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Discussion Starter · #1 ·
i have a 08 yfz 450 with a fmf slip on and air ox cover removed just cleaned carb and it’s still not running right i ajust the black screw and the pipe either gets red hot fast and backfires or doesn’t have power and wines out always seems to run different
 

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The red pipe means that its running lean and are you talking about the black knob on the side of the carb? Because the black knob just plays with idle and not the jetting.
 
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