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Year and prop helpI just

wadegreenquist

New member
I just got a mariner 40 hp ( 40 el 6e9 L 416677 ) came with no paperwork and I'm guessing its a 1985 ( that's what year the boat is ) its on a 15 ft Lakeland fiberglass boat and would like some help figuring out what size prop I should put on it. The old prop does not have any identifying marks on it. Thanks for your help.
 
Thats 11 inch pitch you size the pitch using WOT rpm. It is safe to replace like to like but it depends on how you use your boat. Is the hull clean andtrim angle optimal? How mich weight is in the boat and how its distributed? WOT should be between 5000 and 5500 rpm. Less pitch higher rpm.
 
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