Model nr question-64 Evinrude

[S_Laker]

I'm in the process of freshening up a 1964 40 hp Evinrude, the model nr is 40453S. I was wondering what the "S" denotes, I can't find a reference to it anywhere. It has the water heated choke, what are your thoughts on this setup. I have another carb with the electric choke assembly I've been thinking of using. I want to go through the carb I use, want to be sure to get the proper kit.

 

[F_R]

Re: Model nr question-64 Evinrude

The "S" is there to confuse and worry you. Seriously, it denotes any mid-year engineering changes---IF---there were any changes. Only matters if you are ordering the parts affected by the change. The parts book will tell.

I'd have to check, but I'm thinking the '64 is supposed to have a hot-air choke, not a hot-water choke. The hot-air ones worked pretty well, but the first year had a wierd override switch. Most people swapped that out for a conventional choke switch.

EDIT: Ok, I checked, and the 1964 indeed came with a hot-air choke with override switch. While I was at it, I also noted there was a "R" suffix, as well as the "S" suffix. The changes were in the throttle cam, carburetor body,carburetor main nozzle, and orifice plug. As I said, the parts book tells the tale.