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Mariner Outboard

1981 according to Yamaha but 1980 is close enough.

Presumption being there is 677 and either an S or an L in front of the numbers.
 
In that case it is a 1988 model year motor.

Best bet for parts is to look at a Yamaha parts catalog for a model 8SG.
 
In that case it is a 1988 model year motor.

Best bet for parts is to look at a Yamaha parts catalog for a model 8SG.
I should have stated a Yamaha USA parts catalog for a model 8SG. If you are not in the USA it may go by a different model identity.
 
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