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Paolo - as Bigsud says, check for blocked jets on the No 1 cyl's carb throat. If you've got good spark then it's most likely fuelling. If a jet is badly blocked, fuel may be sort of dribbling through and not atomising properly, causing the plug to foul quickly.
You can fit the Bosch ign system from twin carb engine - this will be at least correct in terms of advance curve etc if indeed there is a difference from single to twin carb in that regard. Don't think it'll solve your current issue though.
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