Yours is a 1969 Eska built 5hp. Motor.
the fuel/oil ratio then was 16:1 but you could probably get away with 32:1

I forgot to mention that the Tecumseh powerhead is air cooled, but the exhaust column is water cooled by an impeller. Do not run it out of water. Impellers can be purchased on ebay and i believe there are regular ones and tall ones depending on the model. You will have to compare yours to the ebay pictures.

The 217 part of model number is a Sears Source Code that identifies maker Eska.
Sears retailed products made by a variety of manufacturers and identified maker
by first three digits of model number. Source Code list available on internet
may be helpful or not as Sears products were sometimes unique or modified versions of makers own brand.
Louis

Here is the Ebay page that you can find parts. Be careful to follow model numbers and hp. Some parts cross over to other models but nothing is guaranteed.

eskaman2008 is the most knowledgeable person I know of when it comes to the Eska made sears motors. Ask him if you have specific questions about parts.

Here is the Sears parts direct pages for your motor. It has sears part numbers and an exploded diagram of each section. Some parts are still available there.