My motor says 100 to 1 right next to the fuel connection....
I have a 1988 25 hp LS Evinrude pull start and I weighed it at 123 lbs.Retired auto tech
The 25 hp Evinrude outboard has been designed to run a 50:1 ratio, for earlier models, and 100:1 for late model engines. Pre 1965 models run a 24:1 ratio.
The late model 25 Evinrude suggests operating on a 100:1 ratio. I prefer the old time tested 50:1 ratio, one pint of two cycle oil, to six gallons of fuel. I have never seen an outboard powerhead failure, due to running a 50:1 mix.
.G Argo Boat Company http://www.argoboat-ny.com
The 1979 model, 25 hp Evinrude requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
50 to 1
For the 1990 model, 25 hp Evinrude outboard, use a 50:1 ratio, roughly 1 pint of 2 cycle oil, to six gallons of fuel.
An Evinrude 25hp outboard, 1985 year model, requires a 50:1 fuel, to 2 cycle oil ratio. This is roughly one pint of 2 cycle oil, to six gallons of fuel.
A 25 hp Evinrude, model number E25RCNB, would be a 1982 year model.
25
Look up and see answer entered for "25 hp Evinrude". It is the same.
The correct spark plug gap for the 1994 model, 25 hp Evinrude outboard is .030 in.