40:1
Your 1958 Johnson uses a 24 to 1 mixture.
1961
b 08800420
i have a johnson seahorse outboard 20 hp motor model 20 ba serial number 26711 would like to know the year it is.
1946
It is a 1957
I found mine on the upper part of the shaft, on the left side.
24:1 Manufacturers recommendation. You can go up to 32:1 with the newer oils available. The FD-12 is a 1958.
Find Owner And check for lien on motor.
The 77 in the model number 10R77A means it was manufactured in 1977.
It is a 55 horse, Electric start, Long shaft, 1977, production D motor
Built in 1982 according to several website. My sea-horse serial number is only about 100 serial numbers from yours... in the same batch.