Does anyone still make a Stock, or a Billet Crank still, for the Skidoo 277(72mm x 66mm) single cylinder engine? Has anyone ever Adapted a Skidoo 335/340 70mm Stroke Crank for a 277 Case? Does anyone have a CAD/PDF/Paper drawing of the Skidoo 277 Crank, Engine Case, etc? My 277 seems to be a...