Polini Motori Ø59 aluminium cylinder kit has been designed with specific characteristics for Yamaha BW’s, Zuma and Cygnus 4 stroke scooters.
- The power increase deeply improves the performance features
- The displacement has been increased to 158,3cc
- Compression ratio is 11,1:1
- Made of die-casting aluminium with cast iron liner.
Two are the models available:
- One for Yamaha injection engine, which include the ECU and its wiring.
- One is for the Yamaha carburetor engines without ECU