Question about Polaris 2006 Sportsman 450

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Engine won't idle /sometimes backfires

I have to use throttle to keep it running @low RPM.

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  • 49 Answers

Check the MAF-MAP SENCER or it's a throttle position sencer is bad check both by replacing them and see if it works or the last result is idle control valve

Posted on Mar 24, 2014

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Why does my ATV bog down and die when I keep the throttle wide open?


If you are lucky, you might just need new fuel filter and the fuel bowl cleaned out, and maybe new air filter. If not so lucky you need carburetor rebuilt. Backfire is usaully caused by engine running too lean ( too much air for the amount of fuel present). Fuel bowls get gunk in them and the fuel needles and fuel jets get varnished up. The accelerator pump gets worn out gaskets and/or bellows and doesn't give the right amount of fuel mist when you accelerate.

Full Choke is indicative of a motor starved for fuel

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sounds like the carburetor needs cleaned and or rebuilt. or you could have a vacuum leak..

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The adjustment for the idle would be on the side of the carb. sometimes just as a phillips screw and sometimes as a knob that is on a cable type settup.

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clean the carb. look for air leaks.

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