Vespa V90 Prim, PK Kit Polini 135cc Race Cylinder Kit
Product Code: BD06371
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Vespa - Cylinder Kit - Polini - 135cc Race
Cast Iron with new design Cylinder Head for improved cooling.
57mm Bore with 6 transfers
M8 Exhaust Studs with Primavera 50mm Exhaust Stud Spacing.
The cylinder is made of lamellar graphitic cast iron lubricated and wear resistant. It assures better mechanical resistance. It reduces the engine working temperature and avoids possible low of power.
Piston is gravity cast in light alloy with silicon content and two cast iron "S10" chromed piston rings.
Aluminum cast head with two fins that better dissipates the heat both in the top and bottom. It improves the cooling and compression ratio.
It has a new copper gasket that eliminates the gasses escaping between the head and cylinder but still allows the heat to transfer easier.
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VESPA 50 with Primavera crankshaft fitted.