, float, and needle seat that commonly cause hard starts and rough idle. The rebuilt fuel metering restores the proper air–fuel ratio so the engine cranks and idles more consistently.

• Direct-fit design for easy bolt-on replacement
• New float and needle for proper fuel level control
• Reconditioned jets to stabilize idle and throttle response

Will this unit fit my mower and which OEM numbers does it replace?

This carburetor is made for Troy-Bilt TB110 models using the Briggs & Stratton 140cc 550EX engine family. It replaces several factory part numbers and compatible aftermarket model codes, simplifying parts lookup.

• Replaces part numbers: 594058, 594057, 592361, 594529, 799584
• Compatible with model codes such as 09P602-0023-F1 through 09P602-0117-F1 and many 08P502 variants
• Designed to match original mounting, throttle linkage, and fuel inlet layout

What should I expect during installation and maintenance?

Installation is typically a straightforward mechanical swap requiring basic hand tools and minimal mechanical experience. Clean the manifold surfaces, transfer any linkage or gaskets as needed, and check fuel lines for cracks to ensure long service life.

• Basic tools: wrench set, screwdriver, gasket sealant if recommended
• Inspect and replace cracked fuel hoses and old gaskets during installation
• After install, run engine briefly to verify idle and adjust choke/throttle as required

How durable is this replacement and what parts does it include?

The WHFZN TB110 carburetor is built to match the original component's service role and contains the key moving parts that wear over time. While longevity depends on fuel quality and storage, the unit returns the mower to factory-style operation when installed correctly.

• Includes new float, needle valve, and metering orifices
• Cast body and precision-machined mounting surfaces for a sealed fit
• Works with the existing choke and throttle linkages used on TB110 models

Who is this for: This WHFZN TB110 carburetor is intended for Troy-Bilt TB110 owners, DIY small-engine technicians, and service shops maintaining mowers with a Briggs & Stratton 140cc 550EX engine. Choose this part if you need a direct replacement to fix hard starting, stalling, or erratic idling, and if you want compatibility with multiple original part numbers to simplify repairs. If you're uncertain about model compatibility, compare the OEM numbers listed to your engine’s carburetor tag or consult a parts diagram before purchase.