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Quick help please!

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I've got a very rich running yz 85(black or fouled plugs every ride.)I've tried many different ratios of premix-all with the same result.Currently I have the clip in the top groove of the needle and the fuel screw 1 1/2 turns out which seems better.The main jet is a 138 which seems a little small to me. Should I go bigger or smaller to lean it out?I'm a lttle worried the clip is in the top groove. My son rides pretty hard so I know its not that. Please help.:confused:

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I set up a yz 85 here in Utah. We had to drop down to a 128, 130 and a 132 depending on conditions to get it to run decently.

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