CYLINDERKIT POLINI EVOLUTION REED VALVE 152cc VESPA 125 PRIMAVERA ET3 D.60 STROKE 54mm

Description

Polini Motori has produced a new Evolution kit with a reed valve induction in the cylinder for the 125 Vespa Primavera ET3.

Thanks to its 152cc displacement it features high level of power in in every kind of driving and for any type of race.

The kit with Evolution reed valve induction in the cylinder is supplied with: cylinder, piston, head, reed valve, intake manifold and gaskets set.

The cylinder is cast in aluminium with bore d. 60x54mm.

The liner with Nickel-Siliceous coating improves the piston sliding, its resistance to wear and abrasion. The transfer ports are designed for racing. It has 6 transfers. The transfer has a central bridge for a better exhaust gas scavenging.

The head is cast forma block and some fins have been made under the head surface in order to improve the heat dissipation. The compression ratio has been designed to achieve the best performance.

The piston is cast in aluminium and it has two S10 chromed cast iron ring. After being worked the piston has been covered with special molybdenum-bisulphide coating that improves the piston sliding during the running in period.

The reed valve has 6 carbon flaps of 0,4 mm thickness and the geometry of the flow guide allows it to improve of the air-petrol mixtures incoming speed.

The intake manifold has been developed to be housed in its original space without any modification and to be matched with the d.34 Dell’orto VHSB Carburetor.