Primary transmission Z 25 (straight teeth) - Vespa PK 50 AIR 2T ('83-'89 / version 75->90cc) - Polini

Primary transmission Z 25 Polini for the following applications: Vespa PK 50 AIR 2T (1983-1989 / version 75->90cc) / PK 50 FL AIR 2T (1990-1996 / version 75->90cc) / PK 50 XL AIR 2T (1986-1989 / version 75->90cc) / Special 50 AIR 2T (1974-1979 / version 75->90cc) / SS 50 AIR 2T (1965-1971 / version 75->90cc) / V 50 AIR 2T (1965-1979 / version 75->90cc).

- Straight cut primary transmission with flexible coupling system and reinforced clutch basket;
- The clutch basket is machined from a solid block and undergoes a carburizing heat treatment;
- The steel coupling system flanges ensure maximum strength;
- High-strength steel springs are calibrated to prevent breakage of the gear itself;
- 100% made in Italy;
- Number of teeth on the pinion: 25.