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Any thing above 8,000 rpm is only affected by the main jet. Between 4,000 and 8,000 it is the needles. Below 4,000 it is the float setting and the fuel screw. If you have a problem above 8,000 you need to fix that first because the main jet selection will affect everything else. To shim the needles you need a #4 washer. This is the washer that fits a #4 screw. Most hardware stores will carry them. I like to use the brass ones because they seem to be more uniform. I would start with a couple. The fuel screws usually work best somewhere close to stock which is 2 turns out. I wouldn't go more than 3 1/2 out.

I would guess that the only problem the shims will cure is the 5,000 rpm one. Are you sure you are lean at high rpm and not rich?
 
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