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A long production run...some of these 250's are certainly ageing. As you've noticed orings approaching the end of their useful service life. As such, in particular the carb fuel rail orings become imperative to replace, though requiring a "split".
I see many hardened, near crystallized, flattened, corroded carb orings. Some rail orings right on the verge of becoming intense leakers. Mikuni (used on early 2V Ducati) not immune either.
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