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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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<blockquote data-quote="Sportsman570" data-source="post: 358217" data-attributes="member: 14656"><p>I have found this tread to be very informative and thank Johny25 for posting in such detail. My situation is slightly different from most as I'm looking to mod a 1988 Mil. surplus, Johnson 25Hp(AEM25B). It has the same 31.8 Cubic inch power head as ones already discussed. The intake manifold is PN 396788 with the Carb assembly being PN 432168.</p><p></p><p> As several of you have already done, I'd like to squeeze more out of the outboard and believe that I have understanding of what's required. My intention is to replace existing carburetor with a new or rebuilt Carb. assembly PN 0432021, and to replace the existing intake manifold with PN-0396790. Does this sound correct?</p><p></p><p>Also, I'm a little confused when it comes to the intake manifolds and their part numbers. I'm having a little trouble locating a used 0396790 intake but have found a used 0391054 for sale. From what I understand the 790 replaced the 054 model. Other than the part numbers are these intakes identical in every way? </p><p></p><p>Should I pass and keep looking for used 0396790 or quit being so **** cheap and buy new? I wouldn't think a new manifold would perform and better than a used one that was in good condition but I could be wrong.</p></blockquote><p></p>
[QUOTE="Sportsman570, post: 358217, member: 14656"] I have found this tread to be very informative and thank Johny25 for posting in such detail. My situation is slightly different from most as I'm looking to mod a 1988 Mil. surplus, Johnson 25Hp(AEM25B). It has the same 31.8 Cubic inch power head as ones already discussed. The intake manifold is PN 396788 with the Carb assembly being PN 432168. As several of you have already done, I'd like to squeeze more out of the outboard and believe that I have understanding of what's required. My intention is to replace existing carburetor with a new or rebuilt Carb. assembly PN 0432021, and to replace the existing intake manifold with PN-0396790. Does this sound correct? Also, I'm a little confused when it comes to the intake manifolds and their part numbers. I'm having a little trouble locating a used 0396790 intake but have found a used 0391054 for sale. From what I understand the 790 replaced the 054 model. Other than the part numbers are these intakes identical in every way? Should I pass and keep looking for used 0396790 or quit being so **** cheap and buy new? I wouldn't think a new manifold would perform and better than a used one that was in good condition but I could be wrong. [/QUOTE]
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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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