4.2 Liter Engine, FAQ | Yamaha Outboards

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Explore the game-changing innovation inside the 4.2L Four Stroke V MAX SHO®. Mouse over the hot spots and toolbar icons for in-depth descriptions of outboard features and benefits.

Cleaner Fuel

Cleaner Fuel

All V MAX SHO® outboards utilize a large, on-engine water separating fuel filter with a water sensor. Used in conjunction with Yamaha’s 10-Micron Water Separating Fuel Filter, it helps separate water and contaminants from the fuel before they can reach the outboard’s other filters and fuel injectors.

Outstanding Fuel Economy

Outstanding Fuel Economy

The 4.2 liter big-bore V MAX SHO® four stroke outboard averages 12% better fuel economy throughout the RPM range than our venerable 3.3 liter direct-injected 250HP V MAX Series 2 two stroke. All air entering the engine block of the V MAX SHO® is routed through a single 75mm electronically controlled throttle valve. Working in concert with the Precision Multi-Point Fuel Injection System, they help ensure the precise amount of air and fuel necessary for optimum power and fuel efficiency. The reduction in friction from the Micro-Textured Cylinder Walls further adds to this outboard’s amazing fuel economy.

Low and Midrange Throttle Response

Low and Midrange Throttle Response

Yamaha’s Variable Camshaft Timing system advances and retards the position of the intake camshaft to dramatically increase power and throttle response in the low- and mid-rpm ranges. This feature helps Yamaha’s new 4.2 liter big-bore V MAX SHO® four stroke provide awesome hole shot and mid-range acceleration you have to feel to believe.

4.2L Big Bore Displacement

4.2 Liter Big-Bore Displacement.

By using a highly advanced thermally applied plasma fusion process on the cylinder walls, the V MAX SHO® has no conventional steel cylinder sleeves, yet the cylinder walls are 60% harder than steel. That means larger cylinder bores for increased displacement, resulting in more power and torque, without increasing outer cylinder dimensions. It also results in dramatically lighter weight, better cooling, and the “micro-textured” cylinder walls help reduce friction, further increasing performance and enhancing reliability.

Responsive Power

Responsive Power

4.2 liters of class-leading displacement teams with individual intake and exhaust camshafts to provide more precise valve timing control with fewer moving parts than conventional rocker arm systems for increased reliability. This superior design also allows for use of 4 valves per cylinder which exchange intake and exhaust gases more efficiently for responsive power and increased fuel economy. Intake valves are 14% larger and exhaust valves are 10% larger than our 3.3L DOHC system.

Smart Design

Smart Design

Yamaha’s exclusive In-Bank™ Exhaust System exits downward through the center of the engine between the “V” of the cylinders, rather than on the exterior side. This increases combustion efficiency for more power and torque, and also provides for a more compact shape.

Smooth and Quiet

Smooth and Quiet

Engine exhaust is routed through a maze before exiting above the waterline through the idle exhaust relief outlet, for unbelievably smooth and quiet operation. A mufflerless design creates a more direct exhaust flow and a pleasing sound of power at idle.

Lightest Weight In ClassLine 1

Lightest Weight In Class

The Yamaha V MAX SHO® is 34 pounds lighter than the V MAX Series 2 it replaces. In fact, no other equivalent-horsepower production V6 bass outboard is lighter, including two strokes. From the specially redesigned engine bracket to the new lightweight cowling, every ounce of weight-savings has been realized without sacrificing durability. There’s even a new advanced polymer composite lower engine pan that helps reduce weight.

Holeshot/AccelerationLine 2

Holeshot/Acceleration

Yamaha’s new V MAX SHO® four stroke out-board utilizes an advanced sensor that allows maximum safe ignition timing. The resulting hole shot and acceleration is so amazing that it outperforms popular two stroke models, and comparable or better top speed performance gets you to your next spot fast - even if it’s miles away. It’s a difference you can feel.

Top Speed Line 3

Top Speed

The Yamaha V MAX SHO® is faster than even the vaunted V MAX Series 2 that it replaces. This means four stroke smoothness, convenience, and reliability; with top speed better than that of our direct-injected two-stroke of comparable horsepower.

Better Cooling, Straighter Tracking Line 4

Better Cooling, Straighter Tracking

The specially contoured high-performance lower unit features a unique curved skeg design* for straighter tracking, while forward-mounted water inlets are redesigned, repositioned, and substantially larger than V MAX Series 2 for increased cooling capacity and efficiency. Inside are specially heat-treated gears for increased durability. These lower units are stock factory production, not an aftermarket add-on, so they're covered by Yamaha's 3-year limited warranty for pleasure or government use.

*not available on the VF250 X Shaft

Powerful Charging Line 5

Powerful Charging

With 46 amps of total alternator power at 1000 rpm and a full 50 amps from 2500 ~ 6000 rpm, V MAX SHO® outboards offer the kind of charging power needed to help operate today’s wide array of on-board electronic devices.

Protection and Power Line 6

Protection and Power

V MAX SHO® outboards have an exhaust pressure reduction system, which not only helps keep the propeller hub cooled from hot exhaust gases, it also helps provide power by transitioning those gases out of the engine during the critical hole shot and acceleration phases.

Easy ConfigurationLine 7

Easy Configuration

Yamaha V MAX SHO® outboards are cable-actuated, mechanical remote controlled. This allows use of our 6X3 flush side-mount remote control. You can even add your own foot-operated throttle for additional convenience.

More InformationLine 8

More Information

Command Link® Gauges (optional) provide accurate, real-time stats on engine operating conditions and selected boat systems. Utilizing true digital communication, the easy-to-read gauges are designed to withstand the elements, and engineered specifically to track the performance of your Yamaha outboard.

More InformationLine 9

Peak Performance

V MAX SHO® Series propellers are available in one-inch incremental pitches from 23" to 27" and in 29". This allows you to fine-tune your wide-open-throttle rpm for tournament level performance on V MAX SHO-powered bass, bay and flats boats.