POLINI 140.0234 58 mm thermal group kit for VESPA 125 PRIMAVERA ET3 PK model EVOLUTION 3 with rotary valve

POLINI 58 EVOLUTION 3 KIT FOR VESPA 125 PRIMAVERA ET3 The Polini Evolution 3 kit for Vespa was created for track competitions in the Vespa Classic 135cc category. The strong point of the new kit is the possibility of fitting it on original Vespa crankcases, avoiding boring the crankcases. A particular feature of this cylinder is the assembly designed to work both in the original position and in the classic turned version often used in track races. This position facilitates the development and assembly of the muffler. The engine gains more power at every rpm. The Polini Evolution 3 kit for Vespa with rotary valve intake can be fitted on all types of Vespa 125 with a crankshaft of the same size as the original. Furthermore, a Polini crankshaft code 210.0033 is also available with connecting rod machined from solid, advanced and balanced to be fitted maintaining the original 51mm stroke. TECHNICAL FEATURES of the Polini Evolution 3 kit for Vespa The cylinder is cast in aluminum, with a bore of 58mm. for a displacement of 135cc. The barrel with a Nickel-Silicon coating improves piston sliding, wear and abrasion resistance. Very "racing" distribution diagram. Six transfer ports. The forged piston is equipped with two chromed S10 cast iron segments. The head is cast in a single piece and to increase heat dissipation additional fins have been created even under the head plane. The compression ratio has been designed to obtain maximum performance.