1981 Evinrude 9.9 HP oil fuel mix, trolling in Cold water

[Jim Robbins]

What is a good and safe fuel & oil mix for my out board motor when trolling in cold (40 to 50 degs.)Great Lakes freshwater? I will have to remove and clean plugs after every 6 - 8 hours of trolling.
Thanks

 

[oldcatamount]

Re: 1981 Evinrude 9.9 HP oil fuel mix, trolling in Cold water

I wouldn't suggest that you go lower than 50:1 mixture. You might try the next hotter spark plugs but don't go more than the next closest number. Or, gap your existing plugs a little wider.

 

[the machinist]

Re: 1981 Evinrude 9.9 HP oil fuel mix, trolling in Cold water

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[kbait]

Re: 1981 Evinrude 9.9 HP oil fuel mix, trolling in Cold water

Run at 50/1, ensure thermostat is functioning correctly and is keeping the powerhead warmed to optimal temperature, install correct spark plugs gapped to .030". Should idle all day w/o ever fouling a plug if the low speed jet is set correctly. See top secret files sticky at the top of this forum for more on that.. Good luck!