go to www.johnson.com and it will guide you from there or you could go the easy route and go to your local johnson/evenrude dealer and they can tell you all you need to know from the serial #
565656556
can i get a generater for a johnson RDS-28B...serial no..C476429
Mfg 1967
Built in 1982 according to several website. My sea-horse serial number is only about 100 serial numbers from yours... in the same batch.
You have given the serial number, which is no help. We need the model number - look on the plate again. All Johnson 3 horse outboards had a model number beginning with either JW or JH.
1977 6 (horse)
The year is estimated at around 1946 to 1950, but is pinpointed at 1947
40:1
25hp
Your 1958 Johnson uses a 24 to 1 mixture.
I appears that the 2 is the horse power, R may be the direction of rotation and 74 refers to the year. All the motors of that year1974 have the 74 in the model number
Sea horse 4 hp, the 74 states it's a 1974 model. Similar parts reference can be found at boats.net, they list a 4r74r,