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I'm looking to buy a early 1990's 25 outrage. It has twin 150's that needs replacing. I read that for twins, it would need 20 inch shafts. Can anyone verify? What would happen if I repowered with 25 in shafts?

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Not sure whether 20 or 25 would be better, but if the performance is good with what's on it now, then I would stick with whatever that length is. I thought that shaft length was governed mainly by transom height.

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If it does NOT have the Whaler Drive, then twin motors would use the 20 inch shaft.

If you intend to put on 25 inch shafts, then you would need 2 engine brackets to raise the motors 5 inches each....
Many people do use the 25 inch shafts and engine brackets because you can buy the 25 inch shaft motors in counter rotating... You can no longer buy the 20 inch shaft motors with counter rotation.

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Joe,
Ok, so if you have a Whaler Drive then you use 25" shaft with a single and / or twins ? I also assume if you have a Whaler Drive, it the same no matter what the boat length ?

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Joe, thanks for the info. I'm looking to repower with twin 150 4-strokes with one counter rotating.

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kenny,
Glad to help...

GTL,
If I remember correctly, some early model Whaler Drives used different shaft lengths...
The newer Whaler Drive models used 25 inch shafts in both the single engine or twin engine configuration.

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With a Whaler Drive you use twin 25" shaft motors (raised on their mountings). You also use a 25" single set low. You can get away with this because the Whaler Drive itself has a flat spot at the bottom to allow water to rise up a bit. Even with that some owners have found a 25" shaft motor to be problematic with some propellers.

The very first Whaler Drives did not have this flat spot and thus could not accommodate a single motor, at all.