Need info on the 126BIS

[124cso]

I'm looking for pistons for my 650 air cooled 126 and come across a foreign site listing some. However in their listing they say for a 650cc , then "engine type benzina 0.7".
As the BIS and later Cinchento never came to this part of the world, I have no knowledge of them.

Is the water cooled (BIS) a 650 or 700cc ? I.E. are the bores the same diameter  @ 77mm ?

i believe the water cooled Cinchento  is a 700cc and 80mm bore ? And I know my spelling of cinchento is probably way wrong.

[dombooth]

The water cooled is a BIS 700cc, not sure on the piston size though

[Da Londo]

The BIS has 80mm bore cylinders.