- Big Bore Kit
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08-21 Kawasaki KLX450 KLX 450 100 490cc Athena Big Bore Top Cylinder Piston Kit
Athena 100mm 490cc Big Bore Cylinder Top End Kit! This is the best and most reliable big bore kit on the market! Fits Kawasaki KLX450 Dirt Bikes. Years 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021.
100mm 490cc Nikasil Athena Big Bore Cylinder. Athena 100mm 12:1 Piston Kit (Includes, Piston, Pin, Rings & Clips). Athena Complete Top End Gasket Set. Larger Water Jackets To Keep The Motor Cooler. This is a bolt on kit with no machining required. It will work with your stock head and valves.