I think I have some OKO jets from a Lambretta I built a few years back. I believe they are the same. I've no idea on sizes, but I bought a range of them at the time to tune my jetting. I might be wide of the mark and they may not be the sizes you need, but I'll have a look and see what I have.
Hi Ian, Sorry, I've had a look through my box of Lambretta parts and have no jets. I must have given them to the guy I sold the bike to at the time. Apologies. I used to buy these through ScootsRS. They are in Vietnam, but are cheap enough and ship quickly. Scooter Carburetors - Jets - Needles - Etc. parts
Allens are the people, I've been there a few times times (they're not far from me) and they've always had what I wanted in stock. Very knowledgeable too.
Keep us posted on progress - the standard set up for our bikes is pretty well known, but it would be interested to know how far from this (if at all!) you end up. Sent from my P01M using Tapatalk