Description

Read Before You Buy 2023 Suzuki 350HP Engine

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2023 Suzuki 350HP DF350A Outboard Engine For Sale

The 2023 Suzuki 350HP DF350A is a high-performance four-stroke outboard designed for large center consoles, offshore fishing boats, cruisers, performance vessels, and other boats that require substantial propulsion. Producing 350 horsepower from a naturally aspirated V6 platform, this Suzuki combines advanced electronic fuel injection, DOHC technology, Suzuki Lean Burn Control, dual contra-rotating propellers, and drive-by-wire controls for strong acceleration and precise handling.

This used 2023 model has approximately 19 hours, making it a low-hour option for boat owners looking for a modern high-output outboard without moving directly to a new engine.

With its 4.39-liter V6, 24-valve cylinder head, 25-inch shaft, and approximately 730 lbs listed weight, the DF350A is designed for larger boats where high thrust, strong midrange performance, and confident offshore handling are important.

Product Overview

The Suzuki DF350A represents Suzuki’s high-horsepower outboard platform and is engineered around a 55-degree V6 powerhead with dual overhead camshafts and 24 valves.

The engine combines high displacement with a naturally aspirated intake system rather than relying on forced induction. Its high-compression design and sophisticated fuel delivery system help provide strong combustion efficiency and responsive power throughout the operating range.

The dual contra-rotating propeller system is one of the defining features of the DF350A. Two propellers rotate in opposite directions, helping transfer the engine’s substantial output into the water while improving grip and reducing some of the steering effects associated with a single propeller.

For a used engine with only approximately 19 hours, this 2023 Suzuki 350HP can be an attractive choice for a repower project or a boat owner seeking a high-output offshore outboard.

Key Features

• 2023 Suzuki DF350A
• 350 HP output
• Used condition
• Approximately 19 operating hours
• 4.39-liter V6 engine
• 55-degree V6 configuration
• DOHC 24-valve cylinder head
• Four-stroke gasoline engine
• Naturally aspirated
• Electronic Fuel Injection
• Suzuki Lean Burn Control
• Dual fuel injectors per cylinder
• Dual contra-rotating propeller system
• Suzuki Precision Control drive-by-wire system
• Electronic throttle and shift
• 25-inch shaft
• High-compression 12.0:1 design
• 54-amp alternator
• Designed for large and offshore boats
• Suitable for freshwater and saltwater applications with proper maintenance

Technical Specifications

Specification	Details
Product	Suzuki DF350A 350HP
Model Year	2023
Brand	Suzuki
Condition	Used
Category	Outboard Engine
Horsepower	350 HP
Fuel Type	Gasoline
Displacement	4,390 cc / 4.39 L
Cylinder Configuration	V6
Number of Cylinders	6
Engine Type	Four-Stroke
Cylinder Head	DOHC, 24-Valve
Shaft Length	25 inches
Listed Weight	730 lbs
Listed Dry Weight	339 kg / 748 lbs
Hours	Approximately 19
Rated Output	257 kW / 350 HP
Rated Speed	6,300 RPM
Bore	97 mm
Stroke	98 mm
Bore × Stroke	97 × 98 mm
Fuel System	Electronic Fuel Injection
Fuel Management	Suzuki Lean Burn Control
Aspiration	Naturally Aspirated
Alternator	54A
Controls	Suzuki Precision Control / Fly-by-Wire
Propulsion	Dual Contra-Rotating Propellers
Compression Ratio	12.0:1

350HP V6 Performance

The 350HP output gives this Suzuki enough power for larger boats that require strong acceleration and substantial cruising capability.

The V6 architecture provides six cylinders working together to deliver smooth power across the operating range. Its relatively large 4.39-liter displacement also helps provide the torque required to move heavier offshore boats efficiently.

Performance will ultimately depend on the boat’s hull, total weight, propeller configuration, engine mounting height, fuel load, passenger load, water conditions, and other setup factors.

A properly matched DF350A can provide:

• Strong hole-shot performance
• Powerful midrange acceleration
• High cruising capability
• Strong throttle response
• Improved low-speed control
• Excellent thrust for heavier vessels
• High-performance offshore capability

4.39-Liter V6 Engine

At the heart of the DF350A is a 4.39-liter V6 engine.

The engine uses a 55-degree V6 configuration with DOHC and 24 valves, allowing the cylinder heads to efficiently manage intake and exhaust flow.

The 97 mm bore and 98 mm stroke provide a balanced displacement platform designed to deliver substantial power while maintaining smooth four-stroke operation.

The naturally aspirated design also eliminates the need for a turbocharger or supercharger, simplifying the induction system while relying on displacement, compression, valve control, and fuel management to produce the engine’s power.

DOHC 24-Valve Design

The DF350A uses a dual overhead camshaft and 24-valve cylinder head.

With four valves per cylinder, the engine can efficiently manage the movement of intake air and exhaust gases through the combustion chamber.

The DOHC arrangement supports precise valve timing and helps the engine maintain strong breathing characteristics at higher engine speeds.

For a 350HP outboard, this design contributes to responsive acceleration and consistent power delivery throughout the operating range.

Electronic Fuel Injection

The Suzuki 350HP uses an advanced electronic fuel injection system.

According to the supplied specifications, the DF350A uses multi-point sequential fuel injection with dual injectors per cylinder.

Electronic fuel delivery allows the engine management system to precisely control fuel delivery according to engine speed and operating conditions.

Benefits include:

• Responsive throttle operation
• Consistent fuel delivery
• Improved starting performance
• Efficient combustion
• Better control across varying engine loads
• Stronger overall drivability

Suzuki Lean Burn Control

Suzuki Lean Burn Control is designed to optimize fuel delivery under appropriate operating conditions.

Rather than maintaining the same fuel strategy throughout the entire operating range, the system can adjust fuel delivery according to engine load and operating conditions.

This can help improve fuel economy during cruising and lower-load operation.

Actual fuel consumption will always depend on the hull, speed, engine trim, propeller selection, sea conditions, passenger load, and throttle position.

Dual Contra-Rotating Propellers

One of the most distinctive characteristics of the DF350A is its dual contra-rotating propeller system.

Instead of transferring power through a single propeller, the system uses two propellers rotating in opposite directions.

This design helps the engine transfer its substantial horsepower to the water while providing strong propeller grip.

Potential advantages include:

• Increased thrust
• Improved acceleration
• Better grip during maneuvering
• Efficient transfer of high engine output
• Improved handling characteristics
• Reduced propeller torque effects

The dual-propeller design is particularly useful on heavier boats where maximizing available thrust is important.

Suzuki Precision Control

The DF350A is equipped with Suzuki Precision Control, a drive-by-wire system that electronically manages throttle and shift commands.

The system replaces conventional mechanical control cables with electronic communication between the helm and engine.

This provides smooth and precise control during:

• Starting
• Docking
• Low-speed maneuvering
• Acceleration
• Cruising
• Engine shifting

For a high-horsepower outboard, precise throttle and shift control can make the boat easier to operate, particularly during low-speed maneuvering around docks and marinas.

25-Inch Shaft

This particular engine is listed with a 25-inch shaft.

Correct shaft length is essential when matching an outboard to a boat because the engine must sit at the appropriate height relative to the hull and waterline.

Before installation, buyers should verify:

• Transom height
• Engine mounting position
• Propeller clearance
• Water-intake position
• Steering arrangement
• Control compatibility
• Boat manufacturer’s recommended shaft length

The DF350A can be available in other shaft configurations depending on the exact model and application, but this particular product is listed as a 25-inch configuration.

Fuel Requirements

The Suzuki DF350A is a gasoline-powered outboard with a relatively high 12.0:1 compression ratio.

The supplied product information recommends high-octane unleaded gasoline, generally around the 90+ octane range.

For a high-output engine, clean and properly stored fuel is important.

Owners should pay attention to:

• Fuel quality
• Water contamination
• Fuel filter condition
• Fuel-system cleanliness
• Proper fuel storage
• Ethanol compatibility
• Tank ventilation

Using fuel that meets the engine manufacturer’s requirements helps protect performance and fuel-system components.

Offshore and Saltwater Applications

The DF350A is particularly well suited to boats that spend substantial time offshore.

Its high horsepower and V6 configuration make it appropriate for vessels where strong acceleration, cruising power, and heavy-load performance are important.

Potential applications include:

• Large center console boats
• Offshore fishing boats
• Sport fishing boats
• Large recreational boats
• Deck boats
• Performance boats
• Cruisers
• Heavy offshore vessels
• Long-distance recreational boats

The engine is designed for marine use and can operate in saltwater, but proper corrosion prevention is essential.

After saltwater use, regular freshwater flushing and inspection should be part of the maintenance routine.

Low-Hour 2023 Used Engine

With approximately 19 hours, this engine has relatively low reported operating time for a used marine engine.

However, engine hours should never be the only factor used to determine the condition of a used outboard.

A professional inspection should ideally verify:

• ECM/diagnostic history
• Actual engine hours
• Service records
• Engine oil condition
• Gearcase condition
• Cooling-system operation
• Fuel-system condition
• Propeller condition
• Trim and tilt operation
• Steering operation
• Charging system
• Electrical connections
• Corrosion
• Lower-unit seals
• Physical condition of the cowling and powerhead

A low-hour engine with incomplete maintenance history should still be inspected carefully.

Charging System

The listed specification includes a 54-amp alternator.

High-output charging capability is useful on modern offshore boats because today’s vessels can carry substantial electrical loads, including:

• Fish finders
• Chartplotters
• Radar
• VHF radios
• Livewell systems
• Bilge pumps
• Navigation equipment
• Audio systems
• Lighting
• Electric steering systems
• Battery management equipment

The exact usable charging output can vary with engine speed and electrical demand.

Weight and Installation

The supplied specification lists the engine at approximately 730 lbs, with a separate dry-weight figure of approximately 748 lbs.

Because these figures conflict, the exact weight should be confirmed from the engine identification and configuration before final installation planning.

This is particularly important for smaller boats because the DF350A is a substantial outboard.

Before installing a 350HP engine, verify:

• Maximum boat horsepower
• Maximum transom weight
• Transom construction
• Engine mounting system
• Steering system
• Battery capacity
• Fuel-system capacity
• Rigging compatibility
• Propeller clearance
• Boat balance

A professional rigging assessment is recommended for a repower installation.

Propeller Considerations

The DF350A’s dual contra-rotating propeller system requires appropriate propeller selection.

Propeller setup should be matched to:

• Hull design
• Boat weight
• Engine mounting height
• Intended cruising speed
• Passenger load
• Fuel load
• Performance requirements
• Target wide-open-throttle RPM

The correct setup should allow the engine to operate within its recommended WOT range while providing the desired acceleration and cruising characteristics.

For this engine, the supplied information lists a recommended WOT range of approximately 5,700–6,300 RPM.

Maintenance

Regular maintenance is essential for maintaining the performance and reliability of a high-output outboard.

Routine service should include:

• Engine oil inspection and replacement
• Oil filter replacement
• Gearcase lubricant service
• Fuel filter inspection
• Spark plug inspection
• Cooling-system checks
• Water-pump inspection
• Propeller inspection
• Battery inspection
• Charging-system testing
• Steering-system inspection
• Trim and tilt inspection
• Corrosion protection
• Diagnostic-system checks

Saltwater operation requires additional attention to corrosion prevention and freshwater flushing.

Boat Applications

Large Center Console Boats

A 350HP Suzuki is well suited to large center consoles where high acceleration and offshore cruising performance are priorities.

Offshore Fishing Boats

The combination of V6 power, dual propellers, and electronic controls makes the DF350A a strong choice for offshore fishing applications.

Cruisers

Larger recreational cruisers can benefit from the engine’s substantial torque and high horsepower.

Performance Boats

The 350HP output provides significant acceleration and high-speed potential when installed on a hull designed for this level of propulsion.

Heavy-Load Boats

Large boats carrying substantial fuel, passengers, equipment, and fishing gear can benefit from the additional thrust available from a 350HP outboard.

Why Choose to Buy 2023 Suzuki 350HP Engine?

This engine combines a large-displacement V6 powerhead with sophisticated fuel management and Suzuki’s dual-propeller propulsion technology.

Important advantages include:

• 350 HP output
• 4.39L V6
• DOHC 24-valve design
• Electronic Fuel Injection
• Suzuki Lean Burn Control
• 12.0:1 compression ratio
• Dual contra-rotating propellers
• Suzuki Precision Control
• Drive-by-wire throttle and shift
• 25-inch shaft
• Approximately 19 hours
• 2023 model year
• High-output 54A alternator
• Natural aspiration
• Four-stroke operation
• Strong offshore capability

Frequently Asked Questions

How much horsepower does the Suzuki DF350A produce?

The Suzuki DF350A produces 350 horsepower.

How many hours are on this 2023 Suzuki 350HP?

The listed operating time is approximately 19 hours.

What is the displacement of the Suzuki 350HP?

The DF350A uses a 4.39-liter, 4,390cc V6 engine.

How many cylinders does the DF350A have?

The engine uses six cylinders in a V6 configuration.

Is the Suzuki 350HP a four-stroke?

Yes. The DF350A is a four-stroke gasoline outboard.

Does the Suzuki DF350A use fuel injection?

Yes. It uses electronic fuel injection, with advanced fuel management designed to optimize combustion and performance.

What is the compression ratio?

The supplied specifications list a 12.0:1 compression ratio.

What type of propeller system does it use?

The DF350A uses dual contra-rotating propellers, with two propellers rotating in opposite directions.

What controls does the Suzuki 350HP use?

The engine uses Suzuki Precision Control, a drive-by-wire electronic throttle and shift system.

What is the shaft length?

This particular engine is listed with a 25-inch shaft.

What RPM range does the engine operate at wide open throttle?

The supplied product information lists a recommended WOT range of approximately 5,700–6,300 RPM.

Is the Suzuki 350HP suitable for saltwater?

Yes. It is designed for marine use and can be used in saltwater with appropriate flushing, corrosion protection, and routine maintenance.

What boats can use a Suzuki 350HP?

It can be appropriate for large center consoles, offshore fishing boats, cruisers, performance boats, deck boats, and other vessels engineered for 350HP propulsion.

Is 19 hours considered low for a used outboard?

Approximately 19 hours is relatively low operating time for a used engine, but the actual condition should be confirmed through diagnostic records, inspection, and service history.

Important Specification Note

The supplied product information contains a weight discrepancy. One section lists the engine at approximately 730 lbs, while the detailed specification lists a dry weight of approximately 339 kg / 748 lbs.

For the product page, the more important confirmed characteristics are the 350HP output, 4.39L V6 configuration, four-stroke operation, 25-inch shaft, EFI, Suzuki Precision Control, and approximately 19 operating hours.

The exact engine weight should be verified from the engine identification, serial number, and specific factory configuration before final installation.

Final Thoughts

The 2023 Suzuki 350HP DF350A is a powerful, technologically advanced outboard for boat owners who need serious propulsion capability. Its 4.39L V6 engine, DOHC 24-valve design, electronic fuel injection, Lean Burn Control, dual contra-rotating propellers, and Precision Control make it particularly well suited to large offshore and performance-oriented boats.

With only approximately 19 reported hours, this used 2023 engine offers a compelling combination of modern technology and low operating time. As with any used high-horsepower marine engine, buyers should verify the engine hours, diagnostic history, service records, physical condition, lower unit, cooling system, and rigging compatibility before installation.