50:1 is the correct mixture for a 1992 Johnson 60 hp outboard.
50:1
The 1992 model, 28hp Johnson outboard performs well on a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
1992
135kg
About 355lbs
1992
A Johnson outboard, model number J20CREND, would be a 1992 model, 20 hp.
1992
The dry weight of a 1992 40hp Johnson is between 180 and 190lbs. depending on the model.
The correct mixture is 50:1 for run in motors. I would be suprised if your engine isn't run in unless its been rebuilt.
i have a 15hp johnson with that same model number and it is a 1992
396 pounds