Cylinder Polini 177 cc aluminum race 57 for Vespa PX 125/150 all - Sprint Veloce - TS - LML Star Deluxe 125/150 / what

Polini 177cc aluminium cylinder for Vespa PX 125/150 all - Sprint Veloce - TS - LML Star Deluxe 125/150. Attention : In case of electric starter it is necessary to slightly file the cylinder on the external part near the flywheel, because the starter crown mounted on the flywheel interferes with the cylinder. THESE COMPONENTS ARE INTENDED FOR RACING-SPORT USE ONLY What a punch your Vespa PX 125/150 will have with the Polini aluminium kit available in two displacements, with double spark plug head and 8 fixing points! Many are the strong points of this new Polini kit: - 63mm diameter cylinder. redesigned in the transfer case to improve gas flow. Available with a standard 57 mm stroke that develops a displacement of 178 cc. or decidedly more racing with stroke increased to 60 mm to obtain a displacement of 187 cc. An early crankshaft is available for the 60 stroke kit. The cylinder is air-cooled, but thanks to the aluminium and the special design of the fins the engine temperature remains lower. - New head cast in shell and arranged to have two spark plug holes. The classic spark plug hole on the side like the original is the easiest to fit, or the 'Racing' version with a central hole requires a small modification to the plastic of the cowl. Another important feature concerns the fastening points: in addition to the 4 standard fastening points, the Polini head has another 4 that guarantee a greater compression hold. The finning is enlarged to have the best heat dispersion and the head gasket is made of siliconised steel (not present on the original Vespa) to guarantee maximum tightness during compression between head and cylinder. The kit allows you to increase power and improve performance while keeping it constant over time. Code 140.0081 57 mm stroke. Code 140.0088 60 mm stroke. Code 210.0044 60 mm stroke crankshaft. 100% Made in Italy