Briggs & Stratton

What It Is

This is a genuine Briggs & Stratton replacement air filter (part number 491588S) designed for small engines on lawn mowers, tractors, and zero-turn riders. It traps dirt and debris before they enter the carburetor, ensuring clean airflow for combustion.

Fitment & Compatibility

• Engine models: Fits Briggs & Stratton single-cylinder engines with Intek, ELS, or Quattro series (common on 500cc–725cc engines). Check your engine’s model number (stamped on the valve cover or blower housing) against the 491588S fit list.
• Deck size: Not deck-specific; compatibility depends on the engine, not the mower deck.
• OEM vs aftermarket: This is a genuine Briggs part—avoid cheap knockoffs that may not seal properly. Aftermarket versions (e.g., Stens, Oregon) often use different foam density.
• Measurement: Filter dimensions are roughly 7.5" x 5" x 1.5". Measure your old filter’s mounting slot to confirm it’s the same shape (rectangular with a central hole).

Key Things to Know

• Quality: Pre-oiled foam element—do not wash or reuse; replace annually or after 50 hours of heavy use.
• Installation: Easy—remove the air cleaner cover, swap the old filter, and secure the cover. No tools needed.
• Common gotcha: If your engine has a pre-cleaner (foam wrap), buy that separately (Briggs part 491588S does not include it). Also, check the rubber gasket on the cover—cracked gaskets let unfiltered air in.
• Price: $21.99 is fair for OEM; aftermarket versions are $8–$12 but may degrade faster in dusty conditions.

Should You Buy It

Buy this if you want a guaranteed fit and reliable filtration for a Briggs Intek or similar engine. It’s a straightforward swap with no guesswork, ideal for homeowners who mow 1–2 acres weekly. Skip it if your engine is a different brand (e.g., Kohler, Kawasaki) or if you prefer a cheaper aftermarket filter for light use on a small yard.