What is the oil mix ratio for a 1973 johnson 40hp?

The oil mix ratio for a 1973 Johnson 40hp outboard motor is typically 50:1, which means 50 parts gasoline to 1 part oil. This translates to about 2.6 ounces of oil per gallon of gasoline. Always check the owner’s manual for any specific recommendations or variations that may apply to your specific engine.