Briggs & Stratton air filter & precleaner kit 5428K — OEM paper element + foam precleaner, direct-fit

The Briggs & Stratton 5428K is an OEM air filter and precleaner kit that fits specified small-engine lawn mowers to help stop dust and debris from reaching the engine.

This genuine Briggs & Stratton replacement set is built to the manufacturer's specifications, offering a direct-fit option for compatible engines. It includes both the main filter element and a precleaner to extend filter life and maintain airflow. Before buying, confirm your engine model or replacement part number to ensure proper fit: compatible engines include 31R875, 31R877, 31R907, 31R977, 40N877, 40R677, 44R877, and 49J677.

What components come in the 5428K kit and why do they matter?

The 5428K package contains the primary paper filter element plus a foam precleaner. Together they create a two-stage defense: the precleaner captures larger particles and the main filter traps finer dust, which helps preserve engine parts and maintain consistent airflow. Using both parts as intended can lengthen intervals between full filter replacements.

• Paper element sized to OEM dimensions for consistent sealing
• Foam precleaner that reduces heavy-dust buildup on the main filter
• Direct-fit design for straightforward installation without modification

How do I know if the 5428K fits my mower engine?

Check the engine model number stamped on your engine housing or your mower’s owner manual and compare it to the list of compatible engines. You can also match the old filter's part number to the replacement part numbers shown for this kit. If your engine model or part number appears in the compatibility list, the 5428K is the correct OEM replacement.

• Locate your engine model on the mower housing or manual
• Compare with: 31R875, 31R877, 31R907, 31R977, 40N877, 40R677, 44R877, 49J677
• Match the prior replacement part number when possible for confirmation

How do I install and maintain the air filter and precleaner?

Installation is typically simple and requires no tools beyond basic hand access: remove the air cleaner cover, take out the old parts, and seat the new precleaner over the paper element or housing as designed. Inspect the filter regularly, especially after dusty work; replace the paper element when it’s dark with dirt or damaged, and clean or replace the foam precleaner if it’s clogged or torn.

• Remove cover and existing filter; discard old parts properly
• Fit foam precleaner and paper element in correct orientation
• Reinstall cover and check for secure seal to prevent unfiltered air entry

Will this filter improve engine performance and longevity?

While no single part guarantees outcomes, using the correct OEM air filter and precleaner helps maintain designed airflow and reduce abrasive particles entering the engine. Consistent filtration supports steady combustion, reduces wear on internal components, and helps equipment run closer to factory specifications over time.

• Helps maintain consistent air supply for efficient combustion
• Reduces abrasive dust reaching cylinders and valve components
• OEM fit minimizes intake leaks that can affect engine operation

Who is this for: The Briggs & Stratton 5428K is intended for homeowners and landscapers who own lawn mowers or equipment with the compatible Briggs & Stratton engine models and who want a genuine OEM replacement. It’s useful for routine seasonal maintenance or as a spare on-hand part for those who perform their own small-engine upkeep.