Products reserved exclusively for competitions in designated areas, in accordance with the provisions of the competent sports authorities. We assume no responsibility for improper use.

New Polini cylinder kits for Yamaha Minarelli engines
Polini Motori presents the new range of kits for Minarelli engines mod. CY, MY, CW with Ø 12mm piston pin.
This feature lets an increase in terms of liability of a parts that its under long stress.
The cast iron cylinder with 6 transfers is machined with tools that grant high quality products, with sliding walls with controlled roughness for a better cylinder-piston sliding. The exhaust diagrams and the transfers have been designed to work in line both with the Polini Original and Scooter Team mufflers.
The piston is mad of special alloy with high siliceous percentage with the aim to grant the maximum resistance to high temperatures.
The piston rings made of spheroidal cast iron, highly resistant to wear, rebored and lapped.
The head is made of special aluminum light alloy with high coefficient of heat exchange. The combustion chamber has been completely redesigned for a high compression ratios with high turbulence.
Polini cylinders kits for Yamaha Minarelli engines must be installed together with the crankshafts with connecting rods for Ø 12 piston pins.
Polini cylinder kits for Yamaha Minarelli engines Ø 12:
166.0074/12
166.0076/12
166.0083/12
Crankshaft :
Item 210.0048/12 Yamaha Horizontal
Item 210.0049/10 Yamaha Vertical
100% Made in Italy