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A lean condition can cause your ATV to run hot and idle high. Start with the easy stuff first.... Check for vacuum leaks at the carb, and the tube connecting the carb to the head. An easy way is to start the ATV, and spray starting fluid around the carb and intake, if it revs or changes idle speed, you have a leak. (be careful, this can ignite too) If this is ok, check your air filter. Make sure you have one, and that it is not clogged. No filter is bad. If all is well there, pull the float bowl and pull the main jet out (unscrews). Make sure it is not clogged, clean it and then clean the needle seat which is straight up past the jet. Clean the idle jet and passages, then check your needle and slide inside (the part that moves up when you give it throttle). There should be very little play if any in the slide from side to side. Also check the needle for wear, and it should not move up and down in the slide.

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Q: What would make your prairie 300 4x4 over heat real fast and engine start to rev real high?
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