The year model of an Evinrude outboard engine is determined from the engine "model number", rather than the serial number.
The year model of an Evinrude outboard cannot be determined from the serial number, but rather from the model number.
An 85hp Mercury outboard, serial number 3867469, is a 1974 year model.
1975-76.
On the 1976 model, 85 hp Evinrude, the overheat circuit is the only alarm system on the engine. Check the temperature on each head, due to independent thermostats, for an overheat condition.
The oil / fuel ratio for the 1977 model, 85 hp Evinrude outboard, is 50:1, roughly one pint of 2 cycle oil, to six gallons of fuel.
the age is 1983 mercury buddy.
have a look here http://www.eastcoastmarineservice.com/models.html
The dry weight of an 85hp Yamaha outboard is 245lbs.
60kph
50:1 ratio 16 oz 2 stroke marine motor oil to every 6 gallons of gasoline this is most common I use this mix ratio in my 80 hp mercury spitfire
you have to make ngk b8hs-10
50:1 16oz per 6gal tank