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Recently purchased a 1976 Outrage 21' to fix my kid's "I'm bored" problem. The boat is on a mooring and I want to empower them to take the boat out themselves (they have their boating licenses). The current outboard is a 1993 Yamaha 175HP yet I don't feel comfortable with them going at it alone with that motor which has had moments of inconsistency.

The boat will be used for cruising & fishing around the bay and potentially pulling a tube or a skier (when I'm driving). The last activity (tubing/skiing) is a nice to have not a need to have.

I'm looking for repowering suggestions or recommendations for this size whaler and if I should purchase new or used. Also ballpark all-in cost estimates would be helpful.