Very good quality replacement crankshaft for 50cc Piaggio scooters with 4-stroke engines. The crankshaft design matches the original 100%, and is perfect as a low-cost replacement part. Also a good choice for mildly tuned engines upto 70cc sport cylinders for everyday use. We definitely recommend the installation to use a new set of crankshaft bearings and shaft seals. These can be ordered at the same time. Seat for crankshaft 20mm.