Modern Vespa

hi all

i want to upgrade my gs160 with this cylinder: http://www.scooter-center.com/en/product/3330150/Cylinder+SALE+Big+Bore+192+ccm+Vespa+SS180+GS160+638mm

My questions is what size Grand Sport piston for this cylinder?

http://www.scooter-center.com/en/product/7675739/6350mm

And what Grand Sport cylinder stud to use:

this http://www.scooter-center.com/en/product/7672701/Exhaust+manifold+VESPA+Vespa+GS160+GS4+VSB1T+SS180+VSC1T+Rally180+VSD1T

or this http://www.scooter-center.com/en/product/7673526/Exhaust+manifold+VESPA+Vespa+GS160+GS4+VSB1T+SS180+VSC1T+Rally180+VSD1T+for+200+cc+exhaust

Last question is, can I use my stock gs160 cylinderhead with this big bore cylinder or what head should i use?

Hope you can help me

cheers
Kasper

Hi Kasper, long time no hear!

It means a fair bit of case work and welding, but you could fit one of these -

https://www.facebook.com/notes/pinasco-official-page/gruppo-termico-pinasco-215-225-235-doppio-carburatore/10153166684108062

There's some interesting info here -
http://www.vespaio.net/Vespa180SS%20-%20VSC1T.htm

I wonder how far you can bore that cylinder? Here is a larger piston -

https://www.facebook.com/mbscootersltd/photos/?tab=album&album_id=715279548537857