Cylinder Polini Evolution w/ reed valve 152cc, Vespa 50 Special / Primavera 125cc ET3, d=60mm, 54mm stroke

Cylinder Kit Polini Evolution w/ reed valve 152cc, Vespa 50 Special / Primavera 125cc ET3, d=60mm, 54mm stroke.

Polini is one of the big names in 50cc scooter tuning, and is also one of the leading manufacturers of tuning parts for Vespa, modern and vintage. Cylinders, intake manifolds, exhausts, air filters, carburetors, crankshafts and more – everything you need to boost the performance of your Vespa.

This is the Polini Evolution cylinder with reed valve supported intake. The large reed valve with 0.4mm petals and the intake manifold are designed for use with 34mm carburetors and ensure that cylinder filling is optimal at all times. The cylinder with divided exhaust port is an enhanced development of the Evolution 133, with a 60mm bore and a displacement of 152cc. This means that you can reach 30 hp on the condition you add the right components. The cylinder sets new standards for road or race track.

• Displacement: 152cc
• Bore: 60mm
• Stroke: 54mm
• Compression: 14.2:1
• Exhaust port timing: 194°
• Milling on crankcase left side: 89.5 x 22.4mm
• Milling on crankcase right side: 89.5 x 15.8mm

For Vespa 50 Special / PK / Primavera 125cc ET3

Note: The crankcase must be milled open to fit the cylinder, and you’ll have to use a crankshaft with 54mm stroke / 105mm connecting rod.