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.
To determine the age of your 25hp Evinrude outboard motor with the model number 25002EC-72295, you can refer to the first two digits of the serial number. In this case, the "02" typically indicates it was manufactured in 2002. Therefore, as of 2023, the motor would be approximately 21 years old.
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
freeze plug on top of engine.
25hp
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.