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Just had a thought whilst looking at this. When I had my carbs off it became apparent that the head intakes at 32mm bore, the carb isolator is 30mm bore to match the newer 30mm carbs as fitted since 1989.
So in your experiment, did you use 32mm carb isolators ? If not then the bike was still running with a 30mm intake restriction, regardless of carb size !
Just a thought.
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