Carbhub Carburetor Replacement for Troy-Bilt Style 7HP–9HP Engines — Fits 390323/394228/398170, Includes Filter & Gaskets

Carbhub replacement carburetor engineered to fit Troy-Bilt style 7HP–9HP horizontal engines (interchange numbers 390323, 394228, 398170) for dependable fuel delivery and simpler engine restoration.

When a worn or clogged carburetor leaves a mower, tiller or small engine hard to start or running poorly, this Carbhub assembly gives you a direct-fit substitute that restores fuel flow without buying a whole engine. The kit includes the carburetor plus common installer parts so you can replace the unit and return the machine to service quickly. Compatibility lists and included hardware make it a practical repair option for many popular Troy-Bilt and compatible horizontal engine models.

Which engines and part numbers will this Carbhub carburetor replace?

This carburetor is built as a replacement for interchange numbers 390323, 394228 and 398170 and fits a range of 7HP, 8HP and 9HP horizontal engines. It matches numerous OEM horizontal engine model codes and many Troy-Bilt lawn and garden models for a wide aftermarket fit.

• Interchange: 390323, 394228, 398170
• Fits engine model families: 170401, 170402, 170412, 170417, 170431–171457 and many 190/194/195 series
• Suitable for 7HP, 8HP and 9HP horizontal engines commonly found in small outdoor power equipment

What comes in the box and why those parts matter?

The package contains the carburetor plus several installation consumables so you can complete the repair with fewer trips to the parts store. The included fuel filter, gaskets and clamps eliminate common leak and contamination failure points that often impair performance after a rebuild.

• 1x carburetor — the replacement unit
• 1x fuel filter and 1x spark plug — starter maintenance items
• Gaskets, 2x clamps and 2x bolts — for sealing and securing the installation

How difficult is installation and what tools will I need?

Installation is a straightforward mechanical task for anyone comfortable with small-engine maintenance. Expect basic hand tools, a clean work area, and about 30–90 minutes depending on access and experience. If hoses or linkage are stiff, a bit more time may be required.

• Common tools: screwdrivers, pliers, wrench set, socket set
• Tip: take photos of linkage and hose routing before removal for easier reassembly
• Allow time to check for fuel leaks and verify throttle/choke movement after fitting

Will this fix common carburetor problems like hard starting or rough idle?

Replacing a degraded carburetor often resolves issues caused by damaged floats, clogged jets or warped gaskets, returning more consistent fuel metering. However, symptoms from ignition, air leaks or fuel delivery upstream (tank lines, primer bulbs) should be checked separately to ensure full repair.

• Addresses internal carburetor wear and clogged jet problems when original unit is failing
• Does not replace upstream fuel tank contamination remedies or ignition troubleshooting
• Pair with a clean fuel line and fresh spark plug for best results

Who is this for: This Carbhub kit is aimed at DIY mechanics, lawn and garden equipment owners, and small-engine repair shops that need a cost-effective, compatible replacement for 7HP–9HP horizontal engine carburetors. If you own a compatible Troy-Bilt or similar model showing hard starting, stalling, or poor throttle response, this direct-fit carburetor plus installation parts streamlines the repair and gets equipment back to reliable operation without replacing the engine.