Brand New Complete Top End Athena / CP 480cc Big Bore Kit (Pump Gas Kit). This is the most reliable big bore kit on the market! This kit uses only the best components available! Fits Honda TRX450R Years 2004 and 2005. Larger Water Jackets For Superior Cooling!CP 12:1 Piston Kit (Includes Piston, Rings, Pin, & Clips). Athena Complete Top End Gasket Kit. This is a bolt on kit with no machining required. It will work with your stock head and valves. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Engines & Components". The seller is "azquadparts" and is located in this country: US. This item can be shipped worldwide.