How to Flush Your Yamaha Outboard with a Garden Hose: Flush Adapter Guide

Every time you run your outboard in saltwater or dirty water, it pulls that water through its cooling system. When you pull the boat out, some of it stays behind. Over time, salt crystals, sand and silt can build up in the water passages, restricting flow and contributing to overheating and corrosion.

A freshwater flush after each trip is one of the simplest and cheapest things you can do to look after your motor. Many Yamaha outboards have a built-in flush port, so flushing is as easy as connecting a garden hose. That's where a flush adapter comes in.

The FNQI-3D Yamaha Outboard Flush Adapter

Our Yamaha Outboard Flush Adapter (2 Pack) connects a standard garden hose fitting directly to the Yamaha flush port, so you can flush your motor with fresh water without muffs or extra gear.

• Designed for Yamaha outboard flush ports
• Connects a standard garden hose fitting straight to the flush port
• 3D printed from ASA, a UV, heat and weather resistant material suited to marine use
• Longer stem for easier fitting
• No tools required
• Pack of 2, so you can keep one in the boat and one at home
• Free postage within Australia
• Australian made in Far North Queensland by FNQI-3D

How to flush your outboard with the adapter

1. Check your owner's manual first. Flushing procedures vary between Yamaha models, including whether the motor should be tilted up or down and how long to flush for.
2. Connect the adapter to your garden hose fitting.
3. Fit the adapter to the flush port on your outboard.
4. Turn the water on and let fresh water run through the cooling system for the time recommended in your manual.
5. Turn the water off, remove the adapter and refit the flush port cap.

Most Yamaha manuals that cover the flush port say not to run the engine while flushing through the port. Always follow the instructions for your specific motor.

Tips for getting the most out of flushing

• Flush after every saltwater trip. The sooner you flush after retrieving the boat, the less time salt has to dry and crystallise inside the motor.
• Don't forget dirty freshwater. Muddy creeks and rivers can leave silt in the cooling passages too.
• Rinse the outside as well. A quick hose-down of the leg, cowl and trailer helps reduce corrosion on the outside.
• Keep a spare adapter in the boat. That's why they come in a 2 pack: one for the ramp, one for home.
• Replace the flush port cap. Always refit the cap before you next run the motor.

FAQ

Will it fit my outboard?
It's designed for Yamaha outboards that have a flush port. Check your motor has one before ordering, or message us with a photo and we'll help you check.

What hose do I need?
Any garden hose with a standard click-on hose fitting.

Will it hold up in the sun and salt?
It's 3D printed from ASA, a material chosen for its UV, heat and weather resistance in outdoor and marine conditions.

How many do I get?
Two flush adapters per pack.

Is postage free?
Yes, postage is free within Australia.

Where is it made?
It's designed and 3D printed in Far North Queensland by FNQI-3D.

Shop the Yamaha Outboard Flush Adapter (2 Pack) →

Yamaha® is a registered trademark of its owner and is referenced only to identify compatibility. FNQI-3D's flush adapter is an aftermarket product and is not affiliated with or endorsed by the trademark owner.