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There is a copper coler screw on the back side of the carb that you can turn with your fingers or a short strait blade screwdriver i t is tucked back there good but if you look from the oposite side you can see it start the bike and if it was like mine its prolly idling high so turn it counterclockwise.

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Q: How do you adjust idle on 2003 TTR 90 Dirt bike?
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