von der racinglambrettas Seite: Upon advice from the man in the engineering shop, highly appreciated as scooterist himself in the past and already builder of tuned Lambrettas, once rebored the barrel to 70 mm. as the piston and enlarged and polished transfers and ports, I let him make two extra finger ports one of which designes an "S" while the other is straight, matching with two holes on the piston. On it also to avoid as much as possible seizing problems, he made some small cuts on the surface and all angles have been rounded.