FITS ALL'01-05 YAMAHA RAPTOR 660 MODELS! Used set of OEM crankcases in excellent condition. CP CUSTOM 11:1 forged piston.Hotrods 4mm stroker crank with rod. Water pump mechanical seal and bearing. No mods of any kind are required to use this kit and piston runs on pump or race gas. We recommend that this be installed by a qualified mechanic with experience doing this type of work. Piston comes with specific instructions for setting ring gap. Failure to follow these exactly will result in motor failure. The item "Raptor 660 Cases Big Bore Stroker Motor Engine Top Bottom Complete Rebuild Kit" is in sale since Wednesday, February 6, 2019. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Engines & Components". The seller is "bpracingatv" and is located in Upland, California. This item can be shipped worldwide.