K&N Motorcycle Oil Filter KN-303 — High-Capacity, High-Flow Durable Canister with 17mm Hex Nut

The K&N KN-303 is a high-capacity motorcycle oil filter built for heavy-duty durability and exceptional oil flow while protecting engines from harmful contaminants.

Designed specifically for powersports applications, the KN-303 uses a synthetic-blend filtration media that works with conventional, synthetic, and blended oils — including oils with high synthetic content used in racing. The canister is engineered for strength and longevity, and service-friendly features like a welded 17mm hex nut let you remove the filter quickly. K&N backs the product with a 1-year limited warranty and laboratory testing that verifies high flow rates, capacity, and burst resistance.

How does this filter improve oil flow for performance motorcycles?

The KN-303 is engineered to support elevated flow demands common in modern and high-performance motorcycle engines. Its media and internal design minimize restriction while maintaining filtration efficiency, helping to keep oil circulating freely under a variety of operating conditions.

• High-flow media maintains consistent oil delivery at higher RPMs and heat levels.
• Heavy-duty canister resists deformation that can impede flow.
• Laboratory-tested burst strength ensures reliable performance under stress.

Will the KN-303 work with my synthetic or blended motor oil?

Yes — the KN-303 is compatible with synthetic, petroleum-based, and blended lubricants. The synthetic-blend filtration element is designed to trap contaminants while remaining chemically stable with modern oil formulations, including high-concentration racing oils.

• Formulated media resists breakdown from synthetic additives.
• Suitable for mixed oil service intervals recommended by manufacturers.
• Removes most common engine contaminants without compromising oil chemistry.

How does the KN-303 simplify maintenance and replacement?

K&N built practical features into the KN-303 to speed service and reduce frustration. A welded 17mm hex nut allows quick wrench-off removal, and the robust canister and high capacity let the filter meet or exceed many recommended service intervals.

• 17mm welded hex nut for fast, secure removal with common tools.
• Heavy-duty shell minimizes risk of damage during installation or removal.
• High capacity reduces frequency of changes where longer intervals are specified.

Which motorcycles are compatible with this filter?

The KN-303 fits a wide range of powersports models from multiple manufacturers. K&N provides extensive vehicle compatibility, covering many modern Kawasaki and Honda motorcycles and several other powersports platforms across model years.

• Fits numerous Kawasaki models including Ninja, Z, Versys, Vulcan, and ZX series.
• Compatible with many Honda models such as CB400, CBR400, and NT400 variants.
• Designed for powersports applications where OEM-style spin-on filters are specified.

Who is this for? The K&N KN-303 is aimed at riders and mechanics who want a durable, high-capacity replacement oil filter that balances strong filtration with low restriction. It's a good choice for sportbikes, cruisers, and dual-sport machines that use synthetic or blended oils, owners following longer service intervals, and anyone who values quick, tool-friendly maintenance. If you need a robust spin-on filter with verified flow and burst performance for powersports use, the KN-303 is built to meet those expectations.