What is the proper oil mixture for a 35 hp Johnson outboard?

Its a complex question as you do not state what octane fuel you are using, but do not use a 40:1 or 50:1 ratio as the engine bearings tend to wear out due to lack of lubrication. A 32:1 ratio is ok but you can up it to 24:1 mixture maximum, if there is excessive smoke then move downwards in ratiOS to 32:1