Modern Vespa : 60mm crank and original px200 cylinder

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OP Johan UTC details Enthusiast Vespa Sprint 1966 PX200 Joined: UTC Posts: 51 Location: Sweden
OP Johan Enthusiast Vespa Sprint 1966 PX200 Joined: UTC Posts: 51 Location: Sweden	UTC quote I will use my 60mm Bgm crank with a original px200 cylinder and a gs piston. Is it a 1,5 cylinder base gasket and no head gasket that is needed? And another question, can a Polini 221 kit cylinder be used with a 57mm crank or does it have to be milled down?

Steely Dan UTC details Hooked Too much stuff Joined: UTC Posts: 179 Location: United States
Steely Dan Hooked Too much stuff Joined: UTC Posts: 179 Location: United States	UTC quote As far as the 60mm crank is concerned, you can run this crank with zero base gaskets and usually no head gasket. you just have to check for squish. This was a common modification back in the day. i suggest keeping your port timings low and IF you need a larger squish run a head gasket. You can live inside the factory squish of these bikes from the factory.