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On the PE28FL the mixture screw is an idle fuel mixture counterclockwise is richer, clockwise,leaner. I know you're at higher elevation than most of us. I can't remember if your exhaust, and breather us stock, but the 38 pilot would be plenty if you are still running it pretty much stock. I would say about a 110 main,or 105, but I think my Nibbi came with a couple of less common sizes, like a 112.5, or a 108. If you have a 108 it should be pretty good, as well. I get confused when people take about the needle clip position using numbers, but if it doesn't do well with the clip in the middle try moving the clip up towards the blunt end one position. If the bike was doing well with your other carb, then the main jet in it may be the size you need now
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