Wiseco Yamaha Rhino Grizzly Bottom End Gasket Kit A Young Man In Suit And Tie Running Towards The Camera With Burning. Wiseco's bottom end rebuild kits help save time and money for your dirt bike, ATV, or UTV bottom end rebuild. Available for many popular applications, these kits contain a crankshaft assembly, main bearings, and a bottom end gasket kit, all in one box under one part number. This Part Fits: Year Make Model Submodel 2002 2008 Yamaha YFM660F Grizzly 4x4 Base 2004 2007 Yamaha YXR66F Rhino 660 Base 2007 Yamaha YXR66F Rhino 660 Ducks Unlimited Base 2006 2007 Yamaha YXR66F Rhino 660 Exploring Edition Base 2006 2007 Yamaha YXR66F Rhino 660 Special Edition Base 2007 Yamaha YXR66F Rhino 660 Sport Edition Base