Athena 100mm 490cc Big Bore Cylinder Kit With CP Carrillo 13.5:1 Piston! This is the best and most reliable big bore kit on the market!Fits Honda TRX450R & TRX450ER. Years 2006 2007 2008 2009 2010 2011 2012 2013 2014. 100mm Nikasil Athena Big Bore Cylinder. CP Carrillo 13.5:1 Piston Kit (Includes, Piston, Pin, Rings & Clips) (Uses Race Gas ONLY). Athena Complete Top End Gasket Set. Larger Water Jackets Keep Your Motor Cooler! For the most reliability and longevity we recommend installing. This kit with a new OEM crankshaft or preferably with our CP Carrillo heavy. This kit must be installed by a qualified professional and dyno tuned. To ensure the proper AFR. Failure to adhere to our recommendations can lead to. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Engines & Engine Parts\Complete Cylinders". The seller is "azquadparts" and is located in this country: US. This item can be shipped worldwide.