Overview
Rebuilding a gummed-up carburetor can be tedious and uncertain. This brand-new aftermarket unit drops onto your engine in place of the original, giving you fresh gaskets, clean jets, and proper fuel metering from the first pull. A practical solution when the old carb is beyond cleaning.
Key specifications
- Type: complete replacement carburetor
- Condition: new, pre-assembled
- Material: die-cast aluminum body
- Includes: mounting gaskets
Compatibility
Compatible with Troy-Bilt TB22TM Trimmer Mower 25A-26SD766 and related models. Always verify the OEM part number in your owner’s manual against the compatibility list to ensure this replacement will work on your specific machine.
Installation notes
Shut off the fuel valve and disconnect the spark plug wire. Remove the air cleaner assembly and detach the throttle and choke linkages from the old carb. Unbolt it from the engine and scrape the old gasket material from the intake. Mount the new carb with the included gasket, reattach all linkages and the fuel line, and reinstall the air filter. After starting, adjust the idle speed to spec.
Common questions
Q: Will this carburetor fit my Troy-Bilt TB22TM Trimmer Mower, model 25A-26SD766, if it originally used Briggs & Stratton carburetor 799866?
Yes, this carburetor is intended as a replacement for the Troy-Bilt TB22TM Trimmer Mower model 25A-26SD766 and matches Briggs & Stratton part numbers 799866 and 594593. It’s still a good idea to compare the mounting pattern, linkage connections, and fuel line routing on your original carb before installation.
Q: My TB22TM with engine carb 594593 surges and only runs on choke—would replacing this carburetor likely fix that?
Those symptoms commonly point to a clogged or worn carburetor, especially if fuel has been sitting in the machine. Replacing the carburetor often resolves hard starting, surging, and choke-only running, but you should also inspect the fuel lines, primer system, air filter, and use fresh gasoline so the new carb can perform properly.
Q: Do I need to adjust this carburetor after installing it on a Troy-Bilt TB22TM 25A-26SD766, and what maintenance helps it last longer?
Most replacement carburetors for this application are installed as a direct swap with little to no adjustment beyond reconnecting the throttle linkage, gaskets, and fuel lines correctly. To extend service life, drain old fuel before storage, use clean fresh gasoline, and keep the air filter clean so debris and varnish don’t cause repeat carburetor problems.
