Boyesen Power Reeds Yamaha YZ125 Single reed petals can't handle the abuse of 2-stroke engines, especially at peak RPM. Boyesen's dual-stage reed design, featuring one soft reed on top of a firm flow-through reed, delivers superior power across a wide RPM range. This innovative design enhances intake control and velocity, resulting in quicker acceleration, crisper throttle response, and increased horsepower. Replace your stock reeds with Boyesen's dual-stage reeds for unmatched performance throughout the powerband.