6EK-45300-10-8D – Yamaha Lower Unit Assembly (L) 20″ RH Gearbox

The Yamaha 6EK-45300-10-8D Lower Unit Assembly (L) 20" RH is a genuine factory gearbox designed for Yamaha 4-Stroke outboards. Built for right-hand rotation, this lower unit delivers smooth shifting, strong durability, and consistent performance in both saltwater and freshwater conditions.

This gearbox is manufactured to Yamaha’s strict factory standards, ensuring perfect compatibility and long service life. The assembly arrives with housing, driveshaft, and propeller shaft pre-installed, simplifying installation and reducing downtime.

Applications & Compatibility:

• Models: Yamaha F75XB, F90XB, F115XB

• Years: 2014 through 2024

• Rotation: Right-Hand (RH)

• Shaft Length: 20" (L)

The 6EK-45300-10-8D lower unit is ideal for replacing damaged or worn gearcases. Common signs of failure include grinding gears, excessive noise, or oil leaks. Installing this genuine Yamaha unit restores factory performance and reliability, giving boaters confidence on the water.

Key Features:

• Part Number: 6EK-45300-10-8D

• Lower Unit Assembly – 20" Shaft (L)

• Right-Hand Rotation (RH)

• Genuine Yamaha replacement part

• Fits F75XB, F90XB, F115XB (2014–2024)

• Pre-assembled for quick installation

• Heavy-duty construction resists corrosion

• Engineered for smooth shifting and quiet operation

At Arizona Outboard Dismantlers, we specialize in genuine gearcases and lower unit assemblies for Yamaha outboards. The 6EK-45300-10-8D Yamaha Lower Unit Assembly is a direct replacement that keeps your engine running at peak performance.