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Hank,
Looking at it with the size boat, 13', I think you may be better served with let's say an 8 HP Honda 4 stroke. The older 8 and 10 HP models can be had for ~ $450. These things will run forever and in my opinion would push your boat at a pretty good clip. I'm looking at acquiring an 8-10 HP to mount on a bracket on the swim platform of my 15'. This will allow me to use it on the restricted lake I grew up on. Best of luck and thanks for reading my 2 cents worth.
Matt