Hoypeyfiy Air Cleaner Cover 595660, Foam Filter 799579, and Primer Bulb 594281 Replacement Kit Compatible with BS 550E / 550EX Engine Series Lawn Mowers

What It Is

This three-piece replacement kit includes an air cleaner cover, foam filter, and primer bulb specifically designed for Briggs & Stratton 550E and 550EX engine series lawn mowers. It restores proper air filtration and primer function on mowers with these small single-cylinder engines.

Fitment & Compatibility

Check your engine model number—this kit fits BS 550E and 550EX series engines only, not 500E, 575EX, or other variants. Look for the model number stamped on the engine shroud (near the spark plug or valve cover). The air cleaner cover (595660) and foam filter (799579) are direct replacements for OEM parts; the primer bulb (594281) replaces the original push-in bulb on the carburetor. No deck size or brand restrictions—fitment depends entirely on the engine, not the mower brand (Toro, Craftsman, MTD, etc.). Measure the air cleaner cover mounting holes (approx. 3.5 inches center-to-center) and the foam filter diameter (about 3 inches) to confirm match.

Key Things to Buy

• Quality is acceptable for the price—the plastic cover feels slightly lighter than OEM but snaps on securely. The foam filter is dense enough for basic dust filtration. The primer bulb may be slightly stiffer than original.
• Installation is straightforward—remove the old cover and filter, clean the housing, then snap the new cover on. For the primer bulb, carefully pry out the old one and press the new one into the carburetor hole. No tools needed.
• Common gotcha: the primer bulb may not seat perfectly if the carburetor grommet is old or cracked. Inspect the grommet before installing; if it’s brittle, replace it separately.
• Not for high-debris conditions—the foam filter is washable but not suitable for heavy dust or grass clippings. Consider a paper filter upgrade if you mow in dirty environments.

Should You Buy It

If you have a 550E or 550EX engine and need a quick, cheap fix for a missing or damaged air cleaner or a non-working primer bulb, this kit works fine. It’s not premium quality, but for $7.89 and a 4.6-star rating, it’s a solid budget option for basic maintenance. Skip it if you need exact OEM fit or operate in heavy dust—then buy genuine Briggs & Stratton parts.