As said that mixture screw is maybe equal to 1/2 jet size , you need a bigger pilot jet . The 48 should be fine , I can't remember what I have in all of mine but I know none are bigger than a 48 , more like 45 . You could have an airleak somewhere which is requiring a bit more fuel to make up for it . otherwise your fuel can just be that way and require a richer mixture. If you have a set of jet drills you can drill out the 48 about .001" and then file a slash across the number to remind you it has been drilled , I've done that a few times if it saves a bunch of messing around.
I generally have my idle set up around 1700-1800 , too low and these big singles get hard to keep running .
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'86 XT600/3TB motor,,, '88 XT600, ,,'92 XT600e,,, '08 Husky TE510,,, '05 DRZ463,,, '95 KLX650 ,,,'96 KLX650
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