593260 Air Filter and Spark Plug for B&S 725EX 625EX 575EX 550EX 525EXI Engines, compatible with Troy-Bilt TB110 TB115 TB200 TB230 TB330 TB370 Lawn Mower

What It Is

This is a combo kit containing an air filter and spark plug designed for Briggs & Stratton 725EX, 625EX, 575EX, 550EX, and 525EXI engines. It’s intended for routine maintenance on Troy-Bilt walk-behind mowers like the TB110, TB115, TB200, TB230, TB330, and TB370, as well as other mowers using those same B&S engines.

Fitment & Compatibility

Before buying, confirm your mower has one of the listed B&S engines—check the engine model number stamped on the valve cover or blower housing, not just the mower model. This kit is not universal; it specifically fits the 725EX, 625EX, 575EX, 550EX, and 525EXI. Measure your current air filter (roughly 4.5 x 2.5 x 1.75 inches) and spark plug gap (0.030 inches for most B&S engines). The spark plug is pre-gapped in some kits, but verify with a feeler gauge. This is an aftermarket replacement, not OEM B&S, so it may differ slightly in fit or quality from the original parts.

Key Things to Buy

• Quality variance: Aftermarket filters may have less dense foam or looser seals than OEM B&S parts. Check for debris bypass after installation.
• Installation difficulty: Very easy—swap the air filter (remove cover, replace element) and replace the spark plug (use a 5/8-inch socket, gap to 0.030 inches if needed). Takes 10 minutes.
• Common gotcha: The spark plug may be slightly shorter or longer than OEM. If it doesn’t thread smoothly, stop and verify thread size (14mm x 1.25mm) and reach (19mm). Cross-threading can damage the cylinder head.
• Not a tune-up kit: This is just a filter and plug. You still need oil change and blade sharpening for a full service.

Should You Buy It

Buy this if you have one of the listed B&S engines and want a low-cost, quick maintenance set for a single season. It’s not for heavy-duty use or precision engines—expect average quality. For critical reliability or if you prefer exact OEM fit, spend a few dollars more on genuine B&S parts.