I have the original gas tank for the same engine and it says 5 ounces per 5 gallons..
it is prefferable to use 10/30 oil mixture because it doesn't harm the motor and the mixture's density is proper
A 35hp Mercury outboard, serial number A184641, 1985 year model.
A 35 hp Mercury 2 stroke, requires a 50:1 ratio, one pint of 2 cycle oil to six gallons of fuel.
my 1979 35hp Johnson is 50/1
The 35 hp Mercury outboard has a dry weight of 148-150 lbs., depending on year model.
A 35hp Mercury outboard, serial number 6445947, would be a 1984 model.
The Mercury 35hp outboard with the serial number C201910 was manufactured in 1988. Mercury outboards typically use a coding system that includes the year in the serial number, and the 'C' prefix indicates that it was produced in that specific year. For precise identification, consulting Mercury's official documentation or contacting a dealer can provide additional confirmation.
The FD 16 A is a 1962 model 18 Hp motor.
A 35 hp Mercury outboard, serial number A152966, would be a 1985 year model.
The water pump is inbetween the lower unit and the motor . Remove the lower unit with 6 bolts and u will see it.
1959 thru 1963 Johnson and Evinrude use a 24 to 1 ratio. 1964 and up is 50 to 1
http://www.brunswickmarineemea.com/download Click on "Operation and Maintenance Manual", then just drill down to your year and model.