Boyesen PRO-218 Pro Series Carbon Fiber Reed Kit

The Boyesen PRO-218 Pro Series Carbon Fiber Reed Kit is a dual-stage reed set for 2-stroke engines, pairing a carbon fiber top reed with a fiberglass/epoxy bottom reed to optimize airflow and throttle response. Replacement reeds are packaged as cylinder sets, with one set required per cylinder, simplifying upgrades on single- or multi-cylinder machines. Major retailers commonly list PRO-218 as compatible with Yamaha YZ250 and YZ250X motorcycles, with model-year coverage that varies by listing—from the mid-2000s through the mid-2020s depending on the source—and the kit is identified by the manufacturer as PRO-218. The Pro Series designation signals Boyesen’s carbon fiber technology approach to reed petals, designed to deliver responsive performance in demanding riding conditions while maintaining durability. Technical notes describe the top carbon fiber reed providing stiffness and precision while the bottom fiberglass/epoxy reed provides support, contributing to a reed system that responds to piston-speed changes across the RPM range.