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Namura Hyperdryve Top-End Rebuild Kit for 2014-19 Yamaha YZ450F - 97.00mm - NX-40048-CK MPN_C7755 2010 Yamaha YFM700 Grizzly FINamura Technologies Top End Rebuild Kit A Top End rebuild can help to improve the performance of your ride, keeping it running in peak condition. With the Namura complete Top End Rebuild Kit, rebuilding your Top End no longer expensive and painful Namura's Top End Kits include everything you need to get your ride operational again; pistons, a top end gasket kit and wrist pin bearings (where applicable) are all included in this convenient, time saving