Re: old johnson seahorse
Fuel/oil mixtures depend on the bearing setup of many engines. OMC once came out with a bulletin that stated that all of their engines, past, present, and future models, could run on the 50/1 mixture, excepting the 1957 7.5hp model.<br /><br />Unfortunately I cannot locate that bulletin, but should I come across it someday, I'll post it.<br /><br />A rule of thumb that is taken by many as gospel is that any engine that consists of all roller and/or needle bearings can use the 50/1 mixture, and that any engine that has what is normally refered to as a babbit (bronze etc) bearing incorporated within its structure would use the older mixtures.<br /><br />Bottom line is to play it safe, oil doesn't cost that much as compared to the engine.
