I have a 1969 Evinrude 20 hp lower unit. Will it work on a 1966 Evinrude 18 hp motor. I can't find a site that will tell me if they will interchange. Thanks
There was no 20hp Evinrude in 1969. They offered 18 and 25hp. Johnson had 20 and 25hp. No matter, they all have the same lower unit and I can't think of any reason they shouldn't fit a 1966.
There is the BRP site with parts catalogs on line for 1968 and up. Unfortunatly, that doesn't help with the 1966. There are/were interchange guides available to dealers which show up on e-bay from time to time.
My reply was mostly from head knowledge acquired as a full time outboard dealer mechanic during those years. Plus I have a bunch of old books where I could look it up if I doubted my reply.