Some of the older boats I have seem for sale on Craigslist have newer outboards on them.
Four stroke motors, especially the first generation, are heavier than the two stroke models that were originally installed.
Choosing to install the same horse power means more weight.
Right or wrong, there is a perception that a replacement 75hp four stroke motor does not provide the same power as the 75hp two stroke motor it replaces.
Some owners have chosen to install a motor with more hp to try to keep the performance the same.
That can add even more weight.
This can lead to trouble!
1) More weight on the transom can cause handling and self bailing issues.
2) An older boat may have compromised wood in the transom leading to flexing and or failure.
Most motor mfg's use a common chassis for a series of motors with different hp ratings.
For example, a 90hp and a 115hp may share the same chassis and therefore almost the same weight.
It is wise to learn where the target hp fits in to this scheme.
Do you want a "light" 115hp or the "heavy" 90hp?
There is also the pesky detail of the USCG limitations placcard.
Boats that are designed from the start to accommodate the heavier four stroke motor should not have these issues.
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