K&N Racing Oil Filter Kawasaki ZX-6R / 636 / RR (2007-2026) KN-303

When engine protection genuinely cannot be compromised — on track, in qualifying, or during a hard road blast — the K&N KN-303 Racing Oil Filter is the specification-grade choice for Kawasaki ZX-6R, 636, and ZX-6RR riders. Purpose-engineered for racing applications, it pairs a high flow rate with outstanding filtration efficiency, and it carries the one feature circuit regulations demand: a safety-wire drilling.

Key Features

• Safety-wire drilling built into the casing — satisfies mandatory track regulations without modification, making this filter paddock-ready straight out of the box.
• 17 mm hex head allows removal with standard workshop spanners; no filter-specific tool or strap wrench needed in the garage or on the grid.
• Anti-drain-back valve prevents oil from draining back to the sump between starts, eliminating the dry-start wear that shortens engine life on heavily used track machines.
• New over-pressure relief valve regulates oil pressure under load, preventing pressure spikes that can compromise bearings and seals.
• Casing walls are 50% thicker than a conventional filter, providing the structural rigidity needed when the engine is working hard and oil temperatures are elevated.
• Reinforced baseplate with a double-rolled seam gasket locks the seal under vibration, cutting the risk of leaks during sustained high-rpm use.
• Advanced synthetic filter media delivers high filtration efficiency and is fully compatible with modern synthetic engine oils and race fuels.

Built for the Demands of Track Use

The KN-303 is not a road filter with a racing badge — it is designed from the ground up for the conditions found at circuit events. The 50% thicker housing withstands the mechanical and thermal stresses that build during back-to-back sessions, while the pre-installed O-ring speeds up between-session servicing so you spend less time in the pits. The synthetic filter medium handles the high flow demands of a free-revving supersport engine without sacrificing the particle-capture efficiency that protects precision-machined components.

Safety-Wire Compliance

Most track-day organisers and race series require safety-wired oil filters as a condition of entry. The KN-303 incorporates a dedicated safety-wire hole in the casing, so compliance is immediate — no drilling, no risk of structural damage, no last-minute scramble before scrutineering.

Race-Fuel Compatibility

The filter's synthetic media and sealing components are formulated to resist degradation from race fuels, which can attack conventional filter materials and compromise their integrity over time. This makes the KN-303 a reliable long-term fitment for machines running pump fuel on the road and race fuel at circuits.

Fitment & Compatibility

The K&N KN-303 is a direct-fit replacement oil filter for the following Kawasaki models:

• Kawasaki ZX-6R — 2007 to 2026
• Kawasaki ZX-6R 636 — 2007 to 2026
• Kawasaki ZX-6RR — 2007 to 2026

Specifications