Yamaha F150 25 Four Stroke Lower Unit

Yamaha F150 25″ Four-Stroke Lower Unit (OEM Gearcase)

Product Overview

Restore your Yamaha outboard to peak performance with the OEM Yamaha F150 25″ Four-Stroke Lower Unit Gearcase. Built for precision, strength, and reliability, this genuine Yamaha component is engineered to perfectly fit F150XB, F150XA, and all previous 25″ F150 models. Whether you’re replacing a damaged lower unit or upgrading for improved efficiency, this part ensures optimal operation and longevity.

Key Features

1. OEM Factory Quality

• Genuine Yamaha OEM lower unit from the newer F150XB model.

• Supersedes older models for the latest design and engineering standards.

• Manufactured with premium marine-grade materials for durability and corrosion resistance.

2. Excellent Condition — Fully Inspected & Re-Sealed

• Professionally inspected by a Yamaha 5-Star Certified Technician.

• All components checked for proper clearances and tolerances.

• Re-sealed, pressure-tested, and shimmed where necessary to ensure perfect factory condition.

• 100% ready for immediate installation.

3. Shaft Length

• Shaft Length: 25″ (X – Extra Long)

• Unsure of your shaft length? Here’s how Yamaha codes it:

  • S = 15″ (Short Shaft)

  • L = 20″ (Long Shaft)

  • X = 25″ (Extra Long Shaft)

  • U = 30″ (Ultra Long Shaft)

4. Water Pump

• Water pump not included, allowing flexibility to install your preferred brand or upgrade to a performance model.

Compatibility

This Yamaha 25″ lower unit fits the following Yamaha F150 Four-Stroke Outboard Models:

Manufacturer Information

• OEM Part Number: 63P-45300-14-8D

• Supersedes: 63P-45300-12-8D

• Condition: Used / Fully Serviced OEM

• Warranty: 1-Year Limited Warranty (parts and workmanship)

Why Choose the Yamaha F150 25″ Lower Unit

✅ OEM Yamaha part — engineered for precision fit and reliability
✅ Re-sealed and pressure-tested by certified marine technicians
✅ Long-lasting durability with corrosion-resistant coating
✅ Easy installation — direct bolt-on replacement
✅ Backed by warranty for peace of mind

Installation Notes

This lower unit does not include a water pump kit, giving you flexibility to use your preferred brand. For best results, Yamaha recommends replacing the impeller and seals during installation and using Yamalube Marine Gearcase Lube for optimal performance.

Conclusion

The Yamaha F150 25″ Four-Stroke Lower Unit Gearcase combines OEM quality with expert reconditioning for smooth, efficient, and dependable performance. Designed for long-lasting operation and compatibility with multiple Yamaha models, it’s the ideal choice for serious boaters who value reliability and precision. Trust Yamaha’s engineering excellence to keep you on the water — season after season.

Frequently Asked Questions (FAQ)

Q1: Is this lower unit compatible with all Yamaha F150 models?
This unit is compatible with all Yamaha F150XA, F150XB, and 25″ shaft models from 2004 onward. Always verify your model number before purchase.

Q2: Does this lower unit include a water pump?
No, the water pump is not included. You can reuse your existing pump or purchase a new Yamaha OEM kit separately.

Q3: Is this an OEM Yamaha part or aftermarket?
This is a genuine OEM Yamaha lower unit, not an aftermarket replacement.

Q4: Has the unit been tested?
Yes. Each unit is pressure-tested, re-sealed, and inspected by a certified Yamaha technician to ensure full factory performance.

Q5: What warranty does it come with?
This Yamaha lower unit includes a 1-year limited warranty covering workmanship and materials when installed according to manufacturer guidelines.

Q6: Can I install this myself?
While installation is straightforward, professional installation is recommended to ensure proper alignment and seal integrity.