The all-new 1.8-liter I-4 F90 features greater displacement and a single-overhead-camshaft design with four valves per cylinder. This boosts power and volumetric efficiency, streamlines design, and makes the F90 a leader in torque and acceleration.
WHAT'S INCLUDED
Additional Features
The F115, F90, and F75 feature Precision Multi-Point Electronic Fuel Injection with optimized fuel atomization for maximum efficiency, composite intake manifolds with long tube intake tracks that boost low-end and midrange torque for powerful hole shots, and TCI microcomputer ignition that adjusts timing for optimal performance under all conditions. With lightweight, compact designs utilizing double overhead camshaft on the F115 and single overhead camshaft on the F90 and F75—all with four valves per cylinder—plus upgraded 1.8-liter displacement on the 90 and 75 hp models that dropped 13 pounds for thrilling acceleration and torque, these engines are protected by Phaze Five™ five-layer anti-corrosive paint with YDC-30 alloy, stainless steel drive components, wet sump pressurized oil delivery, comprehensive Engine Warning System, updated Water Draining Intake Duct with side intakes, and labyrinth exhaust system for measurably quieter operation. They deliver 35 amps of charging power (40-45% more than predecessors), feature compatibility with Yamaha's award-winning Multi-Function Tiller Handle integrating all controls, Variable Trolling RPM Switch (VTS®) for precision trolling adjustment in 50-RPM increments from 650-900 RPM (115 hp) or 550-1000 RPM (90/75 hp) including sub-idle capability, and Freshwater Flush Device for easy maintenance without starting the engine.
