COMPLETE MOTOR REBUILD KIT FOR ALL'06-09 YZ450F DIRT BIKES! CP or Wiseco hi comp pump gas forged piston. Water pump mechanical seal and bearing. This is a bolt on kit with no machining required.Piston uses pump or race gas. WE ARE HERE TO HELP!!! We recommend that this kit be installed by a qualified mechanic with experience working on these types of motors. The item "YZ450F YZ 450F Big Bore Kit Complete Motor Engine Rebuild Rebuilt Repair 06-09" is in sale since Friday, May 26, 2017. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Big Bore & Top End Kits". The seller is "bpracingatv" and is located in Upland, California. This item can be shipped worldwide.