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i have a 2006 polaris sportsman 500 ho. i cleaned the carb out and now it will start buy i have to give it gas and keep giveing it gas. it doesnt sound like it did befor i cleaned the carb. whenever i let go of the gas it dies and right before it dies it backfires. any ideas what i need to do to get my baby back up and running. thanks
 

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A black plug would probably mean a rich burn. it sounds like you could have the float in the carberator set too high. This would cause an over fuel for the engine. You need to keep the throttle opened up to allow for more air in the fuel mix. thus this is why it will only run off of idle. Re check you carberator setting have a good look at the needle and seat.

Your float hight should be 13 to 14 mm from the carberator base mating surface to the top of the step on the float. sit the carberator on a workbench on the venturi end of the carberator this is where the air enters the carberator (hooks to the air filter).
 
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