TB100 Carburetor For Troy Bilt TB100 Lawn Mowers 11A-B0BL723 Carb With Air Filter & Cover

What It Is

This is a complete carburetor assembly for Troy-Bilt TB100 walk-behind mowers, including the air filter and cover. It replaces a clogged or failing carburetor that causes hard starting, rough idling, or stalling.

Fitment & Compatibility

Before buying, verify your mower’s model number (e.g., 11A-B0BL723) and engine brand—this carb fits Troy-Bilt TB100 mowers with Briggs & Stratton or MTD engines, typically 140cc to 190cc. Measure the mounting bolt spacing (usually 2.5 inches center-to-center) and check the carburetor gasket shape matches your intake manifold. This is an aftermarket part, not OEM Troy-Bilt or Briggs & Stratton, so confirm your OEM part number (e.g., 699764 or 593471) is listed as compatible. Inspect your old carb’s fuel line diameter (3/16” is common) and ensure the included air filter cover aligns with your mower’s mounting tabs.

Key Things to Know

• Quality varies: Most users report it works out of the box, but some need minor gasket trimming or adjustment of the idle screw (turn clockwise to raise idle if it stalls).
• Installation difficulty: Moderate—requires removing the air filter housing, unscrewing two bolts, disconnecting fuel line and throttle linkage, then reversing. Expect 20–30 minutes.
• Common gotcha: The included air filter may be slightly smaller than OEM; check it seats snugly or reuse your old filter if it’s clean.
• Fuel line tip: Old fuel lines can be brittle—have a short length of 3/16” fuel line on hand if yours cracks during removal.

Should You Buy It

If your TB100 mower starts hard or runs rough due to a gummed carburetor, this is a cost-effective fix (under $25) versus a $50+ OEM replacement. It’s best for DIYers comfortable with basic engine work and willing to make minor adjustments. Skip it if you want exact OEM fit or have a non-standard engine (e.g., Honda or Kawasaki).