Yamaha X-Max 125 06-20 variator half-pulley Malossi

This is the fixed half-pulley that goes on the end of the crankshaft.
Its larger blades significantly improve cooling inside the crankcase.
The inclination of the pulley has been specially designed to optimise the performance of Polini and Malossi variators, although it can also be installed together with the original variator.