Seller notes

Yamaha® YFZ™ 450 2004-2009Yamaha® YFZ™ 450X 2008-2011Yamaha® YFZ™ 450R 2009-2023Yamaha® YFZ™ 450SE 2010-2023Since 1939, KPMI® has taken great pride in our ability to design innovative performance improvements for valvetrains. This innovative ability has never been more apparent than with the development of the high tech lightweight racing valve spring kits for the incredibly stressed and torturous environment in today's high revving 4-stroke engines.The challenge to engineer a valve...

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