Yamaha 90 Jet | F90JB

Yamaha built this F90JB around a 1.8-liter inline-four with a single overhead camshaft and four valves per cylinder, describing the redesign as lighter and quicker off the line than the engine it replaced. It is the jet-drive version, sending power to the water through a jet pump instead of a propeller, on a 25-inch shaft with remote mechanical steering, electric start and a dry weight of 354 lbs. Notably, this particular listing does not include a propeller, which makes sense given the jet lower unit does not use one. Before ordering Confirm exactly what hardware ships with this unit, since the no-propeller note is worth double-checking against the physical listing rather than assumed. A 25-inch shaft needs a taller transom, and remote mechanical steering means a console and cables are required rather than a tiller handle. Buyers new to jet drives should also plan for the different cooling-intake clearance these units need compared with a standard lower unit. Questions buyers ask What comes standard? Power trim and tilt, the jet lower unit, a steering link arm and an owner's manual. Why pick a jet drive over a prop? Jet units let a boat work in shallow or debris-filled water where an exposed propeller would be at risk, trading away some low-speed thrust to do it. What's the warranty? This engine carries a 3-year warranty term.