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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.