On-Water Maintenance: How to Flush Your Outboard Motor

While you’re out and about on the water, the last thing you want is salt and debris hanging around inside your outboard. But you don’t need to wait until you get back to shore to flush things out. You can quickly flush through your motor’s built-in port while you’re still out enjoying the day’s activities.

Tools & Prep

Before taking your boat out, make sure you have:

• Clean freshwater (in jugs or a tank)
• Funnel
• Short hose (if using a tank)
• A towel or rag
• Owner’s manual

Flushing Instructions

Locate Your Flush Port

Different brands have different flush systems. Check your manual for the designated flush port (it’s usually a screw-on cap near the powerhead).

Secure the Boat

Make sure the engine is off, and the gear is in neutral.

Use Portable Freshwater

If you’re using fresh water, you can pour the water directly into the flushing port using a funnel. Alternatively, you can attach a short hose to a portable tank if your setup allows. 

Rinse Thoroughly

Let the water run for 5–10 minutes. You should see clean water draining from the lower unit when it’s all flushed out.

While this method helps reduce salt and debris buildup, this shouldn’t be a full replacement for flushing on land. Still, doing it consistently after each exposure to saltwater helps protect internal components from corrosion.

Have questions about your outboard’s flush system? Reach out to our team today.