for MINARELLI vertical 50ccm 2T AC stroke 39.2mm conrod 80.0mm pin 10mm TUNING SPORT – high-performance Product description Want more power We’ve got just the right one for you withPOLINI HPC racing crankshaft . Higher pre-compression guarantees better performance, higher rpm’s, higher top speeds. High compression full circle crankshaft, high quality silver bearing (heat dissipation!); operational area up to 15,000 rpm’s. Good durability, suitable for 50ccm and 70ccm tuning motors. Reduced weight due to high tec synthetic material. Available for 10 and 12mm piston bolts TIP! Don’t forget new bearings, gaskets and oil seal rings OEM numbers (for comparisons): 210.0049 (POLINI)