16-18 YAMAHA YXZ1000R: Genuine Yamaha Accessories Foam Air Filter The GYTR&reg; Multi-Stage Foam Air Filter has a special two-stage design for maximum airflow and superior filtration for greater engine protection.Service with Yamalube&reg; Bio-degradable Foam Air Filter Oil and Cleaner Kit (P/N ACC-BIFMF-LT-KT; sold sep