Mark you are correct about the made it Italy - Well at least for mine!
I picked up the o rings from the local Stihl shop today and they seem pretty close to spot on.
Bigted mine is mounted on what looks like a standard Victa base. I have only ever seen these engines on Masport bases before and the ones I find are so stuffed it just wasn�t worth my time even getting them for parts.
I have included a photo below to help others through the process of the carburettor dismantled. Once everything is re-assembled I�ll let you know how it goes!

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