TB100 Carburetor Tune Up Kit Fit For Troy Bilt TB100 Lawn Mower 11A-B0BL723 11A-A230711 11A-A23N011 25B-554M711 25B-554M766 11A-020W765 Carb with Air Filter & Cover

What It Is

This is a carburetor tune-up kit for Troy-Bilt TB100 walk-behind lawn mowers. It includes a replacement carburetor, air filter, and air filter cover, designed to restore fuel flow and air filtration on engines that are surging, stalling, or hard to start.

Fitment & Compatibility

Before buying, verify your mower’s model number—not just the deck size. This kit fits these specific Troy-Bilt models: 11A-B0BL723, 11A-A230711, 11A-A23N011, 25B-554M711, 25B-554M766, and 11A-020W765. These are all TB100 series mowers with a 140cc or 150cc Briggs & Stratton engine (typically the 500E series). Measure your existing carburetor mounting bolts (center-to-center) to confirm—this kit uses a standard 2-bolt pattern. It’s an aftermarket part, not OEM Troy-Bilt, but matches the original carburetor design. If your mower uses a different carburetor (e.g., side-mount or primer bulb style), this won’t fit.

Key Things to Know

• Quality: The included carburetor is a pre-assembled, direct replacement unit. Users report it’s plug-and-play, but some have noted the air filter cover’s plastic may be slightly thinner than OEM.
• Installation difficulty: Easy for DIYers—remove the old carburetor (2 bolts, fuel line, and throttle linkage), swap the new one on, and attach the filter/cover. No adjustments needed.
• Common gotcha: The kit does not include a fuel line or gaskets. Reuse the old ones or buy separately if they’re cracked. Also, drain old fuel and clean the tank before installation to prevent debris from clogging the new carb.
• Performance: Most users see immediate improvement in starting and smooth idling, but if your mower’s engine has other issues (e.g., bad valve seals or spark plug), this alone won’t fix it.

Should You Buy It

If your TB100 mower has a surging or non-starting engine and you’ve already checked the spark plug and fuel quality, this kit is a cost-effective fix. It’s ideal for DIY owners who want a complete swap (carb + filter) in one purchase, without sourcing separate parts. Skip it if you need OEM-only parts or if your mower’s model isn’t listed above.