Polini Big Evolution Racing crankshaft for the 94 Big Evolution cylinder kit with 13mm gudgeon pin for scooters with water-cooled Minarelli horizontal engines. The crankshaft has a 16mm thick tail shaft, meaning a larger vario sleeve/bushing must be used - or even a corresponding racing variator. Note: the crankshaft can be installed only in conjunction with the Big Evolution cylinder kit 166.0111. Technical data: Connecting rod: 85mm Stroke: 44.3mm tail shaft: 16mm gudgeon pin: 13mm