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I would get them off and give everything a large dose of plusgas particularly the slow running jets located (maybe ) under some rubber bungs (bungs usually go AWOL) just in front of the float drain plugs.
The cross head screws on the carburettors are soft and Japanese standard cross head (forget the correct reference letters - JP1?) whatever a PZ1 or PZ2 or a Phillips cross head will almost certainly chew it up before it undoes and then you have a problem.
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