Mercury Reliability
The Yamaha may be more reliable but I hate it. The mercury 15 I have had for 18 years 1 set of plugs. I have a 3,3 Mercury that's 20 years old and it's had a few sets of plugs and a fuel shut off valve. The 25 Mercury I had for about 15 years and it suffered 1 fuel pump diaphragm. The Yamaha I've had 3 years and it has been reliable but it doesn't have anywhere near the power of the 15hp Merc. It will not plane four adults and two dogs in a twelve foot Achilles rib. It barely manages two adults and the two dogs. The Merc will plane the same load easily. The only thing the Yamaha does better is idle quietly. Which it will do for hours. No doubt it's a better trolling motor. I will say I've had the good fortune to all of these above sea level.
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