Yamaha 2T 9.9HP-15HP Lower Unit
63V-45300-10-4D
Will work on any YAMAHA 2T outboard 9.9HP-15HP from 1996′ onwards…L-shaft.
Fully reconditioned, serviced (oil, seals, impeller, pressure tested) and ready for action.
Also many more other gearboxes are stock available, please check with us!
Global Shipping Made Easy
| Region | Delivery Time | Special Notes |
|---|---|---|
| USA/Canada | 1-3 days | No customs |
| Europe | 2-4 days | CE certified |
| Australia | 3-5 days | AMSA approved |
460.00$
(FREE SHIPPING)
Yamaha 2T 9.9HP–15HP Lower Unit Assembly
Experience Unmatched Power and Smooth Performance
The Yamaha 2T 9.9HP–15HP Lower Unit Assembly (Part No. 63V-45300-10-4D) is built for boaters who demand reliability, performance, and precision. Whether you’re cruising calm lakes or tackling choppy coastal waters, this genuine Yamaha part ensures flawless power delivery and dependable operation. Designed specifically for Yamaha 2-stroke outboards, it’s the perfect choice for replacing a worn or damaged lower unit while boosting your engine’s overall efficiency.
Key Features
⚙️ Premium Marine-Grade Build
Crafted from corrosion-resistant aluminum alloy, this lower unit is engineered to withstand harsh marine environments — from saltwater corrosion to high-impact debris. Yamaha’s precision manufacturing ensures long-lasting durability and minimal maintenance over years of use.
🚀 Optimized Power Transfer
With a finely tuned gear ratio designed for Yamaha 2T 9.9HP–15HP engines, you’ll experience smoother acceleration, higher torque, and efficient speed control. This ensures maximum performance whether you’re fishing, cruising, or transporting cargo.
🌊 Quiet and Smooth Operation
Yamaha’s advanced engineering minimizes vibration and mechanical noise, delivering a smooth, quiet boating experience. Enjoy the peace of the water without the harsh sounds of engine strain or gear chatter.
🔧 Quick, Hassle-Free Installation
The Yamaha 2T Lower Unit Assembly is designed for easy fitment, ensuring quick installation without special tools. Whether installed by a marine technician or a skilled DIY enthusiast, setup is fast, efficient, and straightforward.
⚓ Guaranteed Fit and Compatibility
This assembly is purpose-built for Yamaha 2-stroke 9.9HP–15HP models, ensuring a perfect fit and optimal alignment. Using genuine Yamaha parts means you’re maintaining your engine’s integrity and protecting its long-term performance.
💨 Reliable Propeller Engagement
Experience precise control and rapid throttle response with secure propeller engagement. This reliability is key for smooth navigation and confident handling during fishing, towing, or high-speed cruising.
Benefits
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✅ Improved Engine Efficiency – Enjoy smoother performance and reduced fuel consumption.
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✅ Enhanced Durability – Built tough to resist corrosion, wear, and impact damage.
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✅ Superior Thrust and Speed – Optimized gearing delivers powerful, consistent propulsion.
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✅ Low Maintenance Design – Simplified servicing and long lubrication intervals.
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✅ OEM Quality Assurance – Genuine Yamaha engineering for guaranteed performance.
Technical Specifications
| Specification | Details |
|---|---|
| Model Compatibility | Yamaha 2-Stroke 9.9HP–15HP Outboards |
| Part Number | 63V-45300-10-4D |
| Gear Ratio | Factory-optimized for Yamaha engines |
| Material | Corrosion-resistant aluminum alloy |
| Weight | Approx. [Insert if known] |
| Finish | Anti-corrosive marine-grade coating |
| Installation | Plug-and-play compatible with Yamaha OEM design |
Why Choose the Yamaha 2T 9.9HP–15HP Lower Unit?
Yamaha is known for precision, power, and endurance — and this lower unit assembly embodies all three.
By choosing genuine Yamaha parts, you ensure that your outboard maintains its factory-level performance, fuel efficiency, and reliability.
Whether you’re replacing a damaged component or upgrading for smoother operation, this lower unit offers the perfect balance of durability and performance to keep you confidently on the water.
Frequently Asked Questions (FAQ)
1. What does the lower unit do in an outboard motor?
The lower unit transfers power from the engine to the propeller shaft, converting engine energy into thrust that moves your boat forward or backward.
2. How do I know if my Yamaha lower unit needs replacement?
If you notice grinding noises, vibration, leaking oil, or poor propeller performance, your lower unit may be worn or damaged and should be inspected or replaced.
3. Is this lower unit compatible with all Yamaha 9.9HP–15HP outboards?
Yes — this specific assembly fits all Yamaha 2-stroke 9.9HP–15HP models. Always confirm your engine model number before purchase to ensure a precise match.
4. Can I install this unit myself?
Yes. The Yamaha 2T lower unit is plug-and-play compatible, meaning experienced DIY boaters can install it using standard tools. However, professional installation is recommended for best results.
5. Does the unit come pre-lubricated?
Most Yamaha lower units ship pre-filled with factory lubrication, but it’s always good practice to verify and top up with Yamalube gear oil before first use.
6. How often should I service my lower unit?
Yamaha recommends checking the lower unit oil every 50–100 hours of operation and performing a full inspection annually to ensure optimal performance.
Conclusion
The Yamaha 2T 9.9HP–15HP Lower Unit Assembly (63V-45300-10-4D) is your key to restoring and enhancing your engine’s full potential.
With its tough construction, precise gearing, and smooth operation, it ensures a more efficient and reliable ride every time you set out.
Upgrade today with a genuine Yamaha lower unit — and enjoy long-lasting performance, reduced maintenance, and complete confidence on the water.
