Midgrade vs Regular gas

[URBANHILLBILLIE]

Hi, I have a 1976 115hp johnson seahorse outboard.Would it help to use midgrade instead of regular gas to improve performance? THANKS FRANK

 

[captain spike]

Re: Midgrade vs Regular gas

nothing but 87 octane<br /><br /><br /> <br /> ***1971 18'winner 1969 115 jonny***<br /> "THURSDAY"

 

[JB]

Re: Midgrade vs Regular gas

Ditto spike.

 

[Dhadley]

Re: Midgrade vs Regular gas

And Champion plugs.

 

[mikeyzx2]

Re: Midgrade vs Regular gas

shoot don't ask this question on John's Old Mercury forum.......they are big on recommending aviation fuel. I personally have tried 89 and 87, but didn't notice a difference. Dhadley, they think Champs are sucky sparkplugs too as well as gas less than premium. <br /><br />I would stick to what OMC recommends.

 

[Pony]

Re: Midgrade vs Regular gas

Merc guys would think that of champions.......their plugs of choice are NGKs. Johnnyrude engines on the other hand don't like them.

 

[itstippy]

Re: Midgrade vs Regular gas

OMC engineers designed the motors to run on 87 octane and Champion plugs. It's not a matter of "better" plugs or gas, it's a matter of what's better for the outboard motor as designed. Run fresh 87 octane gas and Champion plugs in your OMC's. Run whatever the Merc experts say to use in your Merc's. Those old boys with the slide rules and pocket protectors and "high water" pants that designed the Merc and OMC motors were GOOD. Follow the designers' specs and your outboard will live forever and perform beautfully. Deviate from the factory specs only if you are a bonifide outboard performance specialist out to win the race and longevity be damned.

 

[WillyBWright]

Re: Midgrade vs Regular gas

Octane Schmoctane!!! Alcohol is an outboard's enemy. That's how most higher octane fuels get the additional octane, alcohol. You have a 2-stroke that needs the oil mixed with the gas. Oil doesn't mix with alcohol worth a crap.

 

[DJ]

Re: Midgrade vs Regular gas

OMC engineers designed the motors to run on 87 octane and Champion plugs. It's not a matter of "better" plugs or gas, it's a matter of what's better for the outboard motor as designed. Run fresh 87 octane gas and Champion plugs in your OMC's. Run whatever the Merc experts say to use in your Merc's. Those old boys with the slide rules and pocket protectors and "high water" pants that designed the Merc and OMC motors were GOOD. Follow the designers' specs and your outboard will live forever and perform beautfully. Deviate from the factory specs only if you are a bonifide outboard performance specialist out to win the race and longevity be damned.<br />

Very well said. DITTO!!!

 

[Pony]

Re: Midgrade vs Regular gas

Well said itstippy- thats what i was trying to say. As you can see a did a poor job of it.