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Top End Kit Includes: Wiseco top end gasket kit Premium materials produce the best sealing technology available exceeding OEM standards Dedicated forging Superior strength/weight ratio utilizing Aerospace alloy Race proven designs Chosen by top race teams, in all forms of racing CNC machined Optimal cam shape and profile for peak HP and service life Premium top end needle bearing Precision machined, highest quality materials for strength and reduced friction High-performance ring set Extended life and sustained power Highest quality, alloy pin Consistently true and durable Pro-X This Item Fits the Following Applications:2011 Yamaha YZ250