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A sled to backfire my polaris is backfiring sometimes...also I went out to test it today it was running pretty good and then I came back and tried it again and the gas line on the carb came out so we fixed that and tried to start it again and it wouldnt start...I dunno, maybe I fouled a plug?
 

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Have you checked your plugs? It could also be the floats. If one gets stuck open that will cause it to backfire while idling, and run fine at higher speeds.
 
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