2 Pack 798897 Air Filter, Compatible with 49M977 49L977 44Q977 44P977 Engine Lawn Mower 794935 592496 Cyclonic Air Cleaner

What It Is

This is a 2-pack of replacement air filters designed for the Cyclonic Air Cleaner system on high-end residential and commercial walk-behind mowers. It protects the engine from dust and debris by trapping particles before they enter the carburetor or intake, critical for mowers operating in dusty or mulching conditions.

Fitment & Compatibility

Before buying, verify these three things:

1. Engine model – This filter fits Briggs & Stratton engines with the Cyclonic Air Cleaner system, specifically models 49M977, 49L977, 44Q977, and 44P977. Check your engine’s model number (stamped on the valve cover or blower housing).
2. Air cleaner assembly – It replaces OEM part numbers 798897, 794935, and 592496. If your mower uses a standard flat foam filter or a paper cartridge, this will not fit.
3. Physical check – The filter is roughly 4.5 x 3.5 inches with a pre-formed foam shape. Measure your existing filter or the air cleaner housing opening to confirm it matches.

Common compatible mower brands – Toro (TimeCutter, Titan, GrandStand), John Deere (Z525E, Z535M), and Cub Cadet (ZT1, ZT2) with the Cyclonic system. Not universal—double-check your deck size is irrelevant here; it’s engine-dependent.

Key Things to Know

• Quality vs OEM – This is an aftermarket replacement, not genuine Briggs & Stratton. Users report it fits snugly and filters well, but expect slightly less dense foam than the original. For heavy commercial use, OEM may last longer.
• Installation difficulty – Very easy. Remove the air cleaner cover, pull out the old filter, drop in the new one (foam side facing the engine), and reattach the cover. No tools required.
• Common gotcha – The Cyclonic system has a pre-cleaner cup that collects large debris. Empty that cup before installing the new filter—if it’s full, the new filter will clog faster.
• Pack of 2 – With two filters, you get one spare. Replace every 25–50 hours or when the foam looks darkened/compressed. More often in dusty conditions.

Should You Buy It

If you own a mower with the Briggs Cyclonic Air Cleaner system and want a budget-friendly replacement that works well for residential or light commercial use, this 2-pack is a solid buy. It’s not the absolute best for heavy-duty daily commercial cutting (OEM lasts longer), but for most homeowners and part-time pros, the price and performance are right.