The Pinasco "EVOTEN BIG BORE QUADRO" Ø 46mmx46mm cylinder kit is a new product dedicated to the world of Piaggio mopeds with 46mm stroke crankshaft and is the specific cylinder kit for the Pinasco 46x46 Master and Slave crankcases. The displacement approaches 80cc, is equipped with a single-ring piston and mounts the 22, 25 and 28mm flanged exhaust manifolds. The Pinasco "EVOTEN BIG BORE QUADRO" thermal unit is supplied with the new central unified spark plug head with 5 studs fixed to the recess and complete with decompression valve which definitively eliminates the problem of the combustion chamber vents and the consequent loss of performance; the compression ratio is 13.5: 1.