OLIFANT Air Filter Set for Kohler 16–26 HP Engines — 2 Inner + 2 Outer Replacement (Fits 25-083-01S / 25-083-04-S)

OLIFANT replacement air filter sets provide two inner and two outer filters designed to fit Kohler engines (16–26 HP) to keep intake air cleaner and maintain engine performance.

If your small engine uses Kohler part numbers 25-083-01S and 25-083-04-S (also cross-referenced to Wix 46438 and 42985), this OLIFANT pack delivers matched inner and outer elements for dependable filtration. The set covers a broad range of Kohler models — CH18–CH26, CV16–CV26, CH730–CH750, CV740/CV745 and LH/LV series — and is made from quality filter paper engineered to trap dust and debris before it reaches the carburetor and combustion chamber.

Which engines and part numbers does this filter set fit?

This OLIFANT set is compatible with many Kohler engines in the 16–26 HP range and replaces the referenced OEM and aftermarket part numbers.

• Fits Kohler models: CH18–CH26, CV16–CV26, CH730–CH750, CV740, CV745, LH640, LH685, LH690, and related LV/LH ranges.
• Replaces Kohler part numbers 25-083-01S (outer) and 25-083-04-S (inner).
• Cross-references Wix 46438 and 42985 for aftermarket compatibility.
• Intended for 16 HP to 26 HP small engines commonly found on mowers, generators, and utility equipment.

How do these inner and outer filters improve engine operation?

The two-stage configuration traps larger particles with the outer element and finer dust with the inner element, reducing contamination of internal parts and helping the engine breathe more efficiently.

• Outer filter captures leaves, debris and coarse dust before it reaches the inner element.
• Inner filter uses pleated filter paper for finer particle retention.
• Combined filtration minimizes air-path clogging and supports consistent performance.
• Replacing both elements as a set ensures the designed airflow and protection levels are restored.

What are the materials and package contents?

The OLIFANT set contains two inner and two outer air elements made from high-quality pleated filter paper and molded end caps for a secure fit and consistent sealing.

• Contents: 2x inner air filters, 2x outer air filters — ready for twin-filter applications or two maintenance cycles.
• Filter medium: durable pleated filter paper engineered for effective dust capture.
• Construction: molded ends and uniform pleats for reliable sealing and even airflow distribution.
• Packaged to prevent deformation during storage and shipping.

When should I replace these filters and how do I install them?

Replace filters according to your engine’s maintenance schedule or sooner in dusty conditions; installation is straightforward and requires no special tools.

• Inspect at each oil change and replace when visibly dirty, torn, or after heavy seasonal use.
• Remove the airbox cover, take out the old inner and outer elements, and insert the new outer first, then the inner (or follow the engine manual order).
• Ensure proper seating and a tight airbox seal to prevent unfiltered air bypass.
• Dispose of used filters according to local regulations; store spares in a dry place.

Who is this for: This OLIFANT 2-set air filter kit is designed for owners, technicians and fleet managers who maintain Kohler-powered lawn mowers, generators, pressure washers and other small engines in the 16–26 HP range. It’s best for anyone who wants OEM-equivalent replacements (Kohler 25-083-01S/25-083-04-S) or Wix-compatible elements (46438, 42985) in a ready-to-install two-inner/two-outer pack for routine maintenance or seasonal overhaul.