Question about Polaris ATV

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Idles great but open the throttle it misses and backfires

When the neighbor brought over the 2001 Sportsman 500 told me the problem I had the same thing in Alaska and replaced the cam and it ran great. But when he brought it in it would idle and cut out when opened the throttle, so I replaced the cam and adjusted the valves and started it it still did the same but more noticeable with the backfiring and I am woundering if the timing is 180* off and I am stumped. Thanks Riley

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Sounds like you have an air leak on the intake somewhere

Posted on Jul 14, 2017

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Posted on Jan 02, 2017

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Anonymous

  • 1 Answer

SOURCE: backfires at half to full throttle, idle is ok, low rpm

hi how are you

Posted on May 24, 2009

SOURCE: i have a 2001 polaris

did you check the cdi box because it may be missfiring. thats what my dads did.

Posted on Nov 30, 2011

brandonli42040

brandon lilly

  • 18 Answers

SOURCE: How to turn up idle on 2013 polaris sportsman 500 ho

follow ur throttle cable down to cars there should be a plastic screw close to cable to adjust idea but with polaris that screw can be hard to find with all the plasticc they put in way but if u can see carbs easy enough u will see the idle screw

Posted on Feb 11, 2014

Testimonial: "Thx"

David

  • 49 Answers

SOURCE: engine won't idle /sometimes backfires

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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sounds like an air leak, prob between the carb and air filter. when you open it up the carb loses vacuum and cant draw fuel.

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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

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follow ur throttle cable down to cars there should be a plastic screw close to cable to adjust idea but with polaris that screw can be hard to find with all the plasticc they put in way but if u can see carbs easy enough u will see the idle screw

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Did you replace the air filter? Do that.
This sounds a little deep for "good advice" on here.. three dealers couldn't fix it...??? I have fixed bikes that other dealers couldn't in the past... this sounds like an issue that will be fixed by someone that has had this same experience...(that's how I did it!)
Good Luck!!!!

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