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Old 12-29-2010, 04:56 AM
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850 xp backfire

i have about 80 miles on my 2010 xp 850 and several times while riding it has backfired. it usually happens when going down hill or after i let out of the throttle from doing about 30-40mph. i have not had it over 50mph yet and have been really taking it easy on it so as to properly break it in. any ideas on why it backfires
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Old 12-29-2010, 05:07 AM
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I have the same machine and it did it a few times during break in and disappeared after that.
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Old 12-29-2010, 05:32 AM
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how many miles did you put on it for break in? i was told to run 2 tanks of fuel through it and i have ran about 1 1/4 tanks in it and have 80 miles and it still backfires
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2010 Polaris XP 850 Wes rear box with seat, GURU Cobra front and rear Bumpers, 3 way atv hitch, WARN XT25 Winch and mount, Kimpex fender guard foot rests, RICOCHET ARMOR front and rear a-arm guards all purchased from www.TheATVSuperStore.com Snorkel Your ATV snorkel system
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Old 12-29-2010, 05:53 AM
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This is a normal issue on thes machines.

It has to do with the tps adjustment.

Mine did it a few times when new. Now I have not had it happen in about a year and half. I think you just learn how ride it without the backfire.
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Old 12-29-2010, 11:16 AM
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It has to do with your engine breaking system (EBS) an d will do it if you suddenly let off your throttle when your moving. It does it mainly when new and will decrease over time. Our 2011's now have 400+ miles on them and our rides are usually about 40-60 miles each and ours both did it a lot (4-5 times) during our first ride (we ride somewhat agressively), and then less our second ride, less again our third ride, etc. Now at 400+ miles after several rides they hardly ever do it, I think my brothers did it once the entire last ride and mine didn't do it at all. Some of it is the machine breaking in and the rest is you learning the machines quirks and over time as it breaks in the backfires will all but go away.
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Old 12-31-2010, 05:28 AM
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thanks for all the help now i wont be worried when i hear it and it has happened less each time ive ridden
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Old 12-31-2010, 05:56 PM
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Thumbs up

My '09 SP XP 850 was doing the same...and would have a backfire every now and again...the thing...is it was loud...and scared folks that were near. Oops!

I found this video on youtube...so here is the procedure to adjust the trottle cable. Hope this helps...




biz
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^^^^^^^^^^^^^^^^^^^^^^^^
Took delivery on February 4, 2011
2011 Sportsman 850 Touring EPS -- Mine
2011 Sportsman 550 Touring EPS -- Wifie
~~~~~~~~~~~~~~~~~~~~~
Sold 2009 Sportsman XP 850 Sold
Purchase date: May 2009
Sold date: December 2010
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Old 01-01-2011, 12:37 PM
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Mine did the backfire thing also.after a few tanks never did it again.
it did scare the hell out of people though.
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Old 01-01-2011, 02:35 PM
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My '09 backfired a few times on me when it was new, dealer adjusted the throttle sensor and it's been fine since.
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