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The initial setting for the mixture screws is 1 1/2 turns out. Connect a vacuum gauge and turn them until you get the highest reading and make sure they are both set the same. This will give you the best fuel economy.
The correct fuel mixture for a 1979 85 hp Johnson outboard motor is 50:1
my 1979 35hp Johnson is 50/1
I use a 50:1 mixture in my 9.9 Johnson
one carburetter they usually have two adjusting screws one for throttle the other would be setting the right fuel mixture
If the car is carbureted then there are two little screws on the carburetor called air/fuel mixture screws that control the air/fuel mixture. There should be info. on your cars factory settings. Hope this helps.
50:1 25litres of fuel to 500ml of oil
50:1
50:1
50 to 1
50:1
50:1