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New Part Part Number: CST-1423:16 Description: Supersprox front sprocket 16 tooth Suggested Fitments: GSX-R1000 K9+ with 520 conversion 2009-2012 GSX-R1300 Hayabusa GSX-1340 Hayabusa 2008-2012 with 520 conversion GSX-1340 B-King 2008-2012 with 520 conversion ///Motomike