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05-08-2011, 05:56 AM
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Junior Member
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Member #14821
Join Date: May 2011
Location: ma
Posts: 7
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has anyone had problems with the 850xp back fireing on slowing down from moderate speed ? any remedies?
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05-08-2011, 12:47 PM
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Extreme ATV Enthusiast
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Member #12480
Join Date: Feb 2011
Location: Walker, MN
Posts: 206
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It seems common that this will happen during the first 100 miles, both mine and my buddies did.
ECU learning perhaps?
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05-12-2011, 06:54 PM
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Junior Member
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Member #14014
Join Date: Apr 2011
Location: Bouse, AZ
Posts: 12
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Well Polaris finally solved the problem. I picked up the 850 yesterday and rode 15 miles before I cut a tire and there was no oil in the air breather box. Today I rode 120 miles of rough trails and a little high speed dirt road. No oil in the air breather box. Polaris actually sent the dealer a prototype of a fix they are putting into production. It is simple. They remove the PCV and replace with an open large hose with a neckdown to the original hose. This lets any oil that blows by the labyrinth plate accumulate in the large hose and then run back down into the valve cover. The service manager contacted Dean Headland with Polaris Tech R & D to get the fix. The don’t have part number yet.
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08-08-2011, 05:46 PM
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ATV Enthusiast
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Member #12608
Join Date: Mar 2011
Location: Rio Rancho NM
Posts: 65
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I got the 850 X2 LE and I love it. Hauled wood in it and installed a winch and Koplin LED lighting. Now Just get the wife in it...
__________________
Redneck Ron
2011 Polaris 850 X2 W/ Polaris Front and Rear Bumper, Polaris Heated Thumb and Hand Grips, Kolpin LED Lights, Warn 3K winch, Modifed and Improved Lil Mule X2 Rack, Roto Pax Fuel Can, Polaris High Windshield, Kolpin over fenders and ITP Baja Cross tires on ITP SS212 Machined rims. Trying to get EPS on the ATV
Rio Rancho NM
High Country ATV Explorers
NMOHVA Trail Ambassador
New Mexico OHV Advisory Board
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09-15-2011, 05:06 PM
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ATV Enthusiast
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Member #12608
Join Date: Mar 2011
Location: Rio Rancho NM
Posts: 65
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How did you get around the gas tank issue concerning adding the power steering
__________________
Redneck Ron
2011 Polaris 850 X2 W/ Polaris Front and Rear Bumper, Polaris Heated Thumb and Hand Grips, Kolpin LED Lights, Warn 3K winch, Modifed and Improved Lil Mule X2 Rack, Roto Pax Fuel Can, Polaris High Windshield, Kolpin over fenders and ITP Baja Cross tires on ITP SS212 Machined rims. Trying to get EPS on the ATV
Rio Rancho NM
High Country ATV Explorers
NMOHVA Trail Ambassador
New Mexico OHV Advisory Board
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09-29-2011, 03:26 AM
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Junior Member
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Member #19118
Join Date: Sep 2011
Location: Cary N.C.
Posts: 1
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I'm triing to find 20 over pistons or something to rebuild my 2011 polaris 850xp eps. I have to bore it atleast 10 over, any suggestions?
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02-07-2012, 10:56 PM
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Extreme ATV Enthusiast
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Member #22232
Join Date: Jan 2012
Location: Innisfree, Alberta
Posts: 246
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Had my 850X2 now almost a month. Just finished installing a 3000 winch on it. Unbelievable power. Can't wait to play in the mud with it. 
__________________
2011 850 X2, Smittybilt 3000 XRC winch. Front steel rack extension. Winch saver. Lock and Ride Windshield. 27 inch Zilla Tires. Moose Front Bumper. Remote Booster Cables. Quadovator Reverse Overide Switch. Polaris Plow. Rear A Arm Guards.
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03-02-2012, 05:06 PM
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ATV Enthusiast
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Member #17133
Join Date: Jul 2011
Location: duluth mn
Posts: 74
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If I remove the felt for the breather will I get dust in there??
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03-02-2012, 06:26 PM
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Extreme ATV Enthusiast
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Member #12480
Join Date: Feb 2011
Location: Walker, MN
Posts: 206
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You shouldn't unless you have a serious problem with the valve cover gasket. As far as I can tell the felt is useless and just causes oil to get sucked up into the air box once the felt is saturated in oil.
From the action on this forum you can feel safe that hundreds of people have used this fix (including me) without a problem. 
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03-02-2012, 06:30 PM
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ATV Enthusiast
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Member #17133
Join Date: Jul 2011
Location: duluth mn
Posts: 74
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Felt in winter months
How about not having it (felt) in the winter months?
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