My brother has that model. He’s replaced the fuel connectors with OMC — easier and cheaper to get. 50:1 works fine. West Bend designed simple, utilitarian motors — not all had really fine tolerances, some with oversize bearings — they can tolerate a variety of fuel mixtures (nothing rarer than 50:1).
Warning: I have several Chrysler/West Bend/Sea King of that era. At least 3 have no lower unit. If you shift rapidly from Forward directly to Reverse or from neutral at high (~1000+) RPM, you will destroy the lower unit.The inertia of the gears and propshaft slamming against the rear propshaft carrier cracks the support structure around that carrier. Affected are those with carriers held in with a snap ring/circlip. Those with the 2 screws to attach the carrier to the gearcase are not.
