Vespa V50 PK50-125 Prim ET3 Polini 2.56->2.46 Small Primary Gear - 28 Tooth Straight Cut Engine Components Necessary modifications to the engine:

Necessary modifications to the engine:

5 Sided cylinder head cooling jacket surface

The motor can then be reduced sufficiently long on the primary side

Wider choice of stroke and connecting rod combinations than before

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Vespa V50 PK50-125 Prim ET3 Polini 2.56->2.46 Small Primary Gear - 28 Tooth Straight Cut Engine Components Necessary modifications to the engine:Vespa V50 PK50 125 Prim ET3 Polini 2. 56 >2. 46 Small Primary Gear 28 Tooth Straight Cut For the following fitments: Vespa (Augsburg) Vespa 50 N (type 5N1, V5A1T), Vespa 50 S (type 5S1, V5SA1T) Vespa (Motovespa) PK 125 S (engine 56M), PK 125 S elestar (engine 66M), PK 125 XL (engine 97M), PK 125 XL E (engine 100M), PK 75 S (engine 57M), PK 75 S elestar (engine 67M), PK 75 S junior (engine 67M), PK 75 XL (engine 96M), PK 75 XL E (engine 104M) Vespa