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1989 20 HP Johnson power upgraded to 25 HP for zero dollars
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<blockquote data-quote="Johny25" data-source="post: 327794" data-attributes="member: 7791"><p>Well in 1985 the 20 and 25 had the exact same carb and part number 0395279 and the 20 and 25hp carried exact carb numbers up to 1988 at least. And I believe it continued after that it just becomes harder to trace the numbers.</p><p></p><p> All motor manufacturers use a single block casting to produce a couple or several different horse power ratings. This is for many reasons including cost and profit to the manufacturer, more HP options for consumer to get largest HP motor for their boat without going over CG transom tag regulations, and also fuel economy. It is the same with the 9.9hp that was made for so many years, all it was really is a de-tuned 15hp. And believe me there is a pretty noticeable increase in hours per gallon that your motor will burn by making HP modifications. I have done the 9.9 to 15hp conversion and the 25 to 30hp conversion and very easily could tell I was eating more fuel. But that is the price you pay for more ponies <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> Believe it or not some people don't care how fast their boat goes, just that it gets on plane and the fuel economy is good #-o and then there is the rest of us that think everything should and could go a little faster :mrgreen:</p></blockquote><p></p>
[QUOTE="Johny25, post: 327794, member: 7791"] Well in 1985 the 20 and 25 had the exact same carb and part number 0395279 and the 20 and 25hp carried exact carb numbers up to 1988 at least. And I believe it continued after that it just becomes harder to trace the numbers. All motor manufacturers use a single block casting to produce a couple or several different horse power ratings. This is for many reasons including cost and profit to the manufacturer, more HP options for consumer to get largest HP motor for their boat without going over CG transom tag regulations, and also fuel economy. It is the same with the 9.9hp that was made for so many years, all it was really is a de-tuned 15hp. And believe me there is a pretty noticeable increase in hours per gallon that your motor will burn by making HP modifications. I have done the 9.9 to 15hp conversion and the 25 to 30hp conversion and very easily could tell I was eating more fuel. But that is the price you pay for more ponies :) Believe it or not some people don't care how fast their boat goes, just that it gets on plane and the fuel economy is good #-o and then there is the rest of us that think everything should and could go a little faster :mrgreen: [/QUOTE]
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1989 20 HP Johnson power upgraded to 25 HP for zero dollars
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