Primary transmission Evolution Z 24/72 (straight teeth) - Vespa PK 50 AIR 2T '83-'89 / version 75->90cc) - Polini

Primary transmission Evolution Z 24/72 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 tooth primary transmission with flexible coupling system and reinforced clutch basket;
- The clutch basket is machined from a solid block and undergoes a hardening 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 gears: 24/72.