2019 Yamaha 90 HP F90XB Outboard Motor

The F90XB keeps things conventional: a propeller-driven 90 hp, 1832cc inline-four on a 25-inch shaft, remote mechanical steering, electric start and a listed dry weight of 362 lbs. Where the jet version of this engine trades speed for shallow-water ability, this is the standard lower-unit build most buyers default to.

Matching it to your boat

A 25-inch shaft is sized for a taller transom; measuring correctly matters more here than picking a horsepower number, since a shaft that's too long or short changes how the propeller sits relative to the hull. Remote mechanical steering also means a console-mounted wheel, cables and a control box at the helm rather than a tiller arm at the motor, so confirm your boat is already wired for that setup before ordering.

At 362 lbs, double-check that your transom rating, hoist or trailer-mounted lift is built for the weight, since this is noticeably heavier than smaller portables you may be replacing.

Propeller choice is its own decision on a standard lower unit like this one: pitch and diameter change how quickly the boat gets on plane and what top speed it reaches, and the right choice varies with hull weight and load more than with horsepower alone.

Questions buyers ask

Is this the jet version? No, this is the standard propeller-driven build; Yamaha's jet variant of the 90 hp engine uses a different lower unit entirely.

What's the fuel system? Electronic fuel injection.

What's the warranty? A 3-year Yamaha warranty backs this engine.