I am on my second Yamaha 15Hp 4 stroke in two years, first one got stolen. I have little experience with larger 4 strokes. I do have some experience with larger 2 strokes from riding in other boats.

4 strokes are smooth running, easy to maintain, fuel efficient, quiet, a little cold blooded, and will troll forever.

Sure, they may weigh more and are more expensive than a 2 stroke but they are worth it. If motor weight is a consideration for you, you will probably want to get a 2 stroke.

If you are plannning on doing a lot of river fishing and are getting a pump, go down to the launch at Blue Creek and see what everyone else is running.
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Carl C.