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There are two possible things that it could be... it is more than likely your gas... if it has set up for any length of time, it is possible that you have bad gas... just drain your tank and put fresh gas in there.. the other is your spark plugs.. you should just go ahead and take them out and clean them really good, with a little bit of sand paper and put them back in and it should be running like new after that... be sure to drain your carb before you put the good gas in your atv.. good luck

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Q: What should you check first if an ATV backfires and will not start?
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