I have a 1962 Evinrude Lark IV (40 h.p.)Selectric shift pushing a 26 ft work barge with a 3 blade prop.I should mention that there is no size marking on the prop other than an "S" stamped on the hub.The motor runs at about 2000 rpm and goes through the gas at a pretty good rate.Average load on the barge runs from 2000 to 2400 lbs per load.I'm hoping someone has some suggestions.Thanks much
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