It take very little power to push a 17' boat. The 2.5 will be fine for going from A to B.
It will also be fine on calm days, and moderate ripple to wave.
BUT when there is a wind exceeding about beaufort force 4 ( = fresh breeze) your speed will decrease going into the wind noticeably, while still being acceptable.
The same breeze from the side will push you off course, causing a need to head partially into the wind, as well as in your desired direction of A to B.
Now your speed to a chosen destination is halved or worse.
So you lose steering in cross winds, and a Bft wind force 5 is probably not do-able with a 2.5hp outboard, a day where a 6 or 8 would be more appropriate for the same 17' boat.
Really, it depends on what conditions you like to fish in.
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