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Old 07-09-2019, 06:26 AM   #11 (permalink)
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yup race fuel will eat up stuff. nasty shit. there are a number of very bad chemicals in it. don't get it on your skin or hands either. it will get into your blood stream very quickly. av gas is 100LL meaning 100 octane low lead. the problem with it is sleds are relativity low compression. while the higher reed vapor pressure is good for cold weather. using a higher octane fuel when not needed can cause incomplete burn and starting/running issue's.

best fuel for newer sleds is 93/95 octane sunoco. either with or without ethanol. fresh ethanol fuel will run cooler and build more power. we see it on a dyno. running both back to back. the problem is sitting. ethanol is a polar solvent. meaning it readily mixes with water. just like phosphate Easter brake fluid.( DOT 3/4)
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Old 07-09-2019, 11:44 AM   #12 (permalink)
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Originally Posted by SouthernTierSwitchback View Post
I left some high octane VP in my motocrosser and it really screwed up orings and seals over the winter. From the petcock right through to the carb. Sucked. Wont do that anymore. Drain the shit out and dump it in the truck and call it a day
I use to run a 50/50 mix phillips B32 race gas and 89 plus pump gas in my hare scrambles bikes, never had an issue. Those 125 cagivas ran strong on it. I use run ice ovals during the winter on the same bikes. They only were left sitting idle maybe a month tops.
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Old 08-09-2019, 11:32 AM   #13 (permalink)
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Just to be clear, I utilize aviation fuel for storage only. No ethanol and does not degrade like pump gas. Have been using for years in all my small engines in long storage. As far as harming o-rings and seals, That would not work well for passenger planes LOL don't think that is the case with aviation fuel, race fuels are different. I drain the tank and put in fresh fuel before each season, I don't run with aviation fuel.
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Old 08-09-2019, 11:44 AM   #14 (permalink)
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Why not just use Premium Non-Oxy fuel year round, for storage as well? I don't understand why you would want to empty gas, put in different gas, just so you can empty it again in 6 months.
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Old 08-09-2019, 11:59 AM   #15 (permalink)
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Why not just use Premium Non-Oxy fuel year round, for storage as well? I don't understand why you would want to empty gas, put in different gas, just so you can empty it again in 6 months.

Just in case there is sweating/condensation inside the tank during storage adding water to the fuel. Only need to take a gallon or so out before fresh goes in. Lots of engine failures are due to water in fuel. Difficult to find non ethanol premium in my area plus put some in a glass jar and see what happens after a month or two, it separates and looks like salad dressing! non ethanol does not mean good shelf life imo.
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Old 08-09-2019, 01:56 PM   #16 (permalink)
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Just in case there is sweating/condensation inside the tank during storage adding water to the fuel. Only need to take a gallon or so out before fresh goes in. Lots of engine failures are due to water in fuel. Difficult to find non ethanol premium in my area plus put some in a glass jar and see what happens after a month or two, it separates and looks like salad dressing! non ethanol does not mean good shelf life imo.
I get the whole condensation thing, this is why I FILL my tank with Premium non-oxy, and run the sled every 2-3 weeks, to circulate the fuel. No space for condensation either.

I know that is not an option for many people, but it keeps the fuel fresh.
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Old 08-09-2019, 10:29 PM   #17 (permalink)
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I get the whole condensation thing, this is why I FILL my tank with Premium non-oxy, and run the sled every 2-3 weeks, to circulate the fuel. No space for condensation either.

I know that is not an option for many people, but it keeps the fuel fresh.
ethanol is what is added for octane. and is very good at this. the issue is sitting for months absorbing water out of the air. worse in carb. stuff than closed loop E.F.I. systems. but what is added to raise the octane in non ethy fuel? better check that. because it can be worse than ethanol fuel. lead is the best. that's why av gas and race fuel last way better. but lead isn't good for your head. remember MTB? this stuff is worse than ethanol ever thought to be. leaking under ground tanks contaminated many private wells.

nothing wrong with fresh ethanol fuel. fresh is the key word here. we are seeing very bad things happening with non ethanol fuel over time as well. careful what you wish for. neither is very good at long term storage.
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Old 08-10-2019, 09:17 AM   #18 (permalink)
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Just add stabilizer and start every so often and fully warm up. Never a problem
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Old 08-14-2019, 10:10 AM   #19 (permalink)
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Any marina will have recreational mid grade, just use that
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Old 08-14-2019, 02:06 PM   #20 (permalink)
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Quote:
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Just add stabilizer and start every so often and fully warm up. Never a problem
drain tank into truck. Refill with 1.5 gallons of Fresh Premium fuel with few ounces of seafoam treatment. Start every few weeks.

Start of season...dump whatever is left or just top up with Full tank of Fresh premium. Drive as normal.

This works for me.
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