The first series of 50cc Piaggio 4-stroke engines came with a crankshaft that used the side of the belt with a 25x56x12mm crankshaft bearing. It was then changed to the internal diameter of 20mm, now common on 50 Piaggio engines. For this crankshaft there is a crankshaft bearing set complete with the two necessary bearings and shaft seals. It used Japanese NTN bearings and oil seals in top quality. Matching crankshaft: 17049
OEM numbers for purpose of comparison: 969381, 96925R, 969028, 2879633
