796031 590825 594201 591334 Air Filter Fits B&S troy bilt pony parts 4243 5421 5428 5428H 5428K and Johndeere GY21435 MIU13038 MIU13963 MIU14395 (1 Pack)

What It Is

This is a replacement air filter for small engines, typically used in walk-behind lawn mowers and riding tractors from brands like Briggs & Stratton, Troy-Bilt, and John Deere. It fits engines with model numbers 796031, 590825, 594201, and 591334, and is designed to trap dirt and debris before they enter the carburetor.

Fitment & Compatibility

Before buying, confirm your engine’s model number—not just the mower brand. This filter is a direct fit for Briggs & Stratton engines on Troy-Bilt Pony models 4243, 5421, 5428, 5428H, 5428K, and John Deere parts GY21435, MIU13038, MIU13963, MIU14395. It’s an aftermarket replacement, not OEM, but matches the original dimensions (roughly 3.5 x 2.5 x 1.5 inches). Check your current filter’s shape—it’s a rectangular foam-and-paper element, not a round or cylindrical type. If your engine uses a different part number (e.g., 691031 or 490-120-M021), this won’t fit.

Key Things to Know

• Quality: At $7.77, it’s a budget-friendly aftermarket option. Most users report it works as well as OEM, but a few note slightly thinner foam. Inspect the seal before installing.
• Installation: Simple—remove the old filter, clean the housing with a rag, and drop in the new one. No tools needed. Takes under 2 minutes.
• Gotcha: This is a single pack. If your mower uses two filters (some larger engines do), you’ll need to buy two. Also, it’s not washable—replace it every 25 hours or once a season.
• Common issue: The foam may compress slightly over time, so check fitment after first use. If it’s loose, the housing won’t seal properly.

Should You Buy It

If you need a quick, cheap replacement for a common B&S or Troy-Bilt mower engine, this is a solid choice. It’s not premium, but for the price and 4.7-star rating, it’s reliable for regular lawn care. Skip it if you prefer OEM parts or have a high-hour commercial mower.