The latest carbon fiber technology with all the advantages of Boyesens patented dual-stage reed design. Utilizes a carbon fiber top reed and a durable fiberglass/epoxy bottom reed. Offers the quickest acceleration any reed can offer; maximizes horsepower and torque. Responds quickly and accurately to changes in piston speed for smooth dependable throttle response. No sacrifice in reed life like traditional carbon fiber reeds. Designed for the newest 2-stroke technologies. This item fits H-D the following vehicle applications: fits YAM YZ80 1993-2001