Yamaha 6GR-45300-05-8D Lower Unit Assy

Yamaha OEM Lower Unit Assy 6GR-45300-05-8D | F425 XTO Offshore 25.2″ Gearcase

Genuine Yamaha OEM Lower Unit Assembly, part number 6GR-45300-05-8D, designed for selected Yamaha high-performance 425 HP XTO Offshore outboard engines.

This is a complete genuine Yamaha lower unit assembly for the 25.2-inch X shaft configuration, finished in Yamaha’s original Dark Bluish Gray / Gray color.

The lower unit is a major drivetrain assembly incorporating the gearcase, drive components and associated internal mechanisms. It is an ideal OEM replacement for a damaged lower unit or for restoring a Yamaha XTO Offshore outboard to factory specification.

Product Details

• Manufacturer: Yamaha Marine
• OEM Part Number: 6GR-45300-05-8D
• Product: Lower Unit Assy
• Assembly Type: Complete Lower Unit / Gearcase Assembly
• Shaft Length: X – 25.2″
• Colour: Gray / Dark Bluish Gray
• Yamaha Color Code: 8D / 008D
• Condition: Genuine Yamaha OEM Part
• Application: High-performance Yamaha 425 HP outboards

Compatible Yamaha Outboard Engines

This part number is used on selected applications including:

• Yamaha F425A XTO Offshore
• Yamaha XF425 XTO Offshore

The 6GR-45300-05-8D specification corresponds specifically to the X (25.2″) shaft version. Yamaha also produced different lower-unit assemblies for U (30.2″) and E (35.2″) shaft configurations, so shaft length must be verified before ordering.

Supersession Information

6GR-45300-05-8D has been superseded by Yamaha OEM part number 6GR-45300-06-8D.

The newer 6GR-45300-06-8D is listed as replacing several previous versions, including 6GR-45300-05-8D.

If you are searching for a replacement for 6GR-45300-05-8D, the current superseding part number should therefore be checked before ordering.

Important Fitment Information

⚠️ Please verify the complete engine model, serial number and shaft length before ordering.

This is a highly model-specific OEM assembly. The 25.2″ X-shaft version is different from the 30.2″ U-shaft and 35.2″ E-shaft versions.

The part number 6GR-45300-05-8D should not be substituted solely based on engine horsepower.

Why Buy Genuine Yamaha OEM?

A genuine Yamaha lower unit provides factory-designed fitment and compatibility with the original Yamaha drivetrain, allowing replacement of a damaged lower unit without compromising the original engine configuration.

Genuine Yamaha OEM Part – direct replacement for selected Yamaha F425/XF425 XTO Offshore applications.

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