S&S Cycle Crankcase - 3.937" Bore - Alternator Style - Wrinkle Black - Dyna FLY RACING C-Frame strap system holds braces

C-Frame strap system holds braces perfectly in place

2013 - YZ450F

Inner Shutter

Designed for year-round use

Includes set of adjustable straps and air pump

S&S Cycle Crankcase - 3.937" Bore - Alternator Style - Wrinkle Black - Dyna FLY RACING C-Frame strap system holds bracesFeatures 4. 125" bore crankcase can be used as a foundation for a custom engine or replacement for T111, T124, or T143 Stock looking, but stronger; thicker wall sections and superior 356 T6 aircraft grade aluminum Tough powder coat finishes Reinforced front motor mount for extra strength Timken sprocket shaft bearing Strong enough for the most demanding applications Clearanced for strokes up to 4 3 16" and cams up to 0. 720" lift Includes pinion and