Yamaha 350HP V6 & 450HP XTO Offshore Outboards

Yamaha Offshore Outboards – 450HP XTO & 350HP V6 4.3L

Unmatched Offshore Power

For captains, anglers, and luxury boaters who demand strength, endurance, and innovation, Yamaha’s offshore lineup delivers uncompromising performance. Leading the charge are two powerhouse options — the Yamaha 450HP XTO Offshore V8 and the Yamaha 350HP V6 4.3L Offshore. Both engines are designed for large center consoles, sportfishers, and offshore cruisers, offering either flagship power or a perfectly balanced mix of muscle and efficiency.

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Lineup Overview

• Yamaha XTO 450 (450 XTO Yamaha):
  Yamaha’s flagship V8 with integrated electric steering, full Digital Electronic Control (DEC), and seamless Helm Master EX integration. Built for the largest offshore boats and multi-engine rigs.
• Yamaha 350HP V6 4.3L:
  A next-generation, high-displacement V6 offering robust torque, smoother acceleration, and refined fuel efficiency—ideal for serious offshore fishing and cruising.

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Pricing & Availability

If you’re researching the Yamaha XTO 450 price or 350HP Yamaha outboard price, note that final cost depends on several factors:

• Shaft length
• Rotation (standard or counter)
• Rigging package (DEC/Helm Master EX)
• Multi-engine configuration

Open individual product cards for live pricing and ETA, or request a quote by sharing your hull type, typical load, desired WOT RPM, and control/steering preferences.

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Saltwater Engineering

Both the 450HP XTO and 350HP V6 4.3L are built for the toughest marine conditions. Each includes Yamaha’s advanced anti-corrosion coatings, heavy-duty charging systems, and cooling/exhaust designs tuned for sustained offshore runs. Always flush engines after use and follow Yamaha’s maintenance schedule for best results.

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Integrated Steering & Control (XTO Highlight)

• Built-in electric-hydraulic steering eliminates external pumps and clutter.
• Full compatibility with Digital Electronic Control (DEC) and Helm Master EX (joystick, SetPoint®, Autopilot, Pattern Shift).
• Exceptional low-speed authority for docking, station-keeping, and close-quarters handling.

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Rigging Options

Available in single, twin, triple, or quad configurations (depending on hull certification).
Choose shaft length, rotation pairs, and steering systems to match transom setup and target WOT range.

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Warranty & Support

All Yamaha offshore outboards include a limited Yamaha factory warranty (coverage varies by program and region).
PartsVu supports ownership with:

• OEM service kits and filters
• Genuine rigging components
• Fast nationwide shipping and product assistance

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Maintenance Snapshot

Follow Yamaha’s 100-hour / annual service interval:

• Engine oil and filter
• Gear lube
• Fuel filters
• Spark plugs
• Anodes
• Water-pump inspection

For commercial or heavy offshore use, shorten service intervals accordingly. Always use OEM fluids and parts and have all DEC/Helm Master EX calibrations completed by authorized Yamaha dealers.

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Model Breakdowns

Yamaha 450HP XTO Offshore Outboard – The Pinnacle of Power

The 450HP XTO Offshore represents Yamaha’s ultimate offshore statement. With integrated steering, Digital Electronic Control, and unmatched displacement, this V8 is made for the largest offshore vessels. It combines sheer torque and thrust with intelligent control for smooth operation across any sea state.

Key Features – 450 XTO

• 450 horsepower designed for heavy offshore hulls
• Integrated steering and DEC for unmatched precision
• Massive displacement ensures relentless acceleration and midrange torque
• Powerful low-speed thrust for docking and positioning
• Advanced cooling and exhaust systems built for durability
• Seamless Helm Master EX integration with joystick and autopilot

Best For: Offshore anglers, luxury yacht captains, and professionals who demand maximum power, control, and integration.

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Yamaha 350HP V6 4.3L Offshore Outboard – The Next Evolution

Introducing a new standard in offshore reliability and balance, the Yamaha 350HP V6 4.3L brings a bigger displacement platform with refined efficiency. Designed for large sport boats and deep-V fishing machines, it offers confident torque, smooth operation, and long-term dependability.

Key Features – 350 V6 4.3L

• All-new 4.3L V6 for greater torque and faster acceleration
• Strong midrange pull ideal for heavy offshore loads
• Advanced EFI system for superior fuel economy and throttle response
• Proven Yamaha reliability engineered into every component
• Supports multi-engine configurations for larger offshore rigs

Best For: Offshore anglers, families, and boaters wanting balanced strength and efficiency without stepping up to the 450HP.

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Why Choose Yamaha Offshore Outboards?

• Unmatched horsepower options for any offshore demand
• Fuel-efficient V6 and V8 platforms built for endurance
• Proven Yamaha reliability trusted by captains worldwide
• Flexible rigging: single, twin, triple, or quad setups
• Supported by extensive dealer network and OEM parts availability

Whether you choose the 450HP XTO’s muscle and integration or the 350HP V6’s smooth efficiency, Yamaha’s offshore lineup gives you the confidence to run harder, fish longer, and cruise farther.

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Frequently Asked Questions – Yamaha 450HP XTO & 350HP V6 4.3L

Q: Can I use these engines in saltwater?
A: Yes. Both models are purpose-built for offshore saltwater operation. Just remember to flush the system after each trip and follow Yamaha’s maintenance guidelines.

Q: What’s special about the XTO’s steering system?
A: It features built-in electric-hydraulic steering inside the midsection—no external pumps—providing a cleaner helm, tighter response, and seamless integration with Helm Master EX joystick and autopilot.

Q: Is the Yamaha XTO 450 worth it over the 350 V6?
A: Choose the 450HP XTO for the biggest, heaviest hulls or multi-engine offshore setups requiring full digital control. Choose the 350HP V6 4.3L for powerful, efficient performance with lighter rigging.

Q: Do both engines require dealer setup?
A: Yes. All DEC-equipped Yamaha outboards must be installed and configured by authorized Yamaha dealers to ensure proper calibration.

Q: Can I rig twins, triples, or quads?
A: Absolutely. Both models support multi-engine configurations when the hull is rated for it.

Q: How much do they cost?
A: Pricing varies by shaft length, rotation, control package, and installation details. Check product cards for live pricing or request a personalized quote.

Q: Where can I find detailed specs like weight or WOT RPM?
A: Visit each product’s page for full specifications including weight, dimensions, gear ratio, alternator output, and wide-open-throttle range.