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Moto Tassinari V-Force 3 Reed Valve System for Yamaha SX Viper - V3141-682A-3 2013 Honda TRX420TM 1971 Harley-Davidson Sportster - XLMoto Tassinari V Force 3 Reed Valve System Part Number: V3141 682A 3 Double the reed tip surface over a conventional reed valve design Increased bottom end, stronger mid range and longer top end Greater efficiency due to reduced reed petal travel More airflow means more horsepower Reduced reed petal wear Screw free design eliminates risk of screws going through motor Screw free design enables super quick reed petal changes The unique design of the