The best replacement for outboard motors is inboard motors.

The best alternatives to outboard motors are rated as following:
★★★★★  inboard motors
★★★★  inboard
★★★  2 stroke
★★  honda
★★  inboard outboard motors
★★  outboard motors
★  freshwater motors
★  4 stroke outboard motors
★  sterndrive
  trolling motors
  inboard outboard
  four stroke

Your alternative for outboard motors is not listed? Suggest!
Speaking about outboard motors, one probably shouldn't forget about boat.

Other search terms related to outboard motors and their ratings are:
★★★★★ boat
You have in mind a companion for outboard motors and it is not yet here? Propose!



Google Trends

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