1977 85 horse evinrude oil mix

[truckdrivinnut]

I have a 1977 85 horse evinrude out board and was curious what would be the proper oil/fuel ratio. Thanks in advance for any help offered.

 

[Joe Reeves]

Re: 1977 85 horse evinrude oil mix

That would be 50/1..... 1 pint of 50/1 TCW-III oil to 6 gallons of gasoline. A fuel octane rating of 87 will be fine.

 

[truckdrivinnut]

Re: 1977 85 horse evinrude oil mix

thanks alot there joe. I appreciate it.

 

[throwback2332]

Re: 1977 85 horse evinrude oil mix

50:1 with evinrude/johnson oil. I use 93 octane, the '77 owners manual recommends MINIMUM 89 octane.

 

[iwombat]

Re: 1977 85 horse evinrude oil mix

Not sure why you're running 93 octane. Today's methods of boosting octane with MBTE or alchohol are harder on an outboard than any benefits from the extra octane. Save some $$ and get the cheap stuff. Your motor and pocket book will be much happier.

 

[hitace]

Re: 1977 85 horse evinrude oil mix

in most places now they dont use MBTE or alchohol to boost octane. they use ethanol not sure the effect it has on outboards weather good or bad

 

[iwombat]

Re: 1977 85 horse evinrude oil mix

ethanol is a type of alcohol.