for Vespa 50-125/PV/ET3/PK50-125/S/XL/XL2 clutch shaft/primary shaft for MINARELLI with polyamide cage ball: 4,762mm This product fits on almost all products Product description Regrettably, the quality of the crankshaft bearings is often underestimated when it comes to motor tuning projects. This is in spite of the fact that the crankshaft that they support is one of the hardest working components of the two-stroke motor! To help remedy this MALOSSI have, in collaboration with the engineers at SKF, developed a range of high-performance ball-bearings . To easily satisfy the highest standards they are constructed using needle-bearing grade stainless steel. The main differences to other bearings produced by SKF for scooter motors are the larger diameter bearing rollers and the partially carbon-nitrated inner ring. These features lead to a smoother running motor, especially noticeable at high revs. High revving motors can fail prematurely due to excessive heat expansi