1993 Yamaha 9.9 horse 2 stroke increase power to 15 horse?

Question:
I have a Lund 16' aluminum boat with this 9.9 on it. Most of the lakes I fish are 9.9 or lower lakes. I have heard you can increase the power by installing a 15 horse carb. Can anyone help me with this?

Answers:

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The simplest answer is contact a Yamaha dealer and check if the bore and stroke are the same on both the 9.9 and15 hp motors if so you might just be able to change the carb and get the power. this was a quite common practice among the Johnson/evenrude mercury/mariner motors they did this just to meet the 9.9 lake regulation but believe it or not the 15 hp carb supplied more air and less GAS! a leaner mixture translates into more HP

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take more than a carb

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yep, it'll take more than a carb. think about increasing the hp of an engine by 50%. why not get a 15hp and put a 9.9hp cowling on it?

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In most all engine brands, close-horsepowered engines are the same block but may have different heads and carbs.

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Look up NADA, go into Boats, then Outboard Motors. Take a look at a brand and then look at a 90 and a 115... the weights are often only 2 or 3lbs off. Or a 150 and a 175... same block, different heads. Only a few pounds of weight difference.

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9.9s and 15s are usually the same. 20s and 25s are usually the same.

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Hey, i'm with other dude. Just get yourself a new set of decals!

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the guy ( i forgot his name ), who said they add more air than fuel is correct about that, however i do nto think that just a carb woudl make that big of a difference, thats 50%, think of changing the carb on a100 hp engine and make it 150 hp, not going to happen...you can port the exhaust and/ or oversize the pistions..i woudl go with the sticker idea unless someoene will check, throw on a larger powerhead, if your going through all this trouble bump it up to 20 hp minimum

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yes just the 15hp carb will do it!
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