Twin Air Air Filter YZ125 97-21 YZ125X 20-21 YZ250 97-21 YZ250F 01-13 YZ250X 16-21 WR250F 01-02 WR/YZ400F 98-99 WR/YZ426F 00-02 YZ450F 03-09

This is where it all began. Over 40 years ago, the sandy, gritty soil of The Netherlands – and the resulting engine failures – proved that single-foam and paper filters gave riders air flow, but failed at protection. Twin Air’s breakthrough, fused-dual-layer design (now widely copied) combined performance and protection. The fused layers of open-pore foam and fine inner foam trap even the smallest particles. The new, rounder design boosts airflow. So do the minimized seams made possible by a revolutionary micro-gluing process: Shorter seams = more foam = more flow.