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Polaris Sportsman Discussions for the Polaris Sportsman 90, 300, 355, 400, 450, 500, 550, 600, 700, 800, 850

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Old 09-26-2011, 11:12 PM
pshuman's Avatar
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What type of gas ?

New to sport. I just bought a 2012 500 sportsman, and all of my friends with atvs say I should only use 93 octane because of the ethanol crap. Just wondering what everyone else uses.
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  #2 (permalink)  
Old 09-27-2011, 01:24 AM
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You can run 87 and be fine... All of the octanes have Ethanol in them, unless you are getting race gas.
2006 Sportsman 700 EFI---29.5 Outlaws, gorilla axles, heelclicker clutch, 2" lift, snorkeled, Rad relocated
2006 Sportsman 500 EFI
-28" Outlaws, Rad relocate, QSC kit, snorkeled, ODI grips, 4 speaker stereo.SOLD
2005 Yamaha Grizzly 686 BBK & Mudbuster cam
-28" Outlaws, Rad relocated, Snorkels, Exhaust snorkel, fan over ride switch, clutch kitSOLD
2009 Polaris RZR LE--27" Mudzillas, snorkelsSOLD
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Old 09-27-2011, 02:46 AM
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I agree with your friends, but know that not all areas of the country use the ethanol in the same amounts...

I use hi test (Highest octane available) AND Sea Foam (1OZ per gal) in most every tank ful. I read FAR TOO MANY little annoying issues related to fuel and I simply would rather be defensive than offensive.

The factory recommends 87 octane as all that's needed.

2007 Polaris Sportsman 700 EFI
Running 26" Maxxis Big Horns on Crusher Black alloy rims, 1.25'' Spacers, EPI clutch kit W/spring mods, HD springs F&R, Moose front/Ricochet rear CV guards, Moose tank bag, Polaris rack extensions, Lock-N-Ride lo & hi windshields, Acerbis hand guards, CUSTOM mirrors & mounts . A 3000# Gorilla winch, W/Am-Steel blue synthetic line, running thru a winch saver and an aluminum fairleed. Thor's foot pegs and CUSTOM rear rack support frame. L&R WES seat box W/LED light & internal 12V plug. L&R Sportsman Box W/ internal multi 12V and USB plugs. CUSTOM front and rear mud flaps, CUSTOM dual side mounted 1.5 Gal Kolpin gas cans, Modified stock muffler with a rear exit & 800 air box lid W/UNI air filter, for better flow in & out.

Next mods: Thor fender flairs & 800 Head pipes.

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Old 09-27-2011, 03:40 AM
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Use whats the cheapest, and use stabilize (or whatever the name is) for over winter!
I tried setting my password to "penis" but it said my password wasn't long enough...
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Old 09-27-2011, 04:13 AM
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I too use 89 or 93 most of the time. It is my understanding that the higher grades are currently limited in the % of alcohol allowed. There is also a push to increase the alcohol content for lower grades which will cause even more problems.
If you read closely, the manufacturers recommend using fuel that is at LEAST 87 octane. Another issue for me on the 800 is mpg. I need all I can get. I enjoy hiking too but only if that's what I left the house planning to do that day.
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Old 09-27-2011, 05:03 AM
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I use 87 because in RI, all grades contain 10% ethanol, so paying extra yields no benefit. These low compression engines run fine on 87 and its actually what the factory recommends. I spend the extra coin on seafoam or it's equivalent and run some in every tank to counteract the negatives of the ethanol and hence water particularly with a carburated machine. My .02
2013 Polaris XP 850 HO LE EPS
  • Full Ricochet Armor (Black Anodized), ATV GURU Cobra F & R Brush Guards, Polaris L&R rear box w/Backrest & Bags, Scrambler LE Hand Guards, Symtec Heat Demon Grips, Rotopax 2+2
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  • 25" GBC Spartacus, EPI Clutch Kit, Full Ricochet Armor, Polaris 2500 lb Winch Rear Box & Hand Guards, SuperATV Bumpers
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Old 09-27-2011, 06:06 AM
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Non ethanol gas IS available in Virginia for about .05 cents more per gallon.
2007 Sportsman 800
1300 miles, mostly at Hatfield-McCoy trails, WVa.
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Old 09-27-2011, 06:25 AM
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I run 91 octane in my atv's. Don't know if the 500 needs it, but with 11:1 compression the 850 likes it.
'11 XP 850 EPS, 28" Kenda Bearclaw HTR's on STI HD2 Wheels, Warn XT25, Ricochet Ultimate protection, Elka Stage 1 shocks, QSC clutch kit
'15 Sportsman 570 Touring EPS, 26" Kenda Bearclaw HTR's on ITP Delta Steel wheels, Warn Vantage 3000
'09 Sportsman 500 EFI HO, 26" Maxxis Bighorns, Polaris 2,500 lb. winch, Cycle Country plow (SOLD)
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Old 09-27-2011, 06:28 AM
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I use premium fuel for my ATV. I don't burn through THAT much, so the extra cost isn't an issue. I dont buy it because of the higher octane rating, that ONLY matters in the vehicles with high compression engines. I use Shell V-Power because V-power is supposed to have additives in it that keep the fuel system clean. It makes me feel better about it anyway lol

Here is an interesting read on the octane myth

Gasoline/ethanol, or E10 has 3.3% less, energy than regular gasoline, so 3.3% more is required for the right mixture. (worse fuel mileage) It isn't good for anything that doesn't have O2 sensors and EFI or feedback carb or an adjustable main jet in the carb. Fixed jet carbs have to be re-jetted to run the proper mixture. I would try and run a non ethanol fuel if I had a Sportsman 500.
Lead, follow, or get out of the way. -Thomas Paine

Last edited by Brandoh; 09-27-2011 at 06:30 AM.
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Old 09-27-2011, 06:45 AM
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I use all 3-87, 89, 93. Depends on the price @ the time. The only constant is
the addtion of SEA FOAM!!! Great stuff!! I
2011 Sportsman 500 H.O. Green
14" STI Wheels-26" Mud Trax X/L's
2500# polaris winch
Ricochet a-arm guards
Rev. override kit
Hid 3 light kit
3 light mod. w/relay

Uni air filter on both

2011 Sportsman 500 H.O. Red
Ricochet a-arm guards
Hid 3 light kit
3 light mod. w/relay
Winch,wheels & tires still to go!
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