Yamaha F150 20 Lower Unit Gearcase
Yamaha F150 20” Four Stroke Lower Unit Gearcase 150hp F150LB F150LA
This listing is for a replacement 20-inch (Long Shaft) lower unit specifically designed for Yamaha’s F150 series four-stroke outboards.
Key Specifications:
- Shaft Length: 20 inches (L). This is the “Long” shaft model, designed for a standard transom height.
- Engine Compatibility: Designed for the Yamaha F150 4-stroke engine.
- Model Suffixes: The listing specifically mentions compatibility with the F150LA and F150LB models. These suffixes often indicate model years and minor specification differences, but the core lower unit assembly is the same.
- Horsepower: 150 HP.
Important Considerations Before Purchase:
- Confirm Your Exact Model: While it lists F150LA and F150LB, you must verify your engine’s full model number and serial number to ensure 100% compatibility. Using your serial number is the most reliable way to find the correct part.
- Gear Ratio: The F150 typically uses a 2.00:1 gear ratio. It’s wise to confirm the unit you are purchasing has this ratio.
- New, Remanufactured, or Used? The listing title does not specify the condition. It is critical to determine if this is:
- New (OEM or Aftermarket): Check the description for warranty info (e.g., 1-year OEM, 3-year aftermarket like SEI).
- Remanufactured: A rebuilt unit, typically with a shorter warranty (e.g., 1 year).
- Used (As-Is): Likely has little to no warranty.
- What’s Included: Does the price include a new water pump kit, seals, and hardware? Or are these sold separately?
- Core Charge: If the unit is remanufactured, there will likely be a core charge that is refunded when you return your old, damaged lower unit.
What to Look For in the Listing:
- Part Number: Look for the Yamaha OEM part number (e.g., something like
6HP-45300-XX-XX) or an aftermarket brand name (e.g., SEI). - Warranty: This is the best indicator of quality. A 3-year warranty suggests a new aftermarket unit, a 1-year warranty could be OEM new or a high-quality remanufacture, and a short warranty suggests a used or lower-quality rebuild.
- Seller Reputation: Purchase from a reputable marine parts dealer.
Summary: This appears to be the correct 20″ long shaft unit for many F150 models. Your next step is to carefully read the full item description to determine its condition (new/reman/used), warranty, and what is included to ensure it represents good value and reliability for your needs.
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