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Guys this 1991 exciter ex 570 I’m having a top end issue it has all the low end torque but just won’t open up in the high end. I have the needle position on #3 like the book suggest. 5/8 turns out on air idle screw like book suggests. I dropped the needle all the way down and bam it was all there but I pulled my plugs and one side was running very lean so how do I fine tune it. Jetting is also stock 310 mains
 
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