This came up a while ago, its not just junior but Rotax across the board. The carbs come set at 3mm from JAG, but you can alter the characteristics of the carb by altering the height of the floats.
Some people say 6 and others say 3 but the thing to do is try them and see what works best for you. The thing is as you change the float height you will need to alter the jetting accordingly.
My understanding is that the bigger the height of the floats the leaner the mixture is across the board.
John is the best one to advise, but again search back through the previous posts and test to you find an answer that works for you.
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