Cylinder and control unit kit Polini 158cc Yamaha BW'S 125 4-Stroke

The Polini Motori aluminium Ø 59 thermal group kit has been designed with specific features for Yamaha BW’s, Zuma, Cygnus 125 4T scooters.

The increase in displacement noticeably improves various performances: recovery, acceleration and power at low and medium revs. The displacement increases up to 158.3cc., the compression ratio is 11.1:1, the casting is aluminium with a cast iron cylinder. Two different models are available:

- one for Yamaha injection engine, including ECU control unit and the corresponding wiring. The Polini ECU controls the amount of fuel entering the cylinder by modifying the injection timing and allowing constant carburation tuning.