63V-45300-15-8D Yamaha Long Shaft Gearbox | Genuine Used Part

🔧 Product Description

Genuine Yamaha 9.9HP-15HP 20-Inch Long-Shaft Complete Gearcase - Part Number: 63V-45300-15-8D

A genuine Yamaha long-shaft complete lower unit for 9.9HP, 13.5HP and 15HP two-stroke outboards. It is the 20-inch counterpart to the 63V short-shaft assembly and uses the longer driveshaft and shift-rod arrangement.

⚙️ Key Features

• Genuine Yamaha complete gearcase
• Correct current part number 63V-45300-15-8D
• 20-inch long-shaft configuration
• Standard rotation
• Used on 9.9HP-15HP two-strokes

🚤 Compatibility

• Yamaha 9.9FMH long-shaft models
• Yamaha 13.5HP long-shaft models
• Yamaha 15FMH and related 15HP long-shaft models
• 20-inch transom configuration
• Approximate application era: mid-1990s onward

🔌 Function

The lower unit transmits power to the propeller, changes direction through the shift clutch and pumps cooling water through the long-shaft midsection.

⚠️ Common Signs of Failure

• Long driveshaft is bent
• Gear oil is contaminated
• Shift engagement is incomplete
• Propeller-shaft seals leak
• Skeg is damaged
• Wrong short or long unit is installed

🔄 Supersession & Cross Reference

OEM Supersession Chain

• Related long-shaft revisions include 63V-45300-10-4D, 11-4D, 12-4D and 13-4D
• Later finish revisions progressed through 14-8D to 15-8D
• Short-shaft 63V-45300-05-8D is not interchangeable without changing driveshaft and shift components

OEM / Related Numbers

• 63V-45300-10-4D
• 63V-45300-11-4D
• 63V-45300-12-4D
• 63V-45300-13-4D
• 63V-45300-14-8D
• 63V-45300-15-8D

Aftermarket / Verified Equivalents

• OVERSEE and clone-platform 63V long-shaft replacement lower units
• Parsun, Hidea and Powertec 9.9HP-15HP functional alternatives after confirming spline and shift length
• Aftermarket seal, bearing, gear and water-pump kits

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated