Boyesen 6107 Power Reed For: Arctic Cat 90 2002-2005; Bombardier DS90 2005-2006; E-TON 70 2005-2007; E-TON 90 2001-2007; Kasea 90 2001-2004; Polaris 1990 2001-2006; Polini 50 (2 petal) 1999-2004 Power reeds use a patented dual stage fiberglass design for more air flow, more air velocity and more power The top reed is lightweight and resilient for crisp throttle response at partial throttle or low RPMs; the stiffer, bottom reed is ported to provide maximum flow and horsepower at higher RPMs Longer overall life: Boyesen power reeds outlast all other aftermarket reed petals Minor change gives major horsepower improvements and fuel economy