Primary transmission Z 18/67 (helical teeth) - Vespa PK 50 AIR 2T ('83-'89 / version 50->75cc) - Polini

Primary transmission Z 18/67 Polini for the following applications: Vespa PK 50 AIR 2T (1983-1989 / version 50->75cc) / PK 50 FL AIR 2T (1990-1996 / version 50->75cc) / PK 50 XL AIR 2T (1986-1989 / version 50->75cc) / Special 50 AIR 2T (1974-1979 / version 50->75cc) / SS 50 AIR 2T (1965-1971 / version 50->75cc) / V 50 AIR 2T (1965-1979 / version 50->75cc).

- Helical gear primary transmission;
- Number of teeth: 18/67.