Small primary gear -BGM PRO 2.56->2.65- Vespa V50, PV125, ET3, PK50, PK80, PK125 - 26 tooth 51568

This allows you to shorten your complete transmission ratio without having to open the complete engine. The fast way to get a fourth gear that is too long and causes gear connection problems.
Hardened are the bgm gears with 58 HRC and therefore correspond to the Piaggio original equipment quality.
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