How to Flush Saltwater from a Yamaha 4 Stroke Outboard

How to Flush Out a Yamaha 4 Stroke Outboard: I wanted to make to quick video just showing you how the dealer showed me how to flush saltwater out of my Yamaha 2014 150hp 4 stroke outboard motor. I when I got ready to come back home or once I got home and are going to put the boat up for a little while. I have the 2014 Sea Hunt 211 Ultra boat that take to the coast and do a lot of inshore and nearshore fishing and a lot of summer cruising out of. I hope this video will help you especially new boat owners with flushing out a 4 stroke Yamaha outboard motor. If your motor does not have this hose to flush out your motor you may need to use the muffs, but I would contact your boat dealer or boat marine specialist to be sure you are flushing your motor out correctly.

Here is a video of my boat and an overview of it:

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[AlexanderTheGrateful]

Well with all the conflicting arguments I’ll just add my 5c for what it’s worth,

After many years in the industry and looking into many Yamaha motors, we came across a motor that nearly immaculate inside and out. Water galleys clean as a whistle.

We asked the bloke what products he uses and the process of flushing etc,

He told us he has never used any products other than running the motor in a test tub while topping up the water to prevent overheating,

What we had discovered is that when the engine warms up to operating temp. It also heats up the water and increases it cleaning and steaming properties and also drying quicker due to the evaporation rate being increased with temperature,

This was a great shock to me and since seeing this I flush all my motors the same way now, take it with a grain of salt but evidence is evidence

[floridafunshinechannel]

Great video with great instructions. Respect. My preference is the Muffs because it allows the thermostats to open and flush entire system. Love the engine BTW.

[anthonybeard]

I see a lot of comments here that this method does not flush the entire motor. According to Yamaha it will. There are small bypass holes at the thermostats that will allow flushing of the entire motor. No need to run the engine. They recommend running the water for at least 10 minutes.

[joeritter]

Thanks for the video. No salt water here in mn but this worked awesome to flush muck out after a morning of duck hunting!

[scottnra]

Just tip #2 According to my dealer, if you do this with a cold motor the water is not going to flow through the passages that have the T-Stats Closed on them. You'll get most of the engine, but not all of it. It's best to either warm up the motor first or better yet (which requires muffs) or just flush from muffs and run it if you use your boat in saltwater. Also a good desalting solutions from an injector kit and muffs will clean better, in less time, and leave a protective coating on the interior of the motor.

[AlexRuddFishing]

I've always considered fishing intercostal with the skeeter just never wanted to have to flush the motor and all that. Good video bud.

[mdees]

This is a good way to flush your motor in a pinch or if kept on a lift. But it does not flush the entire motor. The Thermostat is closed when the motors off and water can not flow past it.

It is much better to flush with muffs. Crank the motor while flushing and let it come up to normal operating temperature so the thermostat opens. This ensures the entire cooling passage gets flushed.

[skunkedagain]

Great video, so simple on the Yamaha 4 stroke

[kendee]

Thanks, this worked great for my Yamaha 4 stroke.

[mikelaba]

Im in fresh water. But 20 minutes?! That seems crazy. Glad i boat in fresh water.

[jayschaefer]

Got a question
I have a Yamaha 4 stroke. Top flush also. Ear muffs won’t work since I’m on a well . Not enough pressure from the well to push through the motor so I just use top flush. I do realize the Thermostat won’t open without the engine running for the top flush so I bought a flush bag. Flush bag works good but it’s a pain to fill.
My question is if I remove the thermostat while using the top flush would that flush the whole system ?
Also I use saltaway but keep in mind if you flush using top flush only the the thermostat will gum up so keep it clean....
Great motor. Always keep the VST filter drained for water if using ethonal based fuel. Damn water phase separation will kill the engine.

[bobberdownfilms]

nice video, beast of a motor and boat, kinda jealous

[treydrier]

Make sure to flush it with Salt Away if you're in salt water. It removes the salt much better than regular H2O and provides corrosion protection. You flush for a couple minutes with regular H2O then Salt Away for another minute or so. Do not flush again with H2O after applying Salt Away because of the corrosion protection from Salt Away.

[rehaerman]

I also run the engine in neutral while flushing it this way. Is it bad to run the engine?

[henriknielsen]

Are you allowed to start it with that on?

[Jay-iqyh]

Do you flush with the engine tilted or down ??

[FLAman-jqrx]

Can you run it while you're doing this

[Pippinm]

Great vid !!! Thanks! I live in Jacksonville, FL and I’m looking for a pre-owned 18-24 foot boat with a Yamaha 150 on it. What kind of boat do you have? Thanks

[johnv]

Hi…. as a qualified automotive mechanic…I have been using 1 litter of engine coolant inhibitor right at the end of the flush on my outboard…which keeps all seals and aluminum housing lubricated at all times and keeps a film of anti-rust and anti-corrosion at all time…what is your thoughts on this ???

[krkabob]

Does that flush the lower unit as well?