Gasket reed valve Minarelli MA/MY - Yamaha OEM

Yamaha OEM No.: 4CU-E3621-00 Paper packs are sometimes said to fit a little poorly from different manufacturers. This is often because they dry out during storage. Moisten the gasket with water and put it in a plastic bag a few hours before assembly and it will fit better. Quoted from Teknos repair technique for motorcycles, 1955