Cylinder -POLINI cast iron Ø58mm, 135 ccm Evolution- Vespa PV125, ET3 125, PK125

Polini Evolution 135 cc - Cast iron cylinder with Ø58 mm for Vespa 125

The 135cc Evolution cylinder from Polini Motori is based on the well-known high-performance EVO aluminum cylinder with Nikasil coating. However, the new 135cc cylinder made from gray cast iron now has a 58 mm bore with a 51 mm stroke. This results in a slightly larger displacement of 135 cc. The rest of the layout has been retained, the control angles are 124° transfer port to 179° exhaust. The layout is determined by six transfer ports.

• Displacement: 135cc

• Bore: Ø58mm

• Stroke: 51 mm

• Cylinder material: gray cast iron

The exhaust is 38 mm wide. The stud bolt spacing (M8) is 56 mm and there is enough meat for further tuning. The piston comes with two 1.5 mm thin piston rings. The head is made of cast aluminum with a high silicon content. It also has additional cooling fins on the underside. This significantly improves heat dissipation, both from the cylinder itself and from the head. The compression has also been slightly adjusted and the head is sealed with a copper gasket.