Yamaha Lower Unit
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New Yamaha 75–100HP 2-/4-Stroke (1984–2017) Replacement Lower Unit – Aftermarket | Standard Rotation | Fits 20″ & 25″ Shafts | 2.0 & 2.3 Gear Ratios | 3-Year Warranty
SKU:
ST-90-404
Original price was: $1,330.89.$1,199.00Current price is: $1,199.00.-10%
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New Yamaha 115–130HP 2/4-Stroke (1984–2014) Replacement Lower Unit | Aftermarket | Standard Rotation | Fits 20″ & 25″ Shafts | 3-Year Warranty
SKU:
ST-90-405
Original price was: $1,330.89.$1,199.00Current price is: $1,199.00.-10%
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New Yamaha 150–200HP 2/4-Stroke (1984–2024) Replacement Lower Unit | Aftermarket | Standard Rotation | Fits 20″ & 25″ Shafts | 3-Year Warranty
SKU:
ST-90-416
Original price was: $1,330.89.$1,199.00Current price is: $1,199.00.-11%
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New Yamaha 150–200HP 2/4-Stroke (1990–2024) Replacement Lower Unit | Aftermarket | Counter Rotation | Fits 25″ Shaft | 3-Year Warranty
SKU:
ST-90-418
Original price was: $1,572.25.$1,399.00Current price is: $1,399.00.-10%
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New Yamaha 200–250HP V6 76° (1990–2019) Replacement Lower Unit | Aftermarket | Standard Rotation | Fits 20″, 25″ & 30″ Shafts | 3-Year Warranty
SKU:
ST-90-421
Original price was: $1,330.89.$1,199.00Current price is: $1,199.00.-11%
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New Yamaha 250HP 4-Stroke (2005–2018) Replacement Lower Unit | Aftermarket | Standard Rotation | Fits 20″, 25″ & 30″ Shafts | 3-Year Warranty
SKU:
ST-90-422
Original price was: $1,572.25.$1,399.00Current price is: $1,399.00.
New Yamaha F200–F300 4-Stroke (2014–2021) Replacement Lower Unit | Aftermarket | Standard Rotation | Fits 30″ Shaft | 1.75 Gear Ratio | 3-Year Warranty
SKU:
ST-90-423-B30F
Original price was: $1,921.90.$1,699.00Current price is: $1,699.00.-10%
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New Yamaha 200–250HP 2/4-Stroke (1990–2019) Replacement Lower Unit | Aftermarket | Counter Rotation | Fits 25″ & 30″ Shafts | 3-Year Warranty
SKU:
ST-90-428
Original price was: $1,552.89.$1,399.00Current price is: $1,399.00.-12%
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New Yamaha 250HP 4-Stroke (2005–2018) Counter-Rotation Replacement Lower Unit Aftermarket | Fits 25″ & 30″ Shafts | 2.00 Gear Ratio | 1-Year Warranty
SKU:
ST-90-429
Original price was: $1,921.90.$1,699.00Current price is: $1,699.00.-14%
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New Yamaha F75–100 | F75/90A 4-Stroke (1999–2017) Replacement Lower Unit | Aftermarket | Fits 20″ & 25″ Shafts | New or Remanufactured | 1-Year Warranty
SKU:
YA-G4-02
Original price was: $2,685.09.$2,299.00Current price is: $2,299.00.-14%
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Yamaha F75B | F90B | F115B | VF115 4-Cyl 4-Stroke Lower Unit (2014–2023) | New or Remanufactured | Fits 20″ & 25″ Shafts | 1-Year Warranty
SKU:
YA-G4-03
Price range: $2,499.00 through $2,699.00-11%Hot
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Yamaha F150 | F175 | F200 4-Stroke Lower Unit (2004–2024) | 150–200HP | Fits 20″ & 25″ Shafts | New or Remanufactured | 1-Year Warranty
SKU:
YA-G4-06
Price range: $2,799.00 through $3,099.00Yamaha Lower Unit
The Yamaha lower unit is a critical component of your outboard motor, responsible for transferring power from the engine to the propeller while controlling speed, direction, and overall boat performance. Understanding the difference between replacement and aftermarket lower units can help you choose the right part for your Yamaha outboard.
Replacement Lower Unit
A replacement lower unit is a direct swap for the original lower unit that comes with your Yamaha outboard motor. These are typically OEM (Original Equipment Manufacturer) parts or high-quality equivalents.
Key Points:
- Purpose: Replace a damaged or worn-out lower unit without altering your boat’s performance.
- Quality: Made to the same specifications as the original, ensuring proper fit and function.
- Durability: Designed to meet Yamaha’s standards for reliability and corrosion resistance.
- When to Use:
- If your original lower unit leaks, has worn gears, or damaged seals.
- After hitting underwater obstacles or experiencing mechanical failure.
- Benefits:
- Perfect fit for your Yamaha model
- Maintains factory performance and handling
- Often comes with OEM warranty coverage
Aftermarket Lower Unit
An aftermarket lower unit is a high-quality replacement part made by third-party manufacturers, not Yamaha itself. These units are designed to be compatible with Yamaha outboards while often offering additional features or cost advantages.
Key Points:
- Purpose: Provide a cost-effective alternative to OEM lower units with similar performance.
- Quality: Built to match or exceed OEM specifications, depending on the manufacturer.
- Benefits:
- Often less expensive than OEM replacement units
- May include upgrades or enhancements
- Wide availability for multiple Yamaha models
- When to Use:
- If you need a reliable replacement at a lower cost
- If OEM parts are unavailable or discontinued
Features of Our Yamaha Lower Units
- High-strength aluminum or stainless steel construction
- Corrosion-resistant for long-lasting durability
- Compatible with a wide range of Yamaha outboards (75HP – 100HP+)
- Optimized gear ratios for performance and efficiency
- Trim and tilt functionality for better handling
- Easy maintenance with replaceable seals and lubrication system
- Backed by manufacturer warranties for peace of mind
Frequently Asked Questions (FAQ) – Yamaha Lower Unit
1. What is a Yamaha lower unit?
The Yamaha lower unit is a vital component of the outboard motor that transfers power from the engine to the propeller and controls speed, direction, and overall boat performance.
2. What is the difference between a replacement and an aftermarket lower unit?
A replacement lower unit is an OEM or exact-equivalent part designed to match the original specifications. An aftermarket lower unit is made by third-party manufacturers and offers a cost-effective alternative with compatible performance.
3. How do I know if my lower unit needs replacement?
Signs include unusual noises, leaking oil, damaged gears, propeller shaft issues, or poor performance. Regular inspection can help identify issues early.
4. Are aftermarket Yamaha lower units reliable?
Yes, high-quality aftermarket lower units are built to match or exceed OEM specifications, providing a reliable and cost-effective alternative for your Yamaha outboard motor.
5. How do I maintain my Yamaha lower unit?
Regular maintenance includes inspecting and lubricating gears and bearings, replacing worn seals, keeping the unit clean, and checking for corrosion to ensure long-lasting performance.
Upgrade your Yamaha outboard today with a high-quality lower unit from AllBoatSupplies.com. Ensure maximum performance, durability, and safety on the water.
For any inquiries or if you need help selecting the right lower unit, call us at 888-812-6287. Our experts are ready to assist you!