Yamaha F150 20 Lower Unit Gearcase

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:

1. 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.
2. 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.
3. 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.
4. What’s Included: Does the price include a new water pump kit, seals, and hardware? Or are these sold separately?
5. 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.