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When I did my research on repowering my 20' outrage which I have owned since day 1 , I looked at price, weight, feedback and dealer network.

I test drove a boat with the 150 Mercury 4stroke and was impressed. I didn't care that I had to replace controls etc because if I'm going to drop 12k+, I'm not going to use old controls or cables. I also replaced all the fuel lines, battery setup, interior lighting and stereo system. The Mercmonitor Eco gauge was the only hesitation I had but am very happy with it.

The weight of the Mercury 150 four stroke is listed at 455 plus 15lbs for the 25" shaft. So that's 470. The Yamaha is listed at 489 but that's the 20" shaft. They don't list the weight of the 25" that I can find. So, I'll guess the same as Mercury putting the Yamaha f200 at 504lbs? I'm sure I'll be corrected if I'm wrong which is fine.

I have the Nmea 2000 network which like the above post allows engine parameters to display on my chart plotter if I want. Overall, I'm happy with my choice.

So, as Joe pointed out, you have many options and things to consider. Good luck. If you want to chat about anything, shot me a message and I'll give you my number to chat.

Great boat BTW.
Stephen.