Race Gas? - The HuntingPA.com Outdoor Community
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post #1 of 11 (permalink) Old 05-16-2018, 12:47 PM Thread Starter
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Race Gas?

My ATV sits for long periods. I put about 35 miles on it per year (I need to start using it more). As a result, I have had problems with gas going bad. At the suggestion of a mechanic, I put 112 octane race gas in it. It is ethanol free. It seems to run fine with this gas although I know the high octane can reduce horsepower. Somebody told me that the high octane would cause the engine to run hot and could cause problems. Is this true?

It's a fuel injected Brute Force 750 and is all stock except winch and tires.
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post #2 of 11 (permalink) Old 05-16-2018, 12:52 PM
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If it is air cooled it just might make it run hoter. Just run regular and use fuel stabilizer like Staybil in your gas. I use Staybill in my gas cans for both my ATV and my snow blower and sometimes the gas sits til the following year and I have had no problems.
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post #3 of 11 (permalink) Old 05-16-2018, 01:06 PM
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Ethanol free gas is available at some stations usually 89 octane. Stabilizer is a good idea even without the ethanol if it sits for months at a time.
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post #4 of 11 (permalink) Old 05-16-2018, 01:55 PM
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Higher octane gas needs more compression to burn actually so if your motor doesn't have enough compression for the higher octane rated gas it wont burn it completely and leave a film or build up on your valves. It's all about compression numbers and bore size for octane rating. it wont make it run hotter it makes it run "cooler" if anything.

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post #5 of 11 (permalink) Old 05-16-2018, 03:52 PM Thread Starter
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Originally Posted by dragman View Post
Higher octane gas needs more compression to burn actually so if your motor doesn't have enough compression for the higher octane rated gas it wont burn it completely and leave a film or build up on your valves. It's all about compression numbers and bore size for octane rating. it wont make it run hotter it makes it run "cooler" if anything.
Thanks. That is kind of what I thought. The higher octane makes it more resistant to combustion and might reduce horsepower. I didn't think about build up. Once I run this tank down a bit I think I am going to start using VP small engine fuel with a fuel stabilizer. It is 94 octane and has no ethanol.

By the way, I have always used stabil ethanol treatment and still had problems with bad gas. The quads sits for months between uses.
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post #6 of 11 (permalink) Old 05-16-2018, 04:09 PM
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I use ethanol free in all my small engines. I don't care how much stabilizer you dump in... the ethanol is still there.
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post #7 of 11 (permalink) Old 05-17-2018, 10:50 PM
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I have had good luck with Star Tron and Lucas Ethanol fuel treatment and stabilizer.
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post #8 of 11 (permalink) Old 05-18-2018, 12:19 AM
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Yes it can cause problems. It depends on what blend your using though. More then likely you got a run of the mill 112. Most likely you may push some out the exhaust and you'll be fine.

Not all race gas is created equal. Way to many variables and blends out there.

Octane rating is just that a rating. It's mostly used for power you can make safely without knock. A lot goes to burn speed of the fuel. Different brands market fuel differently so you have to watch burn speed.

To many variables for what rating you can run and cant run in a fourstroke. Compression really only comes into play in 2 strokes for fuel rating.

Race fuel also goes bad when not sealed in a drum.

Last edited by gearhart15; 05-18-2018 at 12:32 AM.
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post #9 of 11 (permalink) Old 05-18-2018, 12:15 PM Thread Starter
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Originally Posted by gearhart15 View Post
Yes it can cause problems. It depends on what blend your using though. More then likely you got a run of the mill 112. Most likely you may push some out the exhaust and you'll be fine.

Not all race gas is created equal. Way to many variables and blends out there.

Octane rating is just that a rating. It's mostly used for power you can make safely without knock. A lot goes to burn speed of the fuel. Different brands market fuel differently so you have to watch burn speed.

To many variables for what rating you can run and cant run in a fourstroke. Compression really only comes into play in 2 strokes for fuel rating.

Race fuel also goes bad when not sealed in a drum.
I got the Dragon Racing Fuel Tarragon 112. Tarragon 112 - 5g pail - VoltageMX
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post #10 of 11 (permalink) Old 05-19-2018, 12:59 PM
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You should be ok. I highly doubt you run your quad hard enough to really hurt it. If you notice more bottom end power you should be fine. If you notice your pipes getting super hot drain it. I wouldn't worry to much about it though.

Race fuel still goes bad when not sealed. It's cheaper to run regular gas with a additive. And buy yourself a case of beer with the left over cash.
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