Hi,
I can’t answer your specific questions but I remember seeing a lot of reference for Eska here:
Discount Marine Parts in Wisconsin sells carb kits and impellers for it:
http://www.discount-marine-parts.com/ob_eska_sears.html
The Sears site still has parts diagrams for it:
https://www.searspartsdirect.com/model/34c9tvbpr7-000247/craftsman-217585880-boating-parts
