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06-15-2010, 09:29 AM
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Junior Member
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Member #4783
Join Date: May 2010
Location: Thompson Manitoba
Posts: 23
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big bore kits?
does anybody know of any big bore kits for the 850 xp. if i gotta replace motor i should do it right! i cant seem to find any
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06-23-2010, 01:31 PM
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Junior Member
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Member #4783
Join Date: May 2010
Location: Thompson Manitoba
Posts: 23
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really nobody on this forum knows of any performance companies for the polaris atv's
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07-07-2010, 08:21 AM
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Polaris ATV Legend
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Member #5629
Join Date: Jun 2010
Location: Southern West Virginia
Posts: 1,631
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Try speedwerx.com. hope this helps.
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Con
 2007 Sportsman 800 efi , L&R tall windshield, Viper Max 4000 lb. winch with 3/16" Amsteel rope by Atv Winch Rope, 25' Amsteel tow rope by Atv Winch Rope, RDC fairlead, RDC deluxe gas cap, RDC shifter, RDC overflow bottle cap, RDC 2" lift , 27" Maxxis bighorns s/w on Vision Outback 12" wheels, Uni air filter, Dalton o/bl primary clutch spring, front and rear brushguard, front and rear rack extensions, and a SanAngelo backrest
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08-20-2010, 07:34 PM
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ATV Enthusiast
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Member #5124
Join Date: May 2010
Location: las vegas,nevada
Posts: 77
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rath racing,speed werxs,procom limiters,comet clutches,gorilla axles,and there's a few more
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 in the world of outlaws,we band 2gather and run as the fastest of the fast.Laughing at the yamahoppers,and the rest of them slow rides outhere  pilot license required,i meant firearms,two gun minimum!!!!!!!!!!!!!!!!!!!!and maybe a few grenadiers  not here
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08-21-2010, 09:10 PM
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ATV Enthusiast
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Member #6469
Join Date: Aug 2010
Location: maryland
Posts: 35
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Try USNICOM (send them your cylinder and they can make it accomodate whatever size piston you want) or AAEN or maybe even the big name places like Vito's or Trinity could help you out. All a big bore "kit" has is a stock cylinder over bored and/or sleeved with a larger diameter piston, then you send them back your cylinder and they refund you a core charge. If it doesn't come with a cylinder it is just a piston ring and gasket set someone is trying to charge more for. If you have your own cylinders opened up it will cost less probably almost half. You might have to do it that way if there is no kit available anyway. Then you can send you heads with your cylinders and have a nice valve job done, new seals put in, maybe even some port work (anyone with a flow bench should be able to easily get you an extra 5-10 hp with bowl porting and porting and polishing the runners on a twin so it should be well worth the $) then just re install your own parts.
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2001 TrailBlazer 250
1994 300 4x4
2004 Raptor 660R 727 Stage IV
2010 Eagle 110 mini utility
2003 Cannondale Speed 440
1951 Chevy Styleline
1972 Firebird Formula
2009 Wrangler Unlimited 3" lift
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08-22-2010, 02:08 AM
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Extreme ATV Enthusiast
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Member #6015
Join Date: Jul 2010
Location: Arizona
Posts: 139
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Really don't know why you want to waste your money unless you are cross country racing . You could never beat a built brute in a drag. Even without nos I can beat built sport bikes with 840 brute. . With NOS only thing beating me is ridged frame banshees bikes and then its close. Who gets the best light. Don't waste your money building a drag bike unless its a mud bike with gorilla axles would maybe worth it. I have a 20,000 dollar brute that can't be beat by any utility straight drag and only a couple sport bikes. I raced a Reny that claimed he was never beat a month ago and beat it by 4 quads straight up 300'. The guy was immediately claiming I was cheating with my BBK 840. I thought it was funny actually.
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2010 Sportsman 850XP EPS, 3500 Polaris winch synthetic cable and remote, front and rear brush guards, 5 HID lights, lock and ride rear box, Bighorn 26" tires on stock rims. Hand and thumb warmers.
Brute Force AMR 840 13.1-1, X4 Cams, Muzzy Pro, over-sized 39MM carbs, plus 1.5 mm over size valves, Big Kev performance full race port, JH machine clutch, programmable dynatek, Boss Noss wet nitrous system.
Last edited by archer; 08-22-2010 at 02:48 AM.
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09-05-2010, 05:49 PM
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Junior Member
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Member #6739
Join Date: Aug 2010
Location: Philadelphia
Posts: 12
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Can I port and polish my 850 xp without installing new pistons
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