01-13 YAMAHA YZ250F: Boyesen Clutch Cover (MAGNESIUM) Set your bike apart from the rest with the ultimate look in race performance. Over the years, top riders like Barry Hawk, Randy Hawkins and Mike Lafferty, have all helped to make the Factory Racing brand of clutch covers a recognizable part of off-road history that still lives on today. Add style and the Factory look to your bike with a Boyesen Factory Clutch Cover. Exterior grade, UV-resistant powder coat finish is available in three classic colors, as well the new factory matte orange to perfectly match KTMs. Made from investment-cast aluminum, the Factory Cover is strong, lightweight, and durable providing years of outstanding protection.