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Hi Joe, Jason here again.
The outboard was made by a company called Eska and they made it for Sears. Tecumseh is the name of the actual engine block. How it works is Eska purchased engines from Tecumseh, and Eska manufactured the rest of the outboard using a Tecumseh engine block, and then sold them to Sears. You can use regular 87 octane in the engine. The fuel oil mixture is 24 to 1. That works out to be a tad over 5 ounces of 2 stroke outboard oil for every gallon of gas. On cleaning the tank, if you don't see any rust in it, attempting to clean it might to more harm than good. If there is rust in it, that rust can be cleaned with oxyalic acid and water. After it is cleaned you can seal it with epoxy. Click this link, you would need an epoxy designed specifically for fuel tanks. http://www.caswellplating.com/epoxy-gas-tank-sealer/caswell-epoxy-gas-tank-sealer-motorcycle-kit-up-to-10-gal-cans.html
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Thanks for understanding.