Re: 1984 35hp johnson mix ratio
the ratio, is 50 parts gas, 1 part TC-W3 outboard motor oil. this is the easy way to figure it out.
http://www.iboats.com/2_Cycle_Oil_M...73703934--**********.842593872--view_id.56142
that motor should burn about 3-3.5 gallon of fuel per hour and wide open throttle, so 12 gallons will last a good while. i would also add stabil to the mixture, to help keep the gas from getting old.
also change all your fuel line to alcohol resistant lines, if it has not been done. they will say alcohol resistant on them. Ethanol, deteriorates the old line and clogs the carborators.