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60mm crank and original px200 cylinder
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Johan
UTC
Member
Vespa Sprint 1966 Polini 221
Joined: UTC
Posts: 15
Location: Sweden
 
Johan
Member
Vespa Sprint 1966 Polini 221
Joined: UTC
Posts: 15
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 avatar
Steely Dan
UTC
Hooked
Lambretta GPs Lambretta S1s, Vespa Gl, Vespa P200, Serveta 150
Joined: UTC
Posts: 102
Location: United States
 
Steely Dan
Hooked
@steely_dan avatar
Lambretta GPs Lambretta S1s, Vespa Gl, Vespa P200, Serveta 150
Joined: UTC
Posts: 102
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.
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