Shop Yamaha Outboard Lower Units

Looking to replace the lower unit on your Yamaha F115 outboard motor? We offer OEM Yamaha lower unit assemblies that arrive fully assembled and ready to install—so you can restore power and get back on the water fast.

The lower unit is a critical part of your Yamaha F115 outboard. It connects the engine to the propeller, converting vertical engine power into forward thrust. Inside, you'll find essential components like the gears, water pump, and driveshaft. If this part is compromised, it can lead to serious performance loss—or even permanent engine damage if left unchecked.

At YamahaOnlineParts.com, we make it easy to find the right OEM lower unit replacement for any F115 model. Whether you're fixing damage from hitting submerged debris or simply swapping out a worn assembly, our prebuilt lower units ship directly to your door, ready for a straightforward install. No need to worry about sourcing individual parts or navigating complicated assembly steps.

Not sure if your lower unit needs replacing? If you're noticing propeller issues, strange noises, or a drop in performance from your Yamaha F115, it could be time for an upgrade. Water in the gear oil or persistent vibration are also telltale signs something’s wrong. Fortunately, our OEM lower units are designed for long-term durability, making them a smart investment for serious boaters.

What does the lower unit on an outboard motor do?

The lower unit on an outboard motor like the Yamaha F115 transfers engine power to the propeller. It turns the vertical motion of the driveshaft into horizontal propulsion, pushing your boat forward. It also houses vital parts like the gearcase, water pump, and prop shaft. Damage here can directly impact speed, fuel efficiency, and engine longevity.

How do I know if the lower unit on my Yamaha F115 is failing?

Common signs of lower unit failure include excessive vibration, difficulty getting up to speed, grinding or knocking noises, milky gear oil (a sign of water contamination), and visible damage or cracks. If any of these show up, it’s best to stop running your outboard and inspect the lower unit right away.

Can I install a Yamaha F115 lower unit myself?

Yes, many experienced boaters choose to handle the install themselves. Our Yamaha F115 OEM lower units come preassembled, so there's no need to build the gearcase from scratch. If you have marine tools, access to a service manual, and know your torque specs, the process is straightforward. Of course, you can always have a marine mechanic handle the installation if preferred.

TL;DR

The lower unit on a Yamaha F115 outboard delivers power from the engine to the propeller. If yours is damaged or worn, YamahaOnlineParts.com offers OEM lower units that arrive fully assembled and ready to install, helping you protect your engine and restore smooth performance.

Ready to upgrade your Yamaha F115 lower unit? Order today for fast shipping and long-lasting OEM reliability. Have questions? Our team is here to help you choose the right fit for your outboard.