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1989 20 HP Johnson power upgraded to 25 HP for zero dollars
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<blockquote data-quote="Siguz" data-source="post: 345229" data-attributes="member: 13594"><p>https://drive.google.com/folderview?id=0Bx_nvDyN8sqscXotWW5ETGdvX0k&usp=sharing</p><p></p><p>The link above is to the pictures of my 20->25 mod.</p><p>The pics are numbered in sequence.</p><p></p><p>You'll notice that I didn't smooth out the opening of the manifold. I didn't because the carb covers all of the rough edges therefore not creating any kind of further turbulence and I wanted to be sure that I had enough material get a proper gasket seal. Also, the marks on the front of the manifold are from my dremel slipping (oops); they are superficial and did not affect the integrity of the surface.</p><p></p><p>Big thanks to Stefan! Thanks for the idea and thanks for the guidance.</p><p></p><p>Note: Aluminum melts when a high speed too is used. The best way to do this mod is with a drill press at low speed. I cut is better than many <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>Can't wait to get it out on the water</p></blockquote><p></p>
[QUOTE="Siguz, post: 345229, member: 13594"] https://drive.google.com/folderview?id=0Bx_nvDyN8sqscXotWW5ETGdvX0k&usp=sharing The link above is to the pictures of my 20->25 mod. The pics are numbered in sequence. You'll notice that I didn't smooth out the opening of the manifold. I didn't because the carb covers all of the rough edges therefore not creating any kind of further turbulence and I wanted to be sure that I had enough material get a proper gasket seal. Also, the marks on the front of the manifold are from my dremel slipping (oops); they are superficial and did not affect the integrity of the surface. Big thanks to Stefan! Thanks for the idea and thanks for the guidance. Note: Aluminum melts when a high speed too is used. The best way to do this mod is with a drill press at low speed. I cut is better than many :) Can't wait to get it out on the water [/QUOTE]
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1989 20 HP Johnson power upgraded to 25 HP for zero dollars
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