K&N RC-2454 Universal Clamp-On Oval Air Filter (1.75" Flange, 4.0" x 2.875" Base

Vehicle Fitment

• Universal / custom intake systems - not vehicle-specific

Fitment Notes

• Clamp-on filter - attaches to intake tubes or carb throats with ~1.75" (44 mm) inside-diameter flange
• Not a stock OEM airbox replacement - verify flange size and clearance before installation
• Often used for vintage motorcycles or custom builds (e.g. 1970s-1980s Kawasaki, Suzuki, Honda classics)

Features

• High-flow cotton-gauze media for improved airflow and engine breathing
• Pleated design gives large filtration surface for low restriction and long service intervals
• Washable & reusable - reduces long-term maintenance and replacement costs
• Pre-oiled and ready to install out of box
• Flexible molded rubber flange absorbs vibration and enables secure clamp-on fit
• Compact oval shape suitable for tight engine-bay spaces
• Chrome top cap for durability and classic look
• Reliable filtration even under dusty or off-road conditions

Specifications

• Filter Shape: Oval / Straight Clamp-On
• Base Outside Length: 4.00 in (102 mm)
• Base Outside Width: 2.875 in (73 mm)
• Flange Inside Diameter: 1.75 in (44 mm)
• Flange Length: 0.625 in (16 mm)
• Flange Offset: 0.5 in (13 mm)
• Filter Height: 2.75 in (70 mm)
• Top Outside Length: 3.0 in (76 mm)
• Top Outside Width: 2.0 in (51 mm)
• Filter Media: Cotton gauze
• Washable / Reusable: Yes
• Package Quantity: 4 filters per box

Included Components

• 4 x K&N RC-2454 Oval Clamp-On Air Filters (pre-oiled, ready for installation)

Product Description

The KC-2454 Universal Clamp-On Oval Air Filter from K&N is a versatile, high-flow air filter designed for custom intakes, vintage motorcycles, and bikes that don't use a standard OEM airbox. With its 1.75" clamp-on flange and compact oval footprint (4.0" x 2.875" base), it's ideal for tight engine-bay configurations - particularly on classic or modified bikes where space is limited. The pleated cotton-gauze media delivers strong filtration while maintaining excellent airflow, helping the engine breathe better under both street and off-road conditions.

Because the filter is washable, reusable, and comes pre-oiled, the RC-2454 offers long-term value over disposable filters. Its flexible rubber flange ensures a secure clamp-on fit even under vibration, and the pleated design maximizes dust-holding capacity for longer service intervals. This makes it a good choice for riders restoring older motorcycles, building custom intake systems, or operating in dusty environments where filtration and airflow balance is critical.