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I'm running a one of the new Mercury 150 Fourstrokes on my 18 Outrage, along with a kicker and with a separate portable tank that I keep in the splash well. I haven't noticed any problems with the weight. So far the motor has proven reliable and durable(I've now hit both logs and rocks with it) and it is exceptionally fuel efficient while being very strong in the power department.

Good luck with your repower, I should think you will be happy with any modern motor and I think having great local dealer support should be one of the most important factors when selecting a motor.