Yamaha Outboards 90HP F90LB - Outboard Engines Supplier

Description

Overview & Performance

The Yamaha F90LB is part of Yamaha’s latest-generation midrange line-up, offering 90 horsepower through an advanced 1.8-liter, inline-four engine (1,832 cc). It features a single overhead camshaft (SOHC) operating four valves per cylinder, combining lighter weight with improved volumetric efficiency—making it faster, more responsive, and notably more efficient than its predecessor.yamaha-motor.co.nzYamaha Marine Mediabrisbaneyamaha.com.au

At just 353 lbs (160 kg), the F90LB is approximately 13 lbs lighter than the previous model and delivers class-leading torque and acceleration.Yamaha Marine Media  Performance testing shows a noticeable uptick in speed—Yamaha claims gains of about 1 mph in top speed and 0.3 seconds quicker acceleration compared to the F90A model.Yamaha Marine Mediayamahaoutboards.com

Specifications & Technical Features

• Engine type: Inline-4, 4-stroke, SOHC, 16-valve (4 per cylinder)

• Displacement: 1.8 L (1,832 cc)rjnautical.comjetskiofmiami.comJ.D. Power

• Horsepower: 90 hp (67.2 kW) at ~5,500 rpm

• Weight: 353 lbs (160 kg)rjnautical.comJ.D. PowerYamaha Marine Media

• Shaft options: 20″ (LB model) and 25″ (XB model)rjnautical.com+1yamaha-motor.co.nz

• Fuel system: Electronic Fuel Injection (EFI) rjnautical.comJ.D. Power

• Steering/Controls: Remote mechanical; tiller control optionalrjnautical.com+1

• Starter: Electric

• Trim & Tilt: Power-assisted

• Full-throttle RPM: 5,000–6,000 rpmrjnautical.comJ.D. Power

• Alternator output: 35 A—roughly 40% more than previous models—for superior electrical capacityboatspecialists.comYamaha Marine Media

Convenience & Control Features

• Variable Trolling RPM (VTS®): Enables precise trolling speed adjustments in 50-RPM increments (550–1,000 RPM), even allowing operation below idle—a valuable feature for anglers boats Yamaha Marine Media.

• Freshwater Flush Device: Allows engine flushing without starting, enhancing durability and convenience boat.

• Extended Engine Life & Quiet Operation: Incorporates improved muffler design, intake silencer, and engine rigidity to significantly reduce noise—making it quieter at idle and full throttleyamaha-motor.co.nzYamaha Marine Media fish talkma

• Compatibility with accessories: Works seamlessly with Yamaha’s Command-Link® and multifunction gauges, NMEA-2000 systems, Talon SDS™ propellers, and Y-COP® security system Yamaha Marine Mediayamaha-motor

Fuel Efficiency & Real-World Performance

Field testing indicates impressive fuel economy: cruising in the upper 20s (mph) at around 4,500 rpm yielded fuel consumption under 5 gallons/hour, translating to approximately 6 mpg. At wide-open throttle near 40 mph, consumption stayed around 9 gph. Notably, the engine is exceptionally quiet at both idle and high speedsfishtalkmag

Further performance testing using a Zodiac Seasport 490 highlighted excellent economy and responsiveness across speeds. For instance, at 4,500 rpm (~34.8 mph), fuel burn was 4.8 gph (≈7.24 mpg). Top speed around 46.5 mph recorded fuel flow at 10.1

Summary & Ideal Applications

The Yamaha F90LB stands out through its superior power-to-weight ratio, fuel efficiency, and a raft of modern conveniences—making it well-suited for mid-sized inshore boats, offshore fishing craft, and multi-species vessels needing reliable, quiet, and controllable performance.

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