How experenced are you with two strokes? I know just a few months ago I started driving two strokes, and man I was frustrated. But after a while I learned you have to gun it quite alot more so that you dont dog it down.
But if you know all that good stuff, it could possibly be one of your jets, mainly the one that affects 1/4 to half. Which I think is the idle jet. But like you say it idles fine so I am not sure what you can do to help, unless what I said first works.
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