Malossi special racing crank for 47.6mm 70cc MHR Team II cylinder kit and the 77cc Big Bore MHR Team with 50mm bore. Standard stroke crank: 39.2mm with 80mm rod, but can be used on other racing cylinders with 12mm gudgeon pins. High end product. Reinforced design meant changing the crank stump size. All mounting parts supplied (variator back plate / variator bush etc.) Can be used with most Malossi Overrange variators. Other varios must be lightly modified to run this crank.