6E5 UL Yamaha Ultra Long Gearbox 115CETO 140CETO | Genuine Used Part

🔧 Product Description

Genuine Yamaha V4 25-Inch Ultra-Long Lower Unit - 6E5 Gearcase Family

A genuine used Yamaha right-hand-rotation lower unit identified as a 6E5-family ultra-long gearbox for selected 115HP, 130HP and 140HP V4 two-stroke outboards. In Yamaha Australian and export catalogues, the UL or X designation in this family normally refers to the approximately 25-inch shaft configuration rather than a 30-inch gearcase. The exact stamped 6E5-45300 service suffix should be confirmed on the housing before installation.

⚙️ Key Features

• Genuine Yamaha V4 complete lower-unit assembly
• Approximately 25-inch ultra-long / extra-long shaft configuration
• Common 2.00:1 V4 gear ratio family
• Standard right-hand propeller rotation unless physically identified otherwise
• Suitable for rebuilding selected 115CETO, 130BETO and 140CETO mounting combinations

🚤 Compatibility

Commonly used on

• Yamaha Precision Blend V4 two-stroke outboards
• Approximately 25-inch X / UL transom-height installations
• Remote-control saltwater and commercial configurations

Typically suits

• Yamaha 115CETO / 115TXR / C115 / S115 where a 25-inch 6E5 lower unit is specified
• Yamaha 130BETO / 130TXR / L130 / S130
• Selected Yamaha 140CETO / L140CET installations after driveshaft, shift-shaft and casing verification
• Typical V4 production spans approximately the late 1980s through mid-2000s
• HP Range: Approximately 115HP - 140HP
• Shaft Length: Approximately 25 inches / X / UL
• Gear Ratio: Commonly 2.00:1
• Rotation: Right-hand unless physically identified otherwise
• Fitment Requirement: Confirm complete stamped suffix, driveshaft spline, shift direction and water-pump arrangement

🔌 Function

The lower unit transmits crankshaft power through the driveshaft, forward and reverse gears and propeller shaft while also housing the water pump and providing steering skeg protection.

⚠️ Common Signs of Failure

• Milky or contaminated gear oil
• Excessive propeller-shaft or driveshaft play
• Gear jumping or failure to engage
• Bearing or gear whine
• Cracked housing, damaged skeg or corroded sealing surfaces

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 6E5-45300-2A-8D is the best-supported later 25-inch right-hand service assembly
• 6E5-45300-27-8D and 6E5-45300-28-8D are related 25-inch V4 service references
• The supplied inventory marking 6E5 UL does not identify the complete Yamaha suffix and requires physical verification

OEM / Related Numbers

• 6E5 UL inventory / casting identification
• 6E5-45300-2A-8D
• 6E5-45300-27-8D
• 6E5-45300-28-8D
• 6E5-45300-2A-EK related export-finish reference
• 6E5-W0001-series lower-unit seal kit
• 6E5-W0078-series water-pump repair kit
• 6E5-45371-01-00 trim-tab anode

Aftermarket / Verified Equivalents

• SEI Marine SE405 / 90-405-A25 - 25-inch, 2.00:1 Yamaha V4 replacement lower unit
• Professionally remanufactured Yamaha 115HP-140HP V4 lower units
• Aftermarket 6E5 gear sets, seal kits, bearing kits and water-pump kits are widely available
• Sierra 18-6097 or equivalent trim-tab anode replaces Yamaha 6E5-45371-01
• Counter-rotation units are not interchangeable with this standard-rotation family

📦 Condition

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