Air Filters Replace for 796031 591334 or 594201 Plus 797704 Foam Pre-cleaner

What It Is

This is a set of replacement air filters (part numbers 796031, 591334, 594201) plus a separate foam pre-cleaner (797704) for small engines, typically on walk-behind mowers, tractors, and zero-turns. The paper filter traps fine dust, while the foam pre-cleaner catches larger debris and extends the paper filter’s life.

Fitment & Compatibility

Before buying, match your machine’s model and engine type. These fit many Briggs & Stratton, Craftsman, Husqvarna, and MTD mowers with 500–700 series engines (e.g., 6.75–12.5 ft-lbs gross torque). Measure the paper filter: approximately 5.75” long x 3.5” wide x 2” thick; the foam pre-cleaner is about 5.5” x 3.5” x 1.5”. Cross-check your OEM part numbers: 796031, 591334, or 594201 for the paper filter, and 797704 for the foam. Not compatible with Kohler, Kawasaki, or Honda engines unless listed in the fitment guide. Verify deck size isn’t a factor—fit is engine-specific, not deck-dependent.

Key Things to Buy

• Quality: These are aftermarket but match OEM specs; users report good sealing and no air leaks. Foam pre-cleaner is oiled (re-oil after washing).
• Installation: Easy—remove the air filter cover, swap the paper filter, and slide the foam pre-cleaner over it. No tools needed.
• Gotchas: The foam pre-cleaner is separate; don’t skip it if your mower originally had one. Over-oiling the foam can cause misfires—squeeze out excess.
• Maintenance: Clean the foam every 25 hours (or after dusty use) and replace the paper filter annually or when visibly dirty.

Should You Buy It

If you need a budget-friendly, reliable replacement for these common Briggs & Stratton engine filters and want the extra debris-catching benefit of a foam pre-cleaner, this is a solid pick. Ideal for homeowners with one or two mowers who change filters seasonally. Not for pros needing OEM-only parts or for rare engine models.