Athena 102mm 500cc Big Bore Cylinder Top End Kit! This is the best and most reliable big bore kit on the market!Fits Yamaha YZ450F Dirt Bikes. Years 2010 2011 2012 2013 2014 2015 2016 2017. 102mm 500cc Nikasil Athena Big Bore Cylinder. Larger Water Jackets For Better Cooling! Athena 102mm Coated Piston Kit (Includes, Piston, Pin, Rings & Clips) 12.3:1 Compression. Athena Complete Top End Gasket Set. It will work with your stock head and valves. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle & Scooter Parts & Accessories\Engines & Engine Parts\Engine Rebuild Kits & Components". The seller is "azquadparts" and is located in this country: US. This item can be shipped worldwide.