Hooking up a hose to your Sea-Doo watercraft vehicle is an important step in flushing out the engine. Any time you take your Sea-Doo out into salt water, you'll want to flush the engine out afterwards with fresh water to prevent the salt water from collecting and damaging the engine. This is especially important when you're about to place your Sea-Doo in storage for the winter months.
Unscrew your Sea-Doo's drain plugs.
Locate the Sea-Doo's water injection port by consulting your owner's manual. Depending on the model of your Sea-Doo, the port will likely be either in the rear back corner, inside the jet pump area or under the hood in the front of the vehicle.
Turn the water off to your garden hose. If you force water into the Sea-Doo with the engine off, it will cause hydro-lock.
Make sure that the vehicle's engine is off. Insert the head of the garden hose into the Sea-Doo's water injection port. The male connector of the garden hose will slide snugly into the female connector of the water injection port. A built-in seal on the water injection port prevents leakage. You shouldn't need to screw the connector shut or apply excessive pressure. If the connector sizes don't match, your Sea-Doo requires a flush kit adapter, which snaps onto the end of the garden hose and screws clockwise onto the water injection port.
Turn on the Sea-Doo's engine.
Turn the garden hose's water on to full strength. Continue running the engine for four to five minutes. This will flush all of the salt water out of the engine.
Turn the water off. Continue running the engine for a few more seconds until no more water expels out the back.
Turn off the Sea-Doo's engine and remove the garden hose from the water injection port.
Your Sea-Doo's Shop manual contains extra instructions for your specific model in the "Flushing and lubrication" area of the "Maintenance" section.
Let your Sea-Doo's engine cool down before flushing it.