Pinasco brand cylinder kit to raise your Vespa 50 to 100cc! We recommend careful tuning and Vespa 90 ry gears with the installation of this kit. Replacement rings can be found here . Replacement pistons can be found here . ***PLEASE NOTE*** Performance upgrades are considered racing parts and are not covered by warranty. There are too many variables involved with user-installed parts, and pushing the limits of your engine tends to wear parts faster. Use at your own risk!