Mercury Mariner 2 stroke- fuel mix ??

Owner's Manual

You should be able to download that info plus lots more in the owners maunual which are normally available to download if you know engine year and horse power. I have a 1997 15 hp which uses 50:1 which I understand is pretty standard.
 
What HP ?

The Serial number will I think make it a Belgium made 1989 model if its a small one . Maybe 1988 if it's 20 hp or more

You should be able to locate an owners manual in the "Download Center " at http://www.brunswickmarineemea.com/download/main?type=corp.

50:1 will be safe and sensible fuel mix. Even if it turns out that the manual says 100:1 I would run it on 50:1.

Some good advice to the new owner of an old outboard can be found at http://forums.iboats.com/showthread.php?t=158086

Parts lists and diagrams if required at http://www.boats.net/

Dont use it without checking the cooling and preferably replacing the pump impeller unless you know its fairly new.
 
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Why do people keep asking this question?
If you run it on 50:1 and it smokes a lot try 60:1, then 70:1 until it stops smoking.

There aren't just two ratios.
 
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