99999-04542-00 Yamaha 25" extra long gearbox | Genuine Used Part

🔧 Product Description

Genuine Yamaha F200 / F225 25-Inch Lower Unit - Part Number: 99999-04542-00

A genuine used Yamaha complete 25-inch lower unit for selected 3.3L F200, F225, LF200 and LF225 four-stroke outboards. Yamaha service number 99999-04542-00 supersedes 69J-45300-25-8D and related 6S1 production references. Rotation must be confirmed because right-hand and counter-rotation engines use different internal arrangements.

⚙️ Key Features

• Genuine Yamaha large four-stroke lower unit
• Current service part number 99999-04542-00
• Supersedes 69J-45300-25-8D
• Approximately 25.3-inch X-shaft configuration
• Used on 3.3L F200 and F225 engine families

🚤 Compatibility

Commonly used on

• Yamaha F200 and F225 3.3L four-stroke outboards
• Yamaha LF200 and LF225 counter-rotation twins where the correct rotation is confirmed
• 25-inch X-shaft offshore and twin-engine installations

Typically suits

• Yamaha F200TXR / F225TXR
• Yamaha LF200TXR / LF225TXR with rotation-specific verification
• Catalogue use primarily approximately 2002-2013
• Models include early 3.3L V6 four-stroke production before later 4.2L platforms
• HP Range: 200HP - 225HP
• Shaft Length: Approximately 25.3 inches / X
• Gear Ratio: Commonly 2.00:1 for early 3.3L F200 / F225
• Rotation: Must be physically confirmed
• Fitment Requirement: Match model code, rotation, driveshaft and shift-shaft specification

🔌 Function

The gearbox supplies the reduction and rotation needed to drive the propeller and contains the water pump, clutch and propeller-shaft assemblies.

⚠️ Common Signs of Failure

• Standard and counter-rotation units confused
• Water intrusion through propeller-shaft or driveshaft seals
• Bearing-carrier corrosion
• Gear or clutch damage
• Bent shaft, broken skeg or cracked case

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 99999-04542-00 supersedes 69J-45300-25-8D
• Also replaces selected 6S1-45300-22-8D applications
• Related LF counter-rotation assemblies must be verified separately

OEM / Related Numbers

• 99999-04542-00
• 999990454200
• 69J-45300-25-8D
• 6S1-45300-22-8D
• 69J-W0001-series lower-unit seal kit
• 69J-W0078-series water-pump kit
• F200 / F225 3.3L gearcase family

Aftermarket / Verified Equivalents

• Professionally remanufactured Yamaha F200 / F225 25-inch lower units
• Aftermarket bare gearcase housings for selected 3.3L Yamaha applications
• Sierra and Recmar seal, bearing and water-pump kits
• Used genuine 69J / 6S1 lower units after rotation verification
• No standard-rotation gearbox should be substituted for an LF counter-rotation unit

📦 Condition

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