Way back when I had a couple 30HP Evinrude engines (not at the same time). The instructions all called for them to run 30W oil. This was back in the 60-70's) I know there are reasons for using 2 stroke oil, but in a pinch I'd bet that 30W in the same ratio would work ok.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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