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post #1 of 19 (permalink) Old 03-15-2011, 08:34 PM Thread Starter
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Fuel Type

Picking up 2011 850 Touring LE this week. What kind of gas are you guys running. I've read somewhere that Super Unleaded is recommended. Also talked to someone hear where he has had some problems with backfiring on this machine.

Any suggestions?
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post #2 of 19 (permalink) Old 03-15-2011, 09:22 PM
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We went through this awhile ago, end result was regular unleaded.
But....use Seafoam or Star*Tron added to your gas. Ethanol likes water.

Just thinking, what does the Owner's Manual suggest for the 2011's?

Take care,
Scott Deeter

1998 Scrambler 400 4x4 2 stroke (SOLD)
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post #3 of 19 (permalink) Old 03-16-2011, 12:26 AM
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I run hi test, treated with SEA FOAM!!

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post #4 of 19 (permalink) Old 03-16-2011, 01:34 AM
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Quote:
Originally Posted by cwlongshot View Post
I run hi test, treated with SEA FOAM!!

CW
CW,

What happened to the Star*Tron you turned me on to?

Take care,
Scott Deeter

1998 Scrambler 400 4x4 2 stroke (SOLD)
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post #5 of 19 (permalink) Old 03-16-2011, 05:51 AM
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My backfiring went away after 5-8 hours, Break-in, computer re-learn or something. I use super un-leaded, I don't put enough miles on it to worry about .30 per gal. Mash the go button and have fun.
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post #6 of 19 (permalink) Old 03-16-2011, 07:35 AM
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93 octane always, & Sea Foam a couple times each year. Its probably overkill, but I just feel better about it since I blew a hole in my piston on my old quadsport using regular gas, it also had an 11:1 compression ratio. I have been told that higher octane runs cooler. The manual only calls for 87 octane or better but my dealer told me to run "at least 89" on my new 850.

2011 Sportsman Touring 850 (current)
2006 Outlander 400 (Sold)
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1997 Explorer 500 (Traded)
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post #7 of 19 (permalink) Old 03-16-2011, 07:46 AM
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I always was told 93 burns hotter than 87

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post #8 of 19 (permalink) Old 03-16-2011, 08:09 AM
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I think it burns cooler but I'm sure someone who really knows their stuff will check in soon. We'll both learn then. I don't want to put out bad information.

Last edited by Dbez1; 03-16-2011 at 08:13 AM.
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post #9 of 19 (permalink) Old 03-16-2011, 08:11 AM
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Yea 87 is good enough!

I tried setting my password to "penis" but it said my password wasn't long enough...
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post #10 of 19 (permalink) Old 03-16-2011, 08:33 AM
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Dbez1 I agree go 93 octane. Higher compression ratio require higher octane fuel or it will detonate. Detonation caused the timing to advance and the heat from that caused the hole in the piston. If the air/fuel ratio is correct the octane itself won't change the heat that much. Now theres several things that change detonation, Shape of combusion chamber, compression ratio, engine temp., cam profile, sharp edges inside of combusion chamber that may glow with heat and air/fuel ratio. So yes stick with 93 octane. .30 cents a gal. is cheep insurance.
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