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My apologies if this topic has been done to death but my search did not turn up useful threads.

This winter I will replace the engine on my 2005 Montauk 170. Currently, it has a 90 HP Mercury Salt motor that has always felt too heavy on this boat. The motor runs fine, but I want to upgrade a) to get a more modern motor and b) if possible to loose some weight so the boat will trim better.

I have researched reliability and performance and am leaning towards a Suzuki or a Yamaha, with some consideration of Honda. I would appreciate any comments about user experiences here.

Part of the question is HP. The model resource page here says that the boat will take a 70 HP motor and if an outboard this size will get the boat out of the hole and run easily, I think I will consider going that route, if I can save weight.

The Suzukis in 70 and 90 weigh the same at 344 pounds. The Yamaha 75 and 90 are each 353 poubnds. There is a i L "Midrange" 70 hp Yamaha that is lighter at 253 pounds but I am not sure what I would be giving away with the smaller displacement (1.8 L Yamaha, 1.5L Suzuki versus 1.0 Liter Suzuki 70 HP).

I would appreciate any help and recommendations. Given the unknowns about the smaller Yamaha, I am leaning toward the 90 HP Suzuki.

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All the brands make a reliable and efficient 90 hp engine. It really comes down to features, price and dealer support.

Since Covid, prices have skyrocketed. The typical install costing 13-17K depending on model selected and state sales tax.

Suzuki has the lowest price, Honda is the most expensive.

As for power, the 170 is a heavy 17' model. With a 90hp, WOT is ~45 mph running light and solo. Add some people and gear, bottom paint and your looking at 40 mph.

A 70hp will reduce the WOT significantly into the low 30's. Resale will be affected.

Ensure you select a good stainless prop and mount the engine at least 2 holes up.