Zylinderkopf 210ccm "Polini" 207ccm ,210ccm & 221ccm Vespa PX
The second important feature is the new head casts in shell. It has a modern design of the dome that makes it stronger so you have a perfect squish and the possibility to place the spark plug with long thread in centrally to the combustion chamber. The air-cooling finns have been improved to have the best heat dissipation and the head gasket made of steel with silicon content (not available on the original Vespa)that assures a perfect seal between head and cylinder. The kit thus renewed permits to increase the power and to reach the best performance keeping them constant over time. The head will be sold individually with the gasket too because it will be adaptable to fit the older kit without head, both in aluminum and cast iron.