Vespa V90 Prim 125 ET3 PK125 POLINI EVOLUTION 133cc 135cc Cylinder Kit

Vespa V90 Prim 125 ET3 PK125 POLINI EVOLUTION 133cc 135cc Cylinder Kit

With the 133 Evolution Polini Motori presents a completely new development. The cylinder is made of aluminium with Nikasil coating.
With 57 mm bore and 51 mm stroke, 133 cc displacement is available. The timing is 124° overflow to 179° exhaust. The layout is determined by six overflows. This is a completely new design with fat volume.
The exhaust shape is also new. The exhaust is 38mm wide, which is 68% chord measurement. The stud spacing (M8) is 56 mm and there is plenty of meat for further tuning.
The piston comes with two 1.5mm thin piston rings. It is coated to ease the break-in period. The head is made of cast aluminum with a high silicon content. In addition, it has additional cooling fins on the underside. This allows the heat to be dissipated much better, both from the cylinder itself and from the head. The compression was also slightly adjusted and the head is sealed with a copper gasket.

Alloy with new design Cylinder Head
Includes gaskets (Not shown)
Standard Rotory Valve Induction
M8 Exhaust Studs with PK125 55mm Spacing
57mm Bore

Fitment:

VESPA 100
VESPA 100 SPORT
VESPA 90
VESPA 90 RACER
VESPA 90 SS
VESPA ET3
VESPA PK 100 S
VESPA PK 100 XL
VESPA PK 125 ETS
VESPA PK 125 S
VESPA PRIMAVERA
VESPA 50 with Primavera crankshaft fitted.