Air Filter Replacement Foam Cleaner Kit for Small Engine Lawn Mowers, Compatible Replacement Part, Includes Spark Plug, Replaces 799579 5434 4248

What It Is

This is a budget-friendly air filter replacement kit for small engines (typically 125cc–200cc), bundled with a spark plug. It’s designed for routine maintenance on push mowers, trimmers, and other handheld or walk-behind equipment.

Fitment & Compatibility

Before buying, check your engine’s OEM part numbers: this kit claims to replace 799579, 5434, and 4248. These numbers are most common on Briggs & Stratton, MTD, and Cub Cadet engines (e.g., 450–550 series). Measure the foam filter’s outer dimensions – it should be roughly 2.5” x 1.5” x 1” – and confirm the spark plug gap (typically 0.030” for small engines). If your mower uses a paper air filter, this foam-style won’t fit. Also verify that the included spark plug is the correct thread length (3/4” reach) and heat range for your engine.

Key Things to Know

• Quality vs. OEM: The foam filter is washable and reusable but less durable than OEM paper filters. The spark plug is a standard copper-core – fine for seasonal use, not for extended heavy duty.
• Installation: Very easy – remove old filter, clean housing, insert new foam, and replace spark plug with a 5/8” socket. No special tools needed.
• Common gotcha: The foam filter may be slightly oversized for some housings – trim it with scissors for a snug fit. Also, don’t over-oil the foam (if pre-oiled) – excess oil can foul the carburetor.
• Bundle value: At $5.99, this kit costs less than a single OEM filter or spark plug separately, making it a cheap way to refresh both items at once.

Should You Buy It

Buy this if you need a quick, no-fuss maintenance kit for a small lawn mower or trimmer, and you’re okay with a generic foam filter that works fine for light use. Skip it if you want a paper filter, a long-life iridium spark plug, or OEM-specific fitment for a high-end mower.