6E5-45300-1A-8D Yamaha 20" Long shaft gearbox | Genuine Used Part

🔧 Product Description

Genuine Yamaha 20-Inch V4 Lower Unit - Part Number: 6E5-45300-1A-8D

A genuine used Yamaha complete 20-inch right-hand lower unit for 115HP and 130HP V4 two-stroke outboards. The assembly uses the established 6E5 V4 gearcase design and a 2.00:1 reduction ratio. Yamaha 6E5-45300-1A-8D is the later long-shaft service number replacing several earlier 6E5 lower-unit assemblies.

⚙️ Key Features

• Genuine Yamaha complete lower-unit assembly
• Correct part number 6E5-45300-1A-8D
• 20-inch long-shaft configuration
• 2.00:1 gear reduction
• Standard right-hand propeller rotation

🚤 Compatibility

Commonly used on

• Yamaha 115HP and 130HP V4 two-stroke outboards
• 20-inch L-shaft right-hand installations
• CETO, TLR, Saltwater Series and related mechanical-control engines

Typically suits

• Yamaha 115CETO / 115TLR / C115 / S115
• Yamaha 130BETO / 130TLR / S130
• Model-year coverage approximately 1988-2006 depending on market
• Published diagrams include 115 and 130 V4 long-shaft engines using the 1A-8D service assembly
• HP Range: 115HP - 130HP
• Shaft Length: 20 inches / L
• Gear Ratio: 2.00:1
• Rotation: Right-hand
• Fitment Requirement: Confirm driveshaft length, shift-shaft height and propeller-shaft rotation

🔌 Function

The gearbox changes the direction and speed of engine power, selects forward, neutral and reverse and drives the propeller while its water pump supplies cooling water.

⚠️ Common Signs of Failure

• Gear oil contains water or metal
• Unit slips or jumps out of gear
• Propeller shaft is bent or loose
• Water pump output is weak
• Housing or skeg is cracked or heavily corroded

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 6E5-45300-1A-8D supersedes 6E5-45300-18-8D
• Also replaces 6E5-45300-17-8D, 6E5-45300-16-8D and selected earlier 14 / 15-series assemblies
• Earlier 4D, 8D and EK colour suffixes may appear in historical catalogues

OEM / Related Numbers

• 6E5-45300-1A-8D
• 6E5453001A8D
• 6E5-45300-18-8D
• 6E5-45300-17-8D
• 6E5-45300-16-8D
• 6E5-45300-15-8D
• 6E5-45300-14-8D
• 6E5-W0001-series seal kit

Aftermarket / Verified Equivalents

• SEI Marine SE405 / 90-405-A20 - 20-inch, 2.00:1 Yamaha V4 replacement lower unit
• Professionally remanufactured 6E5 Yamaha V4 gearcases
• Aftermarket forward, reverse and pinion gear sets
• Sierra, Recmar and other lower-unit seal and bearing kits
• Aftermarket water-pump kits and 6E5-pattern impellers

📦 Condition

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