68V-45300-34-8D Yamaha 25" Extra Long Shaft Gearbox | Genuine Used Part

🔧 Product Description

Genuine Yamaha F115 / LF115 25-Inch Standard-Rotation Gearcase - Part Number: 68V-45300-34-8D

A genuine Yamaha 25-inch extra-long lower unit for selected F115 and LF115 inline-four four-stroke outboards. The 68V family was also used as the engineering basis for Yamaha-derived Mercury FourStroke powerheads, but complete Mercury interchange must be verified by serial number, driveshaft, shift rod and paint / mounting configuration.

⚙️ Key Features

• Genuine Yamaha F115 complete gearcase
• Correct part number 68V-45300-34-8D
• 25-inch extra-long shaft
• Standard propeller rotation
• Used on early-generation F115 four-strokes

🚤 Compatibility

• Yamaha F115TXR / F115TLR 25-inch standard-rotation model families
• Yamaha LF115 families where standard-rotation gearcase specification applies
• Documented 2002 F115TXRA
• Documented 2005 F115TLR
• Documented 2006 F115AET
• Approximate application era: 2000-2014
• 25-inch X-shaft and standard rotation

🔌 Function

The gearcase reduces the four-stroke engine speed, provides forward and reverse, carries propeller thrust and pumps cooling water through the extra-long midsection.

⚠️ Common Signs of Failure

• Mercury cross-platform unit is assumed interchangeable without checking
• Gear oil contains water
• Propeller shaft or driveshaft is bent
• Shift clutch is worn
• Bearing carrier corrodes
• Wrong shaft length or rotation is installed

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 68V-45300-34-8D is a later X-shaft service revision
• 68V-45300-32-8D is an earlier related assembly
• Related suffixes include 31 and 33 revisions
• 68V-45300-14-8D is the related 20-inch standard-rotation unit

OEM / Related Numbers

• 68V-45300-34-8D
• 68V-45300-32-8D
• 68V-45300-31-8D
• 68V-45300-33-8D
• 68V-45300-14-8D long-shaft counterpart
• Related F115 driveshaft, gear set and bearing carrier

Aftermarket / Verified Equivalents

• Specialist remanufactured Yamaha F115 25-inch lower units
• SEI or other replacement F115 gearcases where the exact model and ratio are supported
• Used genuine Yamaha 68V assemblies
• Yamaha-derived Mercury 75HP-115HP FourStroke units are cross-platform relatives but not verified direct complete-unit equivalents without serial validation
• Aftermarket seal, bearing and water-pump kits

📦 Condition

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