To answer your question:
Contact Bill Bune. I think he's in Anoka. He's in the book. He did a fine job with a PX 150 bore. It's always best to provide the new piston so that the shop can match it precisely.
I would guess those are Indian "restos". Those Lambrettas look like API's.
I could be wrong but I doubt those are "restored" in the U.S. I bet he imports lots of parts from Indian and had a line on scooters.
There are many things that make a vintage scooter work right or wrong.
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