Four Stroke Outboard Engines

Four stroke outboards featuring excellent usability; the lineup includes portable and tiller handle-equipped models

Four stroke outboards featuring excellent usability; the lineup includes portable and tiller handle-equipped models

Four stroke outboards featuring excellent usability; the lineup includes portable and tiller handle-equipped models

Four stroke outboards featuring excellent usability; the lineup includes portable and tiller handle-equipped models

Four stroke outboards featuring excellent usability; the lineup includes portable and tiller handle-equipped models

These in-line 4 models have 1,596cm3 displacement, featuring DOHC: Double Overhead Camshaft for better valve timing control. Four valves equipped on each cylinder improve the intake and exhaust efficiency. There are many variation models such as an out put difference or fuel induction system difference.

Power & Performance

Long plastic intake manifold with surge tank

Because it is made of plastic, the long intake manifold is lightweight. The surge tank cancels the pulsation from other cylinders caused by the intake action and helps achieve smooth intake air flow for effective and equal delivery to each cylinder

Multi-point fuel injection

This system delivers precisely calculated fuel to the combustion chamber with optimum timing to realize high performance, superior fuel economy and clean emissions.

Reliability & Durability

ECM microcomputer control

ECM is a microcomputer for engine control. Based on the information gathered by various sensors, ECM precisely controls ignition timing and the amount of fuel injected so that the engine is always kept in optimum condition.

Unique intake silencer with porous duct simple single throttle body

The porous duct mainly reduces middle frequency intake noise.

Comfort & Economy

Vapor Burning System

The fuel vapor generated by the heat of the engine is sent to the combustion chamber through the canister and the idle speed controller, and excessive vapor is absorbed by the canister to prevent atmospheric pollution

Long-Span Mounting System

The Long-Span Low Vibration Mount System and larger rubber mounts prevent the transmission of engine vibration to the hull through the bracket.

The in-line 4-cylinder models deliver high performance in a lightweight and compact package. These are multi-functional outboards with excellent fuel economy and great versatility.

Power & Performance

16-valve double overhead cam

The cylinder head features four valves per cylinder, which makes 16 valves in total. Smaller valves weigh less and allow high-speed operation. They supply more air and allow smooth exchange of intake fuel and exhaust gas for more power.

VCT variable camshaft timing (F200F/F200G)

The VCT, which advances and retards the camshaft timing according to the engine rpm, the electronically controlled single throttle valve system and a pulse tuned long intake manifold increase intake efficiency, thereby boosting low and mid-range torque foroptimum acceleration

Long intake manifold *Except F150D/ F150F

The skillfully designed durable plastic intake manifold provides noise reduction as well as low speed stability.

Here is an image of the F115B. The type of manifold used differs by model.

Reliability & Durability

Intake Air Drainig System *Except F115A

Trendy side intake designed top cowling foreseen latest technology incorporated power head. Superior water separation ability has been inherited in.

Multi-point fuel injection

The ECM controlled multi-point electronic fuel injection system precisely measures the fuel and injects it into the combustion chamber at the optimum timing to increase performance and assure quick engine start in various environmental conditions such as temperature, and after long storage periods.

Comfort & Economy

Twin balance shafts (F200F/F200G/F175A/F150D)

Engine vibration is minimized by the twin balance shaft engaged with the crankshaft and the damper fitted to the flywheel. Best tuned mount system reduces boat vibration transmitted from the engine

Labyrinth exhaust system

Yamaha’s proven labyrinth exhaust system which gradually expands exhaust gases through a labyrinth greatly suppresses engine noise at low to medium speeds.

The in-line 4-cylinder models deliver high performance in a lightweight and compact package. These are multi-functional outboards with excellent fuel economy and great versatility.

Power & Performance

16-valve double overhead cam

The cylinder head features four valves per cylinder, which makes 16 valves in total. Smaller valves weigh less and allow high-speed operation. They supply more air and allow smooth exchange of intake fuel and exhaust gas for more power.

VCT variable camshaft timing (F200F/F200G)

The VCT, which advances and retards the camshaft timing according to the engine rpm, the electronically controlled single throttle valve system and a pulse tuned long intake manifold increase intake efficiency, thereby boosting low and mid-range torque foroptimum acceleration

Long intake manifold *Except F150D/ F150F

The skillfully designed durable plastic intake manifold provides noise reduction as well as low speed stability.

Here is an image of the F115B. The type of manifold used differs by model.

Reliability & Durability

Intake Air Drainig System *Except F115A

Trendy side intake designed top cowling foreseen latest technology incorporated power head. Superior water separation ability has been inherited in.

Multi-point fuel injection

The ECM controlled multi-point electronic fuel injection system precisely measures the fuel and injects it into the combustion chamber at the optimum timing to increase performance and assure quick engine start in various environmental conditions such as temperature, and after long storage periods.

Comfort & Economy

Twin balance shafts (F200F/F200G/F175A/F150D)

Engine vibration is minimized by the twin balance shaft engaged with the crankshaft and the damper fitted to the flywheel. Best tuned mount system reduces boat vibration transmitted from the engine

Labyrinth exhaust system

Yamaha’s proven labyrinth exhaust system which gradually expands exhaust gases through a labyrinth greatly suppresses engine noise at low to medium speeds.

The in-line 4-cylinder models deliver high performance in a lightweight and compact package. These are multi-functional outboards with excellent fuel economy and great versatility.

Power & Performance

16-valve double overhead cam

The cylinder head features four valves per cylinder, which makes 16 valves in total. Smaller valves weigh less and allow high-speed operation. They supply more air and allow smooth exchange of intake fuel and exhaust gas for more power.

VCT variable camshaft timing (F200F/F200G)

The VCT, which advances and retards the camshaft timing according to the engine rpm, the electronically controlled single throttle valve system and a pulse tuned long intake manifold increase intake efficiency, thereby boosting low and mid-range torque foroptimum acceleration

Long intake manifold *Except F150D/ F150F

The skillfully designed durable plastic intake manifold provides noise reduction as well as low speed stability.

Here is an image of the F115B. The type of manifold used differs by model.

Reliability & Durability

Intake Air Drainig System *Except F115A

Trendy side intake designed top cowling foreseen latest technology incorporated power head. Superior water separation ability has been inherited in.

Multi-point fuel injection

The ECM controlled multi-point electronic fuel injection system precisely measures the fuel and injects it into the combustion chamber at the optimum timing to increase performance and assure quick engine start in various environmental conditions such as temperature, and after long storage periods.

Comfort & Economy

Twin balance shafts (F200F/F200G/F175A/F150D)

Engine vibration is minimized by the twin balance shaft engaged with the crankshaft and the damper fitted to the flywheel. Best tuned mount system reduces boat vibration transmitted from the engine

Labyrinth exhaust system

Yamaha’s proven labyrinth exhaust system which gradually expands exhaust gases through a labyrinth greatly suppresses engine noise at low to medium speeds.

Yamaha’s lineup of outboards powered by the dependable 3.4 liter V6 engine are designed to provide the right power combination for a broad range of uses and operating environments to ensure customer satisfaction.

Power & Performance

VCT: Variable Camshaft Timing

This system regulates intake valve open/close timing according to engine load.

It heightens air intake efficiency and enhances torque in the low to mid RPM range

Electronically controlled single throttle valve / long intake manifold

The electronically controlled single throttle valve precisely controls the air intake, and a long intake manifold efficiently routes this air to combustion chambers to provide greater torque and power

Reliability & Durability

Water pump (F250H/F200B)

The cartridges of the water pump are given a hard chrome plating to protect against internal abrasion even when used in muddy water.

Direct ignition

A new style plug cap with a built-in ignition coil provides higher reliability since it reduces wiring and is much simpler and compact in design.

Vapor reduction system

This system minimizes fuel vapor generated by engine heat and facilitates smooth restarting

Electrodeposited inside / outside paint process

Newly adopted electrodeposited inside/outside paint coating and anodic coating (alumite) thoroughly guard the engine and exhaust system against corrosion.

Comfort & Economy

Blow-By Gas Re-burning System

The Blow-By Gas Re-Burning System removes any unburned fuel from blow-by gases and sends it to the combustion chamber to be burned

Water-sealed outer wall

Cooling water provided around the muffler reduces exhaust noise and protects the exhaust system from corrosion.

Yamaha’s lineup of outboards powered by the dependable 3.4 liter V6 engine are designed to provide the right power combination for a broad range of uses and operating environments to ensure customer satisfaction.

Power & Performance

VCT: Variable Camshaft Timing

This system regulates intake valve open/close timing according to engine load.

It heightens air intake efficiency and enhances torque in the low to mid RPM range

Electronically controlled single throttle valve / long intake manifold

The electronically controlled single throttle valve precisely controls the air intake, and a long intake manifold efficiently routes this air to combustion chambers to provide greater torque and power

Reliability & Durability

Water pump (F250H/F200B)

The cartridges of the water pump are given a hard chrome plating to protect against internal abrasion even when used in muddy water.

Direct ignition

A new style plug cap with a built-in ignition coil provides higher reliability since it reduces wiring and is much simpler and compact in design.

Vapor reduction system

This system minimizes fuel vapor generated by engine heat and facilitates smooth restarting

Electrodeposited inside / outside paint process

Newly adopted electrodeposited inside/outside paint coating and anodic coating (alumite) thoroughly guard the engine and exhaust system against corrosion.

Comfort & Economy

Blow-By Gas Re-burning System

The Blow-By Gas Re-Burning System removes any unburned fuel from blow-by gases and sends it to the combustion chamber to be burned

Water-sealed outer wall

Cooling water provided around the muffler reduces exhaust noise and protects the exhaust system from corrosion.

F300B/250D/F225F are 4-stroke outboard motors that provide high performance in packages designed to be the lightest outboards in the 225 to 300hp classes. These models achieve class-leading performance, lightness and compactness. Various Yamaha Motor technologies were incorporated to give good fuel economy, convenience, and environmental friendliness.

Power & Performance

Plasma-fused sleeveless cylinders

These are the first outboards in the world to feature sleeveless cylinders employ plasma fusion technology. This produces cylinders that are lighter, more heat-resistant, abrasion-resistant and recyclable.

Lightest weight in its class

These outboards utilize Yamaha’s unique weight-saving technologies in various places including the plasma-fused sleeveless cylinders and plastic bottom cowling, producing a class-leading V6 displacement of 4.2 liters while being the lightest in the V6 class.

Reliability

24 valve DOHC engine

The newly developed DOHC power unit has a 4,169cm3 displacement and a 60ｰ V-6 cylinder format and 24 valves. It pumps out exceptional power and speed performance with outstanding fuel economy, plus the famous Yamaha reliability.

ECM

The ECM (Engine Control Module) constantly controls fuel injection volume, injection timing and ignition timing to improve combustion efficiency in all types of use conditions.

Convenience

70-ampere alternator

The electric system utilizes the highest 70-ampere alternator in its class, a handy feature which can help power today’s wide array of onboard electronic devices.

Options

Smooth shift dampener system

Yamaha’s exclusive new smooth shift dampener system greatly reduces noise commonly associated with shifting gears. It will be available with renewed Saltwater Series II propellers.

Digital network gauge

The digital gauge offers a lot of information to the operator to help provide effective and easy operation. The LCD screen can display speed, rpm, trim, cooling water temperature and pressure, oil pressure, fuel flow, battery voltage, shift position, clock, engine synchronization, warning, diagnosis and so on.

F300B/250D/F225F are 4-stroke outboard motors that provide high performance in packages designed to be the lightest outboards in the 225 to 300hp classes. These models achieve class-leading performance, lightness and compactness. Various Yamaha Motor technologies were incorporated to give good fuel economy, convenience, and environmental friendliness.

Power & Performance

Plasma-fused sleeveless cylinders

These are the first outboards in the world to feature sleeveless cylinders employ plasma fusion technology. This produces cylinders that are lighter, more heat-resistant, abrasion-resistant and recyclable.

Lightest weight in its class

These outboards utilize Yamaha’s unique weight-saving technologies in various places including the plasma-fused sleeveless cylinders and plastic bottom cowling, producing a class-leading V6 displacement of 4.2 liters while being the lightest in the V6 class.

Reliability

24 valve DOHC engine

The newly developed DOHC power unit has a 4,169cm3 displacement and a 60ｰ V-6 cylinder format and 24 valves. It pumps out exceptional power and speed performance with outstanding fuel economy, plus the famous Yamaha reliability.

ECM

The ECM (Engine Control Module) constantly controls fuel injection volume, injection timing and ignition timing to improve combustion efficiency in all types of use conditions.

Convenience

70-ampere alternator

The electric system utilizes the highest 70-ampere alternator in its class, a handy feature which can help power today’s wide array of onboard electronic devices.

Options

Smooth shift dampener system

Yamaha’s exclusive new smooth shift dampener system greatly reduces noise commonly associated with shifting gears. It will be available with renewed Saltwater Series II propellers.

Digital network gauge

The digital gauge offers a lot of information to the operator to help provide effective and easy operation. The LCD screen can display speed, rpm, trim, cooling water temperature and pressure, oil pressure, fuel flow, battery voltage, shift position, clock, engine synchronization, warning, diagnosis and so on.

The new F350A model has pursued new potential in outboards, breaking the constraints of conventional power units for offshore applications. Its innovative and stylish form sets it apart from existing offshore outboards and hints at its high level of performance. In addition to the adoption of a V8 5.3 liter engine, which is a world-first for outboards, it also boasts the latest, original technologies. The end result is the realization of outstanding power and speed, superior durability and reliability, and a new dimension in ride comfort.

Power & Performance

Electronic single throttle/ Long intake manifold

The electronically controlled single throttle and long intake manifold with its changed intake structure provides the optimum amount of air to the combustion chambers, enabling the engine to produce maximum torque and power.

VCT: Variable Camshaft Timing

This system regulates intake valve open/close timing according to engine load. It heightens air intake efficiency and increases torque in the low to mid RPM range.

Reliability & Durability

Compact in-bank exhaust

The in-bank exhaust system helps enhance engine performance by sending exhaust gases out more efficiently and reducing exhaust pressure.

Oversized strong mounting bracket

The bracket and mount system with forged parts and oversized mounting bracket provide plenty of durability and help protect the motor from shocks during offshore cruising in rough waters.

Durable lower unit bearings

An engine with as much power and torque as this needs lower unit bearings and bearing surfaces that stand up to the test. Yamaha has not only changed the type of bearings and / or increased their size, but also hardened the surfaces on which they ride, for increased reliability.

Operability

Variable trolling RPM

Allows the adjustment of desired trolling speed at every 50 rpm between 600 and 1000 rpm.

Digital electronic throttle & shift

liminates remote control cable. Ensures smooth throttle and sure shifting for reliable operability.