K&N Oil Filter KN-140 - Yamaha YZ250F-450F / WR250F-450F

Overview

The K&N KN-140 Oil Filter is built to protect high-revving Yamaha motors with race-proven filtration and consistent oil flow. Designed for YZ250F/450F and WR250F/450F models, this filter uses synthetic media to trap 99% of contaminants while ensuring reliable oil pressure in all riding conditions—from track days to trail runs.

With K&N’s signature performance and durability, this filter is trusted by weekend warriors and race teams alike.

Key Features

• High-Flow Synthetic Media: Maintains strong oil circulation while filtering 99% of contaminants
• Race-Ready Construction: Built to handle the heat and pressure of competition
• Oil Compatibility: Works with conventional, synthetic blend, and full synthetic oils
• Pressure Relief & Anti-Drain Back Valves: Engine protection during cold starts and extreme conditions (where applicable)

Exact Fitment

• Yamaha YZ Models: YZ250F / YZ450F
• Yamaha WR Models: WR250F / WR450F
• Check Fitment Guide For Your Model.

Protect your Yamaha’s powerplant with the proven performance of the K&N KN-140 oil filter—made for riders who push it.