Around 150 to 200
50:1
The dry weight of a 1985 model, 25hp Mercury outboard is 105 lbs.
Model number E25TELCSA, is a tiller electric start, 20" shaft, 1980 year model, 25hp Evinrude outboard.
120
I use the QL77JC4 Champion plugs with a 0.030in gap.
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 25hp Evinrude, 1972 year model, requires a 50:1 fuel, to 2 cycle oil, ratio. One pint of 2 cycle oil, to six gallons of fuel, is just a bit richer than 50:1, and a good mix.
24:1
25hp
freeze plug on top of engine.
If it is a 2 cycle where you mix the oil with the gasoline then use 2 cycle marine oil. If it is a 4 cycle then use the weight recommended by Evinrude.
The label on my 1999 Mercury 25hp outboard says the dry weight is 114 lbs. Doug, So. California