you can try 25-1, if it's too smokey, work your way up to 50-1
50:1 /16Oz.per 6 Gals. gas. I have the same outboard.
An 85hp Mercury outboard, serial number 3867469, is a 1974 year model.
50:1
1975-76.
An 85 hp Mercury outboard, serial number 3876355, would be a 1974 year model.
the age is 1983 mercury buddy.
The dry weight of an 85hp Yamaha outboard is 245lbs.
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
have a look here http://www.eastcoastmarineservice.com/models.html
We are looking to put a newer mercury on the boat, hoping that it weighs less or the same as the one we got. michaele.trotter@gmail.com
60kph
The correct ratio for 1991 85hp Yamaha is 1:50. 1 liter of oil for 50 liters of fuel.