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40 hp mariner

You are missing some of your serial number.

It should start 6E9 or 676 - (then the numbers you posted).

It will be a Yamaha built (for Merc) model - the first 3 characters will tell whether it's an A, B or C model and determine if parts are available....
 
That is a 1986 "C" model Mariner.

Merc dealers still stock most of the parts you would need for routine maint.

They are also one of the only sources for parts, although Yamaha may still stock the odd item for their models 40FE or 40FM which was their own version of your motor...
 
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