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Old 10 March 2011, 08:49   #1
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Mariner 40 Stroke Fuel Ratio

I have 2 Mariner 40ML engines. Manual Start. 1989 and 1987. Pre-mix not autolube.

6E9 L 310314 and 6E9 316764

I believe they are Yamaha built and they are identical to a Yamaha 40 I had.

The Yamaha was 100:1 ratio fuel to oil. Stamped on engine

I assumed the Mariners would be the same

A few people have suggested it should be 50:1

Any thoughts would be appreciated!

Thanks
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Old 10 March 2011, 09:57   #2
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i would advice a mixture of 50:1 ignore the 100:1 decal, as its an old obm the extra oil will not do it any harm
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Old 10 March 2011, 10:17   #3
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I had a 40 mariner at the same time as my mate had a 40 yammie. Same engines different colours both engines equipped with electric and recoil start which was always a handy safety feature beach launching thru surf. His was 100:1 mine at 50:1 . We ran them both at the same sorta skinny 50:1. If 100:1 is good 50:1 must be better sorta attitude. Had that engine for 17 years-never missed a beat and it had an awful lot of use, we live just back from the beach and those were the days of Jumbo cod around here, the boat was always out in winter if the weather was anything like good enough-oh happy days, we thought they'd never end......they did with the help of the european fisheries policy
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