Yamaha Lower Unit Seal Kit 93101-25M03 90430-08003 F40G F70A F80A/B F100A/D

Lower Unit Seal Kit for Yamaha

This lower unit seal kit is a complete replacement set for Yamaha outboard motors, including model numbers F40G, F70A, F80A/B, and F100A/D, providing all necessary seals to prevent gear oil leaks and water intrusion; it references OEM cross-reference numbers 93101-25M03 and 90430-08003.

Overview

This lower unit seal kit is an essential maintenance item for Yamaha outboard lower units, containing all gaskets and seals needed to rebuild the gearcase. It is designed for boat owners and mechanics performing lower unit service on select Yamaha four-stroke and two-stroke models. The kit ensures a watertight seal and protects the gears and bearings from corrosion.

Built For Performance

• Includes all necessary seals, O-rings, and gaskets for a complete lower unit reseal
• Made from OEM-grade rubber and nitrile compounds for durability
• Engineered to match Yamaha factory specifications
• Prevent water ingress and gear oil leakage

Fits These Machines

• for Yamaha F40G
• for Yamaha F70A
• for Yamaha F80A
• for Yamaha F80B
• for Yamaha F100A
• for Yamaha F100D

On-The-Job Use

• Used during lower unit oil seal replacement and gearcase overhaul
• Ensures reliable performance in both saltwater and freshwater environments
• Commonly installed during tune-ups and winterization

Specs At A Glance

Good To Know

Q: What is included in this seal kit? A: The kit includes all required seals, O-rings, and gaskets for a lower unit reseal, typically totaling over 10 pieces. It covers the driveshaft, propshaft, and shift shaft seals.

Q: How often should the lower unit seal kit be replaced? A: It is recommended to inspect the seals annually and replace them if any oil leaks or water intrusion is detected. Many owners replace the seals every 2-3 seasons as preventive maintenance.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.