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Moto Tassinari V-Force 4 Reed Valve System for KTM 250 / 300 - V417A 1994 Honda TRX300FW FourTrax 2010 Yamaha YFM550FGH Grizzly FIMoto Tassinari V Force 4 Reed Valve System Part Number: V417A Reed petal resin system, carbon fiber and lay up Pre curved reed petal ensures better seal at tip Wider reed cage for maximum airflow Combined reed tip area increased by 10. 5% resulting in increased total air flow Airfoil shape added to cage tip to increase air velocity from outer ports Long reed stops added to progressively slow petal tip velocity, for increased petal durability Reduced