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Once you get those plugs out, either put new ones back in or fill the hole with thick grease. Those plugs prevented the screws from oxidizing, and becoming useless as they become fused with oxidation into the carb body threads, never to be able to be adjusted again. Just a heads up on once beautiful GPZ. That bike is a collector quality machine. :)
I was faced with this problem and printed two versions of plugs. One with a spring-loaded tapered shank and the other with an O-ring seal. You can download either design here:

21 - 25 of 25 Posts