Big bore kit Polini 85cc smallframe Vespa

This high performance 85cc sports/racing kit by the legendary Polini (Italy) offers the following features: Alloy head with computer designed squish band Wide exhaust port for maximum port-time area Cast iron cylinder for high temperature shape stability and long life Also includes new exhaust studs and gasket set Powerful and durable, the Polini sports 6 transfer ports and advanced port mapping especially on the exhaust. To suit practically all 2 stroke 50cc engines on smallframe Vespa: 50 S 50SS / Supersprint 50 PK50 / XL / XL2 (not auto PK50 though) This kit must be fitted and the carb tuned by a technician or skilled person. Piston seizure is a symptom of poor carb tuning and claims regarding these kinds of problems will not be accepted. This kit increases engine size to 85cc so your bike may not be legally registered as a moped.