What octane fuel for "91" 70hp Evinrude?

babes@sledbabes.com · #1 July 15th, 2001, 01:36 PM

Does anyone have an idea which octane would be best to run in a 1991 70hp Evinrude VRO?

Walter: did you check out sledbabes.com ?

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JB · #2 July 15th, 2001, 02:18 PM

Hi, Babes. Unleaded regular, 87 octane. No alcohol.

Red sky at night. . . .

JB

babes@sledbabes.com · #3 July 15th, 2001, 02:24 PM

Thank you JB , we were not sure if a higher octane should be used.

Thanks,

Dona

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Dhadley · #4 July 15th, 2001, 02:36 PM

87 is right. NOTHING higher. And Champion plugs only.

Good luck!

babes@sledbabes.com · #5 July 15th, 2001, 02:50 PM

Thanks for the info Dhadley!

kevlar3000 · #6 July 15th, 2001, 04:50 PM

Here it goes again lol. Here in Minneapolis

our fuel is oxygenated, but we can find a few places with non-oxygenated 91 octane. Oddd1 and Grubbs marine at oldmercs.com said that would probably be the better of the choices that I have. Oddd1 also mentioned that going .2 ( I believe , have to re check his post ) larger on my jets would also curb the lean running conditions with oxygenated fuel. The current copy of the Clymers Merc book at my library says to run 89 octane for this vintage engine, but it makes no mention of the ethanol issue. So what do you guys think? The more opinions the better. I noticed the person who posted this message is also from Minnesota too. There is a bunch of ethanol in this state. Heck, we gotta sell the corm somewhere...

kevlar3000 · #7 July 15th, 2001, 05:11 PM

oh, I forgot to mention, this is a link to another bit of info. www.maxrules.com/fixnewsletter.html.

If you page down to a post from 8-18-2000 there is another opinion re 87 octane.

I also found some interesting tidbits searching google.com under oxygenated fuel, and also non oxygenated fuel, there were some real interesting article links as well.