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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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<blockquote data-quote="RStewart" data-source="post: 337124" data-attributes="member: 278"><p>Thanks for all this info. It will be very helpful. I can't figure something out though. I have a 1999 9.9 Johnson. I was trying to see if I could increase it to a 15 hp motor. My model # is J10REER & I crossed it with a J15REEA, closest model number to mine. I checked carb, intake, crankcase, reed plate, exhaust, pistons, & gear case & both engines have the same part numbers. How does the 15 make more power? What can I do to get more power from the 9.9? It is on a 1968 Rich line 14 ft aluminum semi v & it will not plane out. I do know one of my issues is I have a long shaft motor on a short transom. I would love to get a 25 hp motor & do this mod to it, but for now I'm stuck with the 9.9.</p></blockquote><p></p>
[QUOTE="RStewart, post: 337124, member: 278"] Thanks for all this info. It will be very helpful. I can't figure something out though. I have a 1999 9.9 Johnson. I was trying to see if I could increase it to a 15 hp motor. My model # is J10REER & I crossed it with a J15REEA, closest model number to mine. I checked carb, intake, crankcase, reed plate, exhaust, pistons, & gear case & both engines have the same part numbers. How does the 15 make more power? What can I do to get more power from the 9.9? It is on a 1968 Rich line 14 ft aluminum semi v & it will not plane out. I do know one of my issues is I have a long shaft motor on a short transom. I would love to get a 25 hp motor & do this mod to it, but for now I'm stuck with the 9.9. [/QUOTE]
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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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