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Fuel in outboard #14072638 07/25/21 04:31 AM
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BassfisherHTX Offline OP
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What fuel type to yall use in the boat. I always put the premium gas in the boat. What do y’all use and is there any advantage to doing this. I have just been told to do it like this since I was a kid.

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Re: Fuel in outboard [Re: BassfisherHTX] #14072656 07/25/21 08:40 AM
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Read your owners manual. The engineers that designed that engine know what’s best for it. My Yamaha says 87 octane….that’s what goes in the tank.


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Re: Fuel in outboard [Re: SteezMacQueen] #14072684 07/25/21 11:10 AM
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My Merc 4-stroke runs 87

Re: Fuel in outboard [Re: BassfisherHTX] #14072694 07/25/21 11:31 AM
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The newer Yammie 4strokes, at least 2018, is recommended to run mid-grade 89.


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Re: Fuel in outboard [Re: SteezMacQueen] #14072965 07/25/21 05:07 PM
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Originally Posted by SteezMacQueen
Read your owners manual. The engineers that designed that engine know what’s best for it. My Yamaha says 87 octane….that’s what goes in the tank.


Exactly!!!... The smart guys who designed and manufactured your engine know best... 87 octane, a fuel stabilizer and an injector cleaner is all you need... Running too high of an octane could actually be a determent to the outboard... Dan


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Re: Fuel in outboard [Re: Dan21XRS] #14072969 07/25/21 05:12 PM
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Originally Posted by Dan21XRS
Originally Posted by SteezMacQueen
Read your owners manual. The engineers that designed that engine know what’s best for it. My Yamaha says 87 octane….that’s what goes in the tank.


Exactly!!!... The smart guys who designed and manufactured your engine know best... 87 octane, a fuel stabilizer and an injector cleaner is all you need... Running too high of an octane could actually be a determent to the outboard... Dan

exactly, my old 1979 Mercury Black Max manual said premium would burn too hot and damage the motor...I always run regular and it is still running...


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Re: Fuel in outboard [Re: SteezMacQueen] #14072979 07/25/21 05:26 PM
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Originally Posted by SteezMacQueen
Read your owners manual. The engineers that designed that engine know what’s best for it. My Yamaha says 87 octane….that’s what goes in the tank.

Yes, most of the old 2 strokes recommended 87, running higher could cause problems, and had also been said the new Yamahas recommend 89. 93 premium is not a good idea if its not made for it.

Re: Fuel in outboard [Re: bronco71] #14073091 07/25/21 08:29 PM
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Originally Posted by bronco71
Originally Posted by Dan21XRS
Originally Posted by SteezMacQueen
Read your owners manual. The engineers that designed that engine know what’s best for it. My Yamaha says 87 octane….that’s what goes in the tank.


Exactly!!!... The smart guys who designed and manufactured your engine know best... 87 octane, a fuel stabilizer and an injector cleaner is all you need... Running too high of an octane could actually be a determent to the outboard... Dan

exactly, my old 1979 Mercury Black Max manual said premium would burn too hot and damage the motor...I always run regular and it is still running...


Lol. Higher octane burns cooler and slower. I find it hard to believe Mercury engineers would say it burns to hot

Re: Fuel in outboard [Re: BassfisherHTX] #14073139 07/25/21 09:29 PM
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So if you had a choice to burn 87 non leaded or 91 leaded (no alcohol) which would it be.. If you didn’t use motor but like 5-6 months?

Re: Fuel in outboard [Re: SteezMacQueen] #14073152 07/25/21 09:45 PM
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Originally Posted by SteezMacQueen
Read your owners manual. The engineers that designed that engine know what’s best for it. My Yamaha says 87 octane….that’s what goes in the tank.


+1


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Re: Fuel in outboard [Re: rangerb] #14073171 07/25/21 10:08 PM
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Originally Posted by rangerb
So if you had a choice to burn 87 non leaded or 91 leaded (no alcohol) which would it be.. If you didn’t use motor but like 5-6 months?

Lol you can’t get leaded gas it’s illegal at least for on the road vehicles. All gas is unleaded. All gas has ethanol unless marked ethanol free. For most outboards using regular unleaded is all you need. Ethanol free is the best choice if you can find it and if you don’t use your boat every couple weeks or if you don’t have newer ethanol approved fuel lines

Re: Fuel in outboard [Re: BassfisherHTX] #14073178 07/25/21 10:14 PM
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Meant ethanol free…🙁. Believe the outboard Manuel states at least 87 octane but does not say you can’t use over. My dealer always recommended 89 because might lose some octane. but would think 91 would lose some if it sits a while. Motor seems to run better on non alcohol.

Last edited by rangerb; 07/25/21 10:17 PM.
Re: Fuel in outboard [Re: BassfisherHTX] #14073198 07/25/21 10:43 PM
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Been running super in my Merc 250 2 stroke for 7 years. Before that ran premium in my old 90hp 2 stroke for 17 years and knock on wood I haven’t had any issues yet


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Re: Fuel in outboard [Re: BassfisherHTX] #14073269 07/26/21 12:37 AM
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Put in what your manufacturer says to use.

Re: Fuel in outboard [Re: SteezMacQueen] #14073284 07/26/21 12:57 AM
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Originally Posted by SteezMacQueen
Read your owners manual. The engineers that designed that engine know what’s best for it. My Yamaha says 87 octane….that’s what goes in the tank.


Same as my Yamaha so that is what she gets! cheers


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