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Gas/Oil Leak?
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<blockquote data-quote="Pappy" data-source="post: 280319" data-attributes="member: 3278"><p>That's an excellent way to completely ruin a '50s Johnson or Evinrude! These engines were designed to run on a 24:1 mixture, even with today's oils. There is no carbureted OMC engine that should be run on 100:1 at all. The ones that were originally designated for this mixture were changed back to a 50:1 mixture via dealer and customer mailings plus a service bulletin.</p><p>To answer the original question - starting in 1964 the mixture was changed from 24:1 to 50:1 on OMC product.</p></blockquote><p></p>
[QUOTE="Pappy, post: 280319, member: 3278"] That's an excellent way to completely ruin a '50s Johnson or Evinrude! These engines were designed to run on a 24:1 mixture, even with today's oils. There is no carbureted OMC engine that should be run on 100:1 at all. The ones that were originally designated for this mixture were changed back to a 50:1 mixture via dealer and customer mailings plus a service bulletin. To answer the original question - starting in 1964 the mixture was changed from 24:1 to 50:1 on OMC product. [/QUOTE]
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