Re: 1989 4 hp Evinrude Gas Mixture
Bob, I'd run your motor at 50:1. For awhile , OMC used the 100:1 spec. , I guess figuring that most people use the motor for trolling and the extra oil was not that necessary. Less oil ment less plug fouling but can be risky at higher RPM's. To be safe, run it at 50:1.