Yamaha Replacement Lower Unit

Why Choose Our Yamaha Replacement Lower Units

We know replacing a lower unit can be a big investment, so we make sure you get the right product, at the right price.

✔ Direct Fitment Guarantee – Our Yamaha lower units are engineered to match original factory specs.

✔ Broad HP & Model Coverage – From 75HP to 300HP, including popular Yamaha VMAX, Offshore, and F Series.

✔ Tested for Reliability – Every unit is inspected and pressure-tested before shipping.

✔ Nationwide USA Shipping – Fast delivery from trusted warehouses.

✔ Expert Support – Our marine parts team has 10+ years of hands-on experience helping boat owners.

Compatibility & Fitment Guide

To help you select the correct lower unit, here’s a quick compatibility chart:

Yamaha Replacement Lower Unit

Tip: Always match your shaft length (20″, 25″, 30″), rotation type, and gear ratio before ordering.

New vs Remanufactured – Which Should You Choose?

1. New Yamaha Lower Units

Best for: Boaters seeking maximum reliability, factory performance, and the longest possible service life.

Benefits:

• Zero prior wear — All components are brand-new.

• Longest lifespan — Ideal for heavy users or commercial operations.

• Factory precision — Built to exact Yamaha specifications.

• Full warranty coverage — Typically 1–3 years.

Considerations:

• Higher cost compared to remanufactured units.

• Best suited for long-term ownership rather than quick resale.

2. Remanufactured Yamaha Lower Units

Best for: Budget-conscious boaters who still want reliable performance.

Benefits:

• Cost savings — Often 30–40% less than new.

• OEM-quality parts — All worn or damaged components are replaced with brand-new equivalents.

• Tested for quality — Pressure-tested, gear lash checked, and verified to meet factory tolerances.

• Environmentally friendly — Reuses the main housing, reducing waste.

Considerations:

• May have minor cosmetic wear on the exterior.

• Shorter warranty (often 6–12 months) compared to new units.

• Lifespan depends on proper maintenance.

Our Recommendation:

• If you want absolute peace of mind, especially for offshore or high-speed use → Go New.

• If you want dependable performance at a lower price and maintain your engine regularly → Go Remanufactured.

Pro Tip: Regardless of choice, always pair your lower unit with fresh marine gear oil and a new water pump impeller for best results.

How to Replace a Yamaha Lower Unit

Replacing a Yamaha lower unit can be done by a skilled DIY boater or a marine mechanic.
Basic steps include:

1. Remove the propeller and disconnect shift linkage.

2. Unbolt the lower unit from the midsection.

3. Install new gaskets and align driveshaft splines.

4. Torque bolts to factory spec and fill with marine gear oil.

Safety Note: If you’re unsure, hire a professional to avoid damaging seals or gears.

Frequently Asked Questions

Q: How do I know my lower unit needs replacement?
A: Signs include metal shavings in gear oil, unusual vibration, or inability to shift gears.

Q: Are these lower units OEM?
A: We offer OEM-quality new units and remanufactured units that meet or exceed factory standards.

Q: Do you ship across the USA?
A: Yes — fast nationwide delivery, plus expert support for choosing the right part.

Q. Do I need to replace my water pump when installing a new lower unit?
A: Yes — it’s highly recommended to install a new water pump kit during replacement to prevent overheating and extend the life of your engine.

Q. What is the difference between standard and counter rotation lower units?
A: Standard rotation spins clockwise (viewed from the back of the prop). Counter rotation spins counterclockwise and is typically used in twin-engine setups to improve handling.

Q. How do I find my Yamaha outboard’s shaft length?
A: Measure from the mounting bracket to the bottom of the cavitation plate. Common lengths are 20″ (short), 25″ (long), and 30″ (extra long).

Q. How long does shipping take within the USA?
A: Most orders ship within 1–2 business days, with delivery typically in 3–5 business days depending on location.

Q. What warranty do you offer?
A: New units usually include a 1-year manufacturer warranty. Remanufactured units typically carry a 6–12 month warranty.

Q. Can a damaged lower unit be repaired instead of replaced?
A: Minor damage (like a worn seal) can be repaired, but gear or housing damage often makes full replacement more cost-effective.

Q. How can I make my lower unit last longer?
A: Regularly change gear oil, flush with fresh water after saltwater use, replace water pump impellers annually, and avoid striking underwater objects.

Why Trust AllBoatSupplies?

• Experience: Over a decade of supplying outboard parts to professional boat mechanics and DIY boat owners.

• Expertise: Our team is trained in marine engine diagnostics and regularly works with Yamaha service manuals.

• Authoritativeness: Partnered with reputable marine part manufacturers and distributors.

• Trustworthiness: Secure checkout, clear return policy, and verified customer reviews.

Order Your Yamaha Replacement Lower Unit Today

Don’t let a damaged lower unit keep you off the water. Browse our full range of Yamaha replacement lower units and order today for fast shipping and expert support.

Shop Yamaha Replacement Lower Unit →