Part no. RHK-0.3.06 Fitment: Yamaha YZ 125 1987-1988 Yamaha YZ 250 1987 Yamaha YZ 490 1987-1988 RHK Filters are designed and manufactured to increase airflow whilst ensuring the ultimate level of protection. RHK Filters consist of an outer layer of coarse open-pore foam which catches large dirt, grime and sand particles. The 2nd inner layer of fine open-pore foam aids in catching minute & finer particles whilst delivering maximum air flow.