No it's not adequate... it's more than adequate!
Our 225 tops out at 45 mph on the gps in fresh water. Granted it's a 2 stroke based off a 250 powerhead = way more torque than most 225 4-strokes.
That said any 2 or 4-stroke 300 will smoke what we are running.
Btw, in case you didn't know the Journey and Voyagers are very similar.