Athena 72mm 293 / 300cc Big Bore Cylinder Top End Kit! This is the best and most reliable big bore kit on the market! Fits Yamaha YZ250 (2 Stroke Dirt Bikes).Years 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019. 72mm 293cc Nikasil Athena Big Bore Cylinder. Athena 72mm Coated Piston Kit (Includes, Piston, Pin, Rings & Clips). Athena Complete Top End Gasket Set. This Kit Produces 44 Horsepower!
This is a bolt on kit with no machining required. It will work with your stock head and valves. The item "03-19 Yamaha YZ250 YZ 250 72mm 293 300cc Athena Big Bore Top Cylinder Piston Kit" is in sale since Thursday, December 6, 2018.This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Big Bore & Top End Kits". The seller is "azquadparts" and is located in Gilbert, Arizona. This item can be shipped worldwide.