FITS ALL YAMAHA RAPTOR 660 MODELS AND YEARS. NEW after market 102mm big bore cylinder. JE CP or Wiseco forged piston. Hotrods or Wiseco crank with rod. Crank/main bearings (one comes installed on crank).Complete gasket kit - head base exhaust case covers pump covers. Complete crankcase oil seal kit. This is a bolt on kit, ready to drop in with no machining required. Piston uses pump or race gas. If you have ANY issue with something you order from us PLEASE let us fix the problem before you leave feedback. We 100% guarantee we will find a reasonable solution to any problem. We want happy customers always. Please check your order thoroughly when receiving it. We recommend that this kit be installed by a qualified mechanic with experience working on these types of motors. Piston comes with specific instructions for setting the ring gap. If you do not follow these exactly your motor will fail. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Engines & Components". The seller is "bpratv" and is located in this country: US. This item can be shipped worldwide.