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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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<blockquote data-quote="Edstrossner" data-source="post: 373973" data-attributes="member: 15774"><p>Omc lowered the minimum octane required for all the 2 cylinder cross flow motors down to 67.</p><p>They where selling a lot of these motors to areas of the world that had poor gas. </p><p>They may have opened up the ports to keep the hp rating the same.</p><p>I have seen pics of the high compression 25/35hp head on boatracingfacts web site. They say that it is from a 1982 model year.</p></blockquote><p></p>
[QUOTE="Edstrossner, post: 373973, member: 15774"] Omc lowered the minimum octane required for all the 2 cylinder cross flow motors down to 67. They where selling a lot of these motors to areas of the world that had poor gas. They may have opened up the ports to keep the hp rating the same. I have seen pics of the high compression 25/35hp head on boatracingfacts web site. They say that it is from a 1982 model year. [/QUOTE]
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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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