63V-45300-03-4D 63V-45300-05-8D Yamaha Gearcase | Genuine Used Part

🔧 Product Description

Genuine Yamaha 9.9HP-15HP 15-Inch Short-Shaft Complete Gearcase - Current Part Number: 63V-45300-05-8D

A genuine Yamaha short-shaft complete lower unit for selected 9.9HP, 13.5HP and 15HP two-stroke outboards. Earlier grey-painted assembly 63V-45300-03-4D progressed through later 8D finish revisions to current 63V-45300-05-8D.

⚙️ Key Features

• Genuine Yamaha complete short-shaft gearcase
• Current part number 63V-45300-05-8D
• Earlier number 63V-45300-03-4D
• 15-inch short-shaft configuration
• Used on 9.9HP-15HP two-strokes

🚤 Compatibility

• Yamaha 9.9FMH and related 9.9HP two-stroke models
• Yamaha 13.5HP two-stroke model families
• Yamaha 15FMH and related 15HP two-stroke models
• 15-inch short-shaft configuration
• Approximate application era: mid-1990s onward

🔌 Function

The gearcase provides forward and reverse reduction, supports the propeller and contains the water pump and exhaust outlet.

⚠️ Common Signs of Failure

• Gear oil is milky
• Unit jumps out of gear
• Short driveshaft is bent
• Shift rod is misadjusted
• Housing or skeg is damaged
• Water-pump output is low

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 63V-45300-00-4D → 01-4D → 02-4D → 03-4D
• 63V-45300-03-4D → 63V-45300-03-8D → 04-8D → 05-8D
• The 8D suffix identifies the later Yamaha grey finish

OEM / Related Numbers

• 63V-45300-03-4D
• 63V-45300-03-8D
• 63V-45300-04-8D
• 63V-45300-05-8D
• Related short driveshaft, gear set, propeller shaft and water-pump kit

Aftermarket / Verified Equivalents

• OVERSEE replacement 63V short-shaft lower unit
• Parsun, Hidea and Powertec 9.9HP-15HP clone-platform lower units when spline, shift rod and water tube match
• Aftermarket Yamaha 63V seal, bearing, gear and water-pump kits

📦 Condition

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