Home › Forum › Ask A Member › Odd grey discharge from lower part of 1962 Johnson 10hp Seahorse › Re: Odd grey discharge from lower part of 1962 Johnson 10hp Seahorse
emulsified oil/water mix? Try it out as mayonnaise.
Seriously, debates about acceptable fuel mixes for old outboards go on forever–they simply have no endpoint. Even OMC itself screwed up repeatedly on this subject. Many people would feel that a powerhead with all rolling element bearings should be able to run at 50-1, but there may be other considerations such as the surface finish of the pistons, management of liquids in the crankcase, etc.
I have a 1965 5.5 and run it at 24-1 because it (probably) has plain bearings (bushings) on the wrist pins and the center main is also a plain bearing. If the parts listings on Marinengine.com are correct it looks like your 1962 10 hp has needle bearings on the wrist pins but plain big-end bearings as well as the center bearing. If that is the case I would run it at 24-1 also. This was a transitional period for OMC and they did advise 50-1 for some plain bearing engines such as the 3-4 hp. But this engine is very small and probably has very low bearing pressures. All in all, not a simple subject.