Is my outboard 50-1 or 100-1 mix ?

[richardhart90]

I have a Mariner 4hp 2 stoke outboard and wondered if any one could tell me the correct fuel mix
i have been using 100-1, but some people say use 50-1 !
I was told 50-1 at sea, and 100-1 on rivers !

Believe its 1984...

Serial no
4A M GE0 S 052076


Cheers
Rich

 

[Even Chance]

I have a Mariner 4hp 2 stoke outboard and wondered if any one could tell me the correct fuel mix
i have been using 100-1, but some people say use 50-1 !
I was told 50-1 at sea, and 100-1 on rivers !

Believe its 1984...

Serial no
4A M GE0 S 052076


Cheers
Rich

I had one similar, but 5hp, and always ran it on 100-1. No problems, and the guy that bought it is still using it daily.

 

[Even Chance]

Im using a more modern, but essentially the same engine Yamaha 6EO 4hp at the moment. It says to run it on 100-1 too.

 

[ditchcrawler]

With my small Tohatsu the running in period was 50/1 and 100/1 thereafter.I can't remember the running in time period but quite small.

 

[l'escargot]

With my small Tohatsu the running in period was 50/1 and 100/1 thereafter.I can't remember the running in time period but quite small.

The current Tohatsu 3.5 manual says running in at 25:1 for 5 hours with gradually increasing revs., then 50:1 for normal running.

http://www.tohatsu.com/tech_info/own_man_pdfs/Toh2-5A2_3-5A2_3-5B2.pdf

Mid 80's I would have thought most 2 strokes were running on 50:1.

 

[noelex]

My impression talking to experienced outboard mechanics is that it is generally better in terms of engine health to run outboards rated at 100:1 at a richer oil mixture. Most seem convinced 50:1 is the best option, unless the operating conditions are unusual.

If you do run at 100:1 make sure it's the higest spec outboard oil and a reasonably fresh mix.

 

[Snoopy463]

Mariner 4HP bought in 1994 was 50:1. Bought another (Saildrive) in 1997 which was 100:1.

 

[Lakesailor]

Quite a few manufacturers sold the same motor for leisure and commercial use.
They rated the leisure ones at 100:1 but the commercial versions at 50:1

I certainly wouldn't run at 100:1. Some sources suggest a halfway house 75:1.

 

[VicS]

If in doubt use 50:1 . Its the safe mix for most engines of this age.

You might get away with 100:1 for light use but if you do be sure to fog it when laying up

I think you are right about the year but the serial number is 6E0 not GE0

You should be able to find an owners manual in the Brunswick Marine Download center http://download.brunswick-marine.com/download/main;jsessionid=105vjo07c1lcd?type=corp although its not always easy to find the right one

 

[Poignard]

My outboard motor handbook said to run in with 50:1 and then to use 100:1.

But my portable generator requires 50:1 so, rather than have two petrol cans, I just use 50:1 for both engines.

The outboard doesn't seem to mind. It always starts easily and doesn't produce any noticeable smoke.

 

[richardhart90]

ok thanks guys, great help

 

[sailorman]

the 100>1 was a sales pitch
use 50>1 for longevity

 

[John100156]

My 25hp Mariner manual states 50:1, it's ten years old and starts and runs just great. Better than my last 4T Honda motor.....

 

[ex-Gladys]

Pre 1990 Mariner 2 strokes are 50:1... According to my manual