For Vespa GTS/​GTS Super/​GTS Super Sport/​GTV 300 ccm 4T LC

also suitable for Quasar 300cc 4T LC i.e.

Aluminium Ø 77mm stroke 63mm piston bolt Ø 16mm without cylinder head without ECU - Electronic Control Unit TUNING SPORT - powerful For racing purposes only. Not permitted under the German StVZO!     POLINI gives the Vespa GTS 300 engine a real 293 cc and offers pure power.   The POLINI EXPLOSION racing cylinder for the Vespa GTS 300 models reaches a displacement of real 293 cc thanks to its 77 mm bore compared to the standard cylinder with 278 cc displacement. This means a significant increase in displacement. 293cc Ø77mm bore 63mm stroke The cylinder is made of high-quality aluminum and has a steel liner with Nikasil coating. This design is based on modern racing engines and ensures high strength and durability. An exclusive feature in the scooter market is the HTR ring (High Turbulence Ring). This ring not only improves the squish effect, which describes the acceleration of the gasoline-air mixture in the combustion chamber, but also allows a larger contact surface for the cylinder head gasket. This ensures much higher reliability of this important component. The specially designed piston of the racing cylinder is designed to achieve the best compression ratio. It has wide squish surfaces to match the original headstock. This optimizes engine performance and efficiency. Significant power increases can be achieved by installing the POLINI racing cylinder, which is especially important for sporting applications or tuning projects. However, it is important to note that the installation of a racing cylinder requires additional adjustments to other engine components and appropriate tuning to utilize the engine's full potential and ensure engine reliability.  

Installation note:  It is necessary to install the matching CDI for Euro 3-4 and Euro 5 models from POLINI or the Stage 2 / Stage 3 Ecu Performance Upgrade