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premium / regular fuel
- ????
started by polarisorbust
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December 8th 2008 at 3:24 PM
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polarisorbust
Eat my roost !!!!
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627 Posts 
Group: Members
Member Since: December 21st 2005
Location: Morley, Michigan
Current Sled: 1998 XC 700
2008-2009 Miles: 1178 miles
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I have always put regular fuel in my sled(98 xc 700). I went for a ride this weekend, topped it off with premium accidentally. I get about 5 miles down the trail and noticed my exhaust was RED HOT! Would premiem fuel make it leaner? I have never had a problem before, but never ran premium. THE CARBS ARE CLEAN AS A WHISTLE!
98 XC700 97.3 mph 1000 ft.
00 XC500SP 45th Anniversary Ed.
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Site Supporter
Group: Site Supporters
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December 8th 2008 at 3:26 PM
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xcr440
Sundowners Trail Coordinator
xcr440 is drinking high lifes polishing the sleds. Who wants to help....
Updated Over 3 hours ago
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12581 Posts 
Group: Members
Member Since: February 1st 2003
Location: St.Germain/Edgerton, Wisconsin, USA
Current Sled: 03prox700/97xcr440
2008-2009 Miles: 610
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I have never had that issue and I ran prem and reg through my 98 700.
a good beer drinker isnt a picky beer drinker
Loggers.... Working their ass off so you can wipe yours!
"Steep ground is when your cutting a notch and notice a mountain goat looking at you like you are crazy." - Hexan
woodbooga: (WOOD-boog-ah), n. regional dialect, common to areas of New Hampshire and Maine including the towns of Ossipee, Alton, Farmington, Acton, and Lebanon; one who attempts to obtain free firewood to fuel woodburning appliances in an effort to mitigate expenses related to home heating with fossil fuels. Frequently used as a term of derision by non-woodburners who mock the presence of loose bark and other wood waste in the beds of their pickup trucks.
2003 Pro x 700 almond/blue,10-66 black/red team 719 T-flow, 440 mains
1997 xcr440 my clutch kit, 380 mains,T-flow
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December 8th 2008 at 3:31 PM
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zxkid
not really a kid anymore :(
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493 Posts 
Group: Members
Member Since: February 29th 2008
Location: N.Adams, MA, USA
Current Sled: 2004 F7 SnoPro EFI
2008-2009 Miles: 1312
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think it's coincidental that you put in Premium, I'd dig a little deeper into the problem
"To be old and wise, you must first be young and stupid"
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December 8th 2008 at 3:59 PM
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This post is considered "no good" by the community with a rating of -12. View it anyways?
Quote originally posted by zxkid
think it's coincidental that you put in Premium, I'd dig a little deeper into the problem
I agree.
Premium, or higher octanes in general, burn colder, and less fully than a lower octane. Thus the reason racers put the lowest octane possible without detonation in there sleds  . Take your carbs apart and clean them out, fully. Pilot and main jets included.
2005 Fusion 900cfi
Dynoport Can
SLP Torque Arm
1" predator track
--------
Dads:
03' RX-1er
Custom Graphics
4th wheel + Custom wheel kit
--------
Moms:
2000 SXr 600 Sleeper ( 700 triple big bore with cut 600 heads )
Stock elsewise
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December 8th 2008 at 4:01 PM
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Piped700XC
redneck sledhead
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44 Posts
Group: Members
Member Since: April 10th 2008
Location: Charlotte, michigan, USA
Current Sled: 98 Polaris 700xc
2008-2009 Miles: 250
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I've only ever run premium in all of my sleds and never had any problems.
I've got mud in my blood and ice in my veins.
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December 8th 2008 at 4:14 PM
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PolarisForLife
Junior Member
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137 Posts
Group: Members
Member Since: August 7th 2005
Location: Virginiatown, Ontario, Canada
Current Sled: Assault 800
2008-2009 Miles: 800
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I was always told the higher the octane, the hotter the burn
1989 Indy 500
2005 Sportsman 800 with 28" mudzilla's or stockers on black ITP 212 ss rims and K&N airfilter
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December 8th 2008 at 4:19 PM
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OhioPolarisKid
Advanced Member
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1155 Posts 
Group: Members
Member Since: January 22nd 2008
Location: Farmersville, Ohio, USA
Current Sled: 1999 Indy 500 XC SP
2008-2009 Miles: 1340
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Quote originally posted by PolarisForLife
I was always told the higher the octane, the hotter the burn
Ive heard opposite. But we have always ran premium in our sleds, and atv when we fill them up at the gas station. But i would think that switching fuel wouldnt cause that problem.
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December 8th 2008 at 4:21 PM
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octane debates come up all the time. the octane number doesn't mean it burns hotter or colder. it refers specifically to the fuels ability to resist premature detonation. higher octane fuel is more stable.
if someone can show proof that higher octane fuel burns colder i will gladly admit i'm wrong.
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- 2004 pro-xr 440/800: SLP single pipe, clutched, not enough studs, wacky oil tank mounting, crazy intake i made, REV seat/tank, C&A pro skis.
- 2006 mxzx 440 race sled
- 1989 indy trail
- 2001 800xcsp: rest in pieces.
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December 8th 2008 at 4:28 PM
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Quote originally posted by Customized89Trail
octane debates come up all the time. the octane number doesn't mean it burns hotter or colder. it refers specifically to the fuels ability to resist premature detonation. higher octane fuel is more stable.
if someone can show proof that higher octane fuel burns colder i will gladly admit i'm wrong.
First low grade gas:
Low grade gas is cheap, so everyone likes it. Is the most fast burning fuel you can get. It burns faster and hotter than the other fuels. It tends to burn unevenly and leave lots of deposits in your engine.
High grade gas:
High grade gasoline is made of longer molecular chains. Gas is usually rated in octane's which is some what misleading (see below) because octane's are a 8 molecular group chain in the petroleum family. It is the slowest burning gas, giving you a longer, and more even power stroke. It also burns colder, which is especially important for those of you that live in hot areas or if your car is prone to overheating. Running high grade will keep it cooler. It also tends to burn more completely, leaving less deposits and not sending as much back out the tail pipe.
http://imperialclub.org/Repair/Fuel/grades.htm
http://www.automotiveforums.com/vbulleti...78850.html
2005 Fusion 900cfi
Dynoport Can
SLP Torque Arm
1" predator track
--------
Dads:
03' RX-1er
Custom Graphics
4th wheel + Custom wheel kit
--------
Moms:
2000 SXr 600 Sleeper ( 700 triple big bore with cut 600 heads )
Stock elsewise
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December 8th 2008 at 4:35 PM
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Quote originally posted by BRP-4-LIFE
Quote originally posted by Customized89Trail
octane debates come up all the time. the octane number doesn't mean it burns hotter or colder. it refers specifically to the fuels ability to resist premature detonation. higher octane fuel is more stable.
if someone can show proof that higher octane fuel burns colder i will gladly admit i'm wrong.
First low grade gas:
Low grade gas is cheap, so everyone likes it. Is the most fast burning fuel you can get. It burns faster and hotter than the other fuels. It tends to burn unevenly and leave lots of deposits in your engine.
High grade gas:
High grade gasoline is made of longer molecular chains. Gas is usually rated in octane's which is some what misleading (see below) because octane's are a 8 molecular group chain in the petroleum family. It is the slowest burning gas, giving you a longer, and more even power stroke. It also burns colder, which is especially important for those of you that live in hot areas or if your car is prone to overheating. Running high grade will keep it cooler. It also tends to burn more completely, leaving less deposits and not sending as much back out the tail pipe.
http://imperialclub.org/Repair/Fuel/grades.htm
http://www.automotiveforums.com/vbulleti...78850.html
do you believe everything you read on the internet? you just gave references to other sources who use no references! it's the same thing over and over again on the internet. kids like yourself read stuff on the internet that someone else said then it becomes fact and you spread it. there's nothing in those links that comes from an official professional source. just because someone some where said "low grade is the fastest burning" and "high grade is the slowest burning" doesn't mean anything.
---------------------------
- 2004 pro-xr 440/800: SLP single pipe, clutched, not enough studs, wacky oil tank mounting, crazy intake i made, REV seat/tank, C&A pro skis.
- 2006 mxzx 440 race sled
- 1989 indy trail
- 2001 800xcsp: rest in pieces.
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December 8th 2008 at 4:51 PM
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Quote originally posted by polarisorbust
I have always put regular fuel in my sled(98 xc 700). I went for a ride this weekend, topped it off with premium accidentally. I get about 5 miles down the trail and noticed my exhaust was RED HOT! Would premiem fuel make it leaner? I have never had a problem before, but never ran premium. THE CARBS ARE CLEAN AS A WHISTLE!
sorry i got off topic in your thread a bit.
i'd say check for some other cause of a lean condition. maybe air leaking around the carb boots or cracked rubber in the boot somewhere? you said the carbs are clean, are all of the adjustments right? try a fresh tank of gas and see if it does it again? if you take the plugs out, does the engine turn over freely?
---------------------------
- 2004 pro-xr 440/800: SLP single pipe, clutched, not enough studs, wacky oil tank mounting, crazy intake i made, REV seat/tank, C&A pro skis.
- 2006 mxzx 440 race sled
- 1989 indy trail
- 2001 800xcsp: rest in pieces.
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December 8th 2008 at 9:25 PM
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fleshwound
Shake n Bake
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243 Posts
Group: Members
Member Since: September 24th 2005
Location: toronto, ontario, Canada
Current Sled: 05 Fusion 900
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Quote originally posted by BRP-4-LIFE
Quote originally posted by Customized89Trail
octane debates come up all the time. the octane number doesn't mean it burns hotter or colder. it refers specifically to the fuels ability to resist premature detonation. higher octane fuel is more stable.
if someone can show proof that higher octane fuel burns colder i will gladly admit i'm wrong.
First low grade gas:
Low grade gas is cheap, so everyone likes it. Is the most fast burning fuel you can get. It burns faster and hotter than the other fuels. It tends to burn unevenly and leave lots of deposits in your engine.
High grade gas:
High grade gasoline is made of longer molecular chains. Gas is usually rated in octane's which is some what misleading (see below) because octane's are a 8 molecular group chain in the petroleum family. It is the slowest burning gas, giving you a longer, and more even power stroke. It also burns colder, which is especially important for those of you that live in hot areas or if your car is prone to overheating. Running high grade will keep it cooler. It also tends to burn more completely, leaving less deposits and not sending as much back out the tail pipe.
http://imperialclub.org/Repair/Fuel/grades.htm
http://www.automotiveforums.com/vbulleti...78850.html
Stop giving the wrong advice and acting like you know what your talking about
2005 fusion 900
2000 xcr 800
07 ktm sxf 250
Quote originally posted by BRP-4-LIFE
If I don't keep this sled for the whole season, I promise to never sign on to Snowmobile Fanatics again.
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December 9th 2008 at 9:39 AM
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polarisorbust
Eat my roost !!!!
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627 Posts
Group: Members
Member Since: December 21st 2005
Location: Morley, Michigan
Current Sled: 1998 XC 700
2008-2009 Miles: 1178 miles
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I checked all of the adjustments, everything is at spec. I drained the fuel and topped off with regular. Going for a ride tonight, we'll see what happens. The engine is new last year, crank and all. I have never had a problem with it. 
98 XC700 97.3 mph 1000 ft.
00 XC500SP 45th Anniversary Ed.
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December 9th 2008 at 10:00 AM
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Rubi
Advanced Member
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1018 Posts
Group: Members
Member Since: January 1st 2007
Location: Alexandria, MN, USA
Current Sled: 2000 XCSP 600
2008-2009 Miles: 1071
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I also heard that high octane gas burns cooler. Heptane is more volatile than octane, thus octane resists combustion more, so it is used for high compression engines. Heptane also contains more potential energy, that is why it burns hotter and gives you more power. Not only have I heard this info in various places, but I have anecdotal evidence that supports it too. When I go out west, I get unreal gas mileage with the 85 octane gas because it has more power per gallon. Ethanol has very high octane, but it has very little power, or potential energy compared to gasoline.
1990 Indy 400 (Slightly modded with welded tunnel cracks and various used Indy parts from models throughout the 90's)
2006 Stihl Chainsaw
1980's Vintage Lawnboy Lawnmower
2005 Husqvarna Weed Whacker (It sucks to rewind the string, but that 31cc motor sure is torquey!)
2000 Polaris XCSP Edge 600 (1.5" Track, 22x40 gearing, Aaen exhaust, Student Driver pivot riser package)
2008 RMK 600 144"
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December 9th 2008 at 10:54 AM
[ Modified December 9th 2008 at 11:07 AM
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Octane is resistance to detonation.
Because it is resistance to detonation it is harder to ignight and it does burn cooler and slower than lower octane.
So to answer the original question, no. Higher octane is NOT your problem.
You will need to look for the actual cause or you are pretty much going to have the same problem again and again until the problem is found and fixed. You had it right up until this part:
Quote originally posted by BRP-4-LIFE
which is especially important for those of you that live in hot areas or if your car is prone to overheating. Running high grade will keep it cooler. It also tends to burn more completely, leaving less deposits and not sending as much back out the tail pipe.
Hot air is less dense with oxegen and so it makes a cooler burn than what cold air does. This is basic jetting.
As for the car that's prone to overheating, I'd be for looking for the actual cause of the overheating as the fuel did not cause this.
You were on the right track though
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December 9th 2008 at 11:34 AM
[ Modified December 9th 2008 at 11:39 AM
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MACHZRider
"!nmad !rettilps neelps pu deeps"
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447 Posts
Group: Members
Member Since: November 17th 2007
Location: West Chester, PA, USA
Current Sled: 2002 Arctic Cat ZL600 EFI
2008-2009 Miles: 712
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As far as the octane rating goes, just use what your manufacturer recommends. The higher the rating is sometimes better but not always. As stated above, the rating has a lot to do with detonation in the cylinders. Detonation occurs when there is still a fuel/air mixture in the cylinder AFTER the initial firing of the piston, which then ignites causeing a pinging or knocking in the motor. Some manufacturers recommend a higher octane gas which burns a little SLOWER which helps a complete burning of the fuel/air mixture and less knocking. Ski-doo recommends premium gas for my MachZ and I have used regular in it before. A little knocking but nothing crazy and no knocking when using the premium. No way will puting a higher octane hurt your engine at all. Definitely look deeper at other possibilities for your problem. Carbs, Intake, air filter, maybe look at the pipes themselves. Did you do any re-jetting of your carbs?
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December 9th 2008 at 11:46 AM
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polarisorbust
Eat my roost !!!!
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627 Posts
Group: Members
Member Since: December 21st 2005
Location: Morley, Michigan
Current Sled: 1998 XC 700
2008-2009 Miles: 1178 miles
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could it be a plugged silencer? I have mice in my garage and my sons exhaust was full of dog food. Maybe mine has some in it and plugging it.
98 XC700 97.3 mph 1000 ft.
00 XC500SP 45th Anniversary Ed.
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December 10th 2008 at 10:46 AM
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MACHZRider
"!nmad !rettilps neelps pu deeps"
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447 Posts
Group: Members
Member Since: November 17th 2007
Location: West Chester, PA, USA
Current Sled: 2002 Arctic Cat ZL600 EFI
2008-2009 Miles: 712
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Quote originally posted by polarisorbust
could it be a plugged silencer? I have mice in my garage and my sons exhaust was full of dog food. Maybe mine has some in it and plugging it.
It wouldn't hurt to check. Those mice can get in anywhere and you never know what they might stuff in there with them! If there is some sort of blockage I bet it would make the pipes hotter.
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December 10th 2008 at 11:21 AM
[ Modified December 10th 2008 at 11:22 AM
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polarisorbust
Eat my roost !!!!
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627 Posts
Group: Members
Member Since: December 21st 2005
Location: Morley, Michigan
Current Sled: 1998 XC 700
2008-2009 Miles: 1178 miles
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well I got as much dog food out as I could. put it back together and rode about 25 miles last night. ran nice and cool, no problems at all. must of been plugged just enough.
98 XC700 97.3 mph 1000 ft.
00 XC500SP 45th Anniversary Ed.
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December 10th 2008 at 1:43 PM
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brian126
Advanced Member
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1156 Posts
Group: Members
Member Since: November 27th 2005
Location: Brown County, Minnesota, USA
Current Sled: 07 Yamaha Phazer GT
2008-2009 Miles: 648
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Quote originally posted by MACHZRider
Quote originally posted by polarisorbust
could it be a plugged silencer? I have mice in my garage and my sons exhaust was full of dog food. Maybe mine has some in it and plugging it.
It wouldn't hurt to check. Those mice can get in anywhere and you never know what they might stuff in there with them! If there is some sort of blockage I bet it would make the pipes hotter.
^^^
When I put my snowmobile into storage for the summer I put some duct tape over the end of the exhaust pipe so that things have less of a chance at getting inside the exhaust.
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December 10th 2008 at 1:57 PM
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polarisorbust
Eat my roost !!!!
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627 Posts
Group: Members
Member Since: December 21st 2005
Location: Morley, Michigan
Current Sled: 1998 XC 700
2008-2009 Miles: 1178 miles
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Quote originally posted by brian126
Quote originally posted by MACHZRider
Quote originally posted by polarisorbust
could it be a plugged silencer? I have mice in my garage and my sons exhaust was full of dog food. Maybe mine has some in it and plugging it.
It wouldn't hurt to check. Those mice can get in anywhere and you never know what they might stuff in there with them! If there is some sort of blockage I bet it would make the pipes hotter.
^^^
When I put my snowmobile into storage for the summer I put some duct tape over the end of the exhaust pipe so that things have less of a chance at getting inside the exhaust.
I will now
98 XC700 97.3 mph 1000 ft.
00 XC500SP 45th Anniversary Ed.
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December 10th 2008 at 7:34 PM
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sgemt
Junior Member
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170 Posts
Group: Members
Member Since: February 3rd 2007
Location: Southern,, WI, USA
Current Sled: 2010 Grand Touring LE
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Bounce fabric softener sheets or steel wool work well to keep the critters out too. Funny where they'll make their homes ain't it??
Patiently waiting for the new sled to arrive!! 2010 Skidoo G/T LE 600 HO ETEC
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December 10th 2008 at 9:08 PM
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polaris_xc_racing
Average Member
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745 Posts
Group: Members
Member Since: April 7th 2007
Location: NY, USA
Current Sled: 1999 Polaris XC SP 700
2008-2009 Miles: 660
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This is an interesting thread as my pipe seems to be running kind of hot as well. Also some oil coming out where the pipe and the can meet together. I painted this pipe and I had this problem of oil coming out when the paint was still thick where the pipe meets the can and so I figured it was just not fitting in right because of the paint so I sanded it and sanded a little too much down to bear metal. Anyone know what the cause of this could be? Does this sound normal? Because to me it didn't. Also think I smell the oil burning just a little bit and it's not wasting oil so I know its the oil coming out of the exhaust. My hood gets quite hot too...Doh!
BTW polarisorbust sorry to hijack your thread
1999 Polaris XC SP 700
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December 11th 2008 at 7:15 AM
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polarisorbust
Eat my roost !!!!
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627 Posts
Group: Members
Member Since: December 21st 2005
Location: Morley, Michigan
Current Sled: 1998 XC 700
2008-2009 Miles: 1178 miles
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Quote originally posted by polaris_xc_racing
This is an interesting thread as my pipe seems to be running kind of hot as well. Also some oil coming out where the pipe and the can meet together. I painted this pipe and I had this problem of oil coming out when the paint was still thick where the pipe meets the can and so I figured it was just not fitting in right because of the paint so I sanded it and sanded a little too much down to bear metal. Anyone know what the cause of this could be? Does this sound normal? Because to me it didn't. Also think I smell the oil burning just a little bit and it's not wasting oil so I know its the oil coming out of the exhaust. My hood gets quite hot too...Doh!
BTW polarisorbust sorry to hijack your thread
not a problem, for your leak, take some high temp sylicone and put it on your joints and put it back together. let it dry over night, and it wont leak again.
98 XC700 97.3 mph 1000 ft.
00 XC500SP 45th Anniversary Ed.
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