i run mine @ 50:1
50:1 oil mix is typical for outboard two-cycles. Some do a little more in the winter.
The dry weight of the 1991 model, Johnson 150hp outboard is 384 lbs.
About 355lbs
The 1996 model, 150 hp Johnson outboard, has a dry weight of 375 lbs.
.03
A non-oil injected, 150 hp Johnson outboard, of the 2 stroke family would require a 50:1 ratio. This is roughly one pint of 2 cycle oil, to six gallons of fuel.
It is the highest cylinder. (Starboard top cylinder)
The 150 hp Force outboard requires a 50:1 fuel to oil ratio.
50:1
They are OK engines. I would say that Yamaha engines are the best though.
The fuel mix ratio for a Johnson 150 hp outboard motor typically requires a mixture of 50:1, which means 50 parts gasoline to 1 part 2-stroke oil. This translates to about 2.6 ounces of oil per gallon of gasoline. However, it's always best to consult the owner's manual or manufacturer recommendations for the specific model to ensure proper mixing ratios.
The last year that Force offered the 125 model, 1989, the dry weight was 300 lbs. The 150 Johnson, 1989 year model, dry weight from 380 to 393 lbs, depending on model.