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TTR 90 wont idle

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I have an 02 ttr90. It starts great but wont idle. If i tighten the idle screw it will idle but then it is very slow to rev-DOWN when throtle is released - very dangerous in the hands of my son. If if loosen the idle screw it seems to rev up and down quickly but will not idle. Any suggestions?

Also, not sure if this is a factor: I cleaned out carb througoghly. I made the mistake of not noting the position of the air mix screw. Dont really know how to make sure i have the right adjustment on this so any suggestions here would also be appreciated.

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Make sure your pilot jet isn't clogged, check the float level. If both of these are good, tighten your air screw so its lightly seated all the way in, then back it out 1 3/4 turns out.

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