4 Fixes For Yamaha Outboard Clogged Cooling System

yamaha outboard clogged cooling system
yamaha outboard clogged cooling system

Among brands like Mercury and Evinrude, Yamaha has also established itself quite nicely as a reliable option. While this unit might lack in fuel economy, you won’t have to ever worry about a lack of power from this option.

So, if you’re looking for a unit for a bigger boat, then going with Yamaha is a smart decision.

Yet, that doesn’t mean that you will be able to save cash on this purchase. You’ll have to understand that premium performance comes at a premium cost, and you’ll have to manage your budget accordingly.

Now the point of focus here is that you can’t only sit on an amazing outboard and expect every problem to sort itself out.

Instead, you need to look for methods to maintain the performance of the outboard. Otherwise, you will just drag yourself down. 

Recently some issues on Yamaha Outboard Clogged cooling systems have troubled many owners.

Luckily, this issue is not that severe and can be fixed rather easily. So, if you’re stuck in a similar situation with Yamaha outboard cooling system, try to follow these methods.

Yamaha Outboard Clogged Cooling System

  1. Try Vinegar Flush

In a situation where the Yamaha outboard is running into clogging issues with the cooling system, your best bet is the diluted vinegar solution.

The excessive rust build-up in the pathway can lead to this issue. So, if you’ve not serviced the unit in a long time, there is a good chance you’re in a similar situation.

You can either use any cleaner from the market or rely on vinegar flush to get everything fixed. Once all the gunk is out of the valves, your outboard will start to function perfectly.

Now, the question that most people ask here is whether or not this will damage the cooling system. The simple answer here is “No.” Using vinegar to flush out the gunk and to unclog the system will not be that bad of an idea. 

However, you can still expect some residue after you’re done flushing the system. Dealing with this residue will not be a complicated job, but you’ll be able to do it fairly quickly if you flush out the residue with water one more time.

All that you’re trying to do is to use the vinegar to flush out the gunk and then use water to clean up the residue.


While this might seem complicated, it will not take you much time, and you will be sorted out with the perfect cooling system.

From there, you can pass that cleaner through the cooling system, and that should be enough. You won’t have to worry about any hardware issues or other problems when relying on this solution. 

  1. Use Garden Hose

Sometimes, the simple use of a garden hose can remove extra gunk from the setup.

It won’t take much of your time, and passing water through the system will eliminate the majority of clogging issues. Just make sure that the pressure of the garden hose is optimal.

However, too much pressure can also compress the gunk in the system. So, start slow and work your way up through the system. That way, all the gunk will be removed, and the system will start working perfectly.

If you’re still skeptical about using just water, there are several cleaning agents and solutions that you can purchase from your local market.

These solutions will help you break down the gunk and remove it from the cooling system without putting too much pressure on it. 

Just make sure to not go cheap and choose a reliable brand. That way, you will not be surprised with the final results, and it will be easier to figure out a suitable fix for the cooling system.

Similarly, you can also engage the dealer or the customer support professionals. This brand maintains a complete panel of experts to help out the customers in case of any issues.

So, there is no point in trying out your luck without getting help. 

All that you will need to do is to reach out and explain your end. From there, the experts will be more than happy to take charge and address the situation.

Hopefully, you will not have to deal with the same issues, and fixing the unit will come easily to you. So, be sure to reach out and ask for help. 

  1. Use Wire

If the gunk is visible through the water outlet and the pressure from the garden hose is not enough to remove it from the system, then relying on a piece of strong wire should help you remove the gunk from the system.


This is not a complete solution, and you will eventually need to pass a market cleaner through the system. Some owners also mention that you can damage the cooling system if you keep poking wires through it. 

However, if you’re being careful and just want to get rid of some lodged gunk, then you can test out your luck.

Still, the better thing would be to rely on a suitable cleaner from the market and use that to clean up the system. That way, you will not be bothered with the final results. 

  1. Hire an Expert

If the problem is not fixed even after trying out all of these fixes, then the valves in your unit are likely damaged.

To better isolate the issue with your Yamaha outboard, it would serve you well to hire an expert.

It is true that the repair cost can be a bit expensive, but if you ignore this issue, the after-effects will be quite destructive.

So, either call your dealer or engage Yamaha customer support to help you through this issue. Hopefully, your problem will be fixed in no time.

try support

There is no point in trying to hassle with the system on your own. Instead, you need to always rely on the officials that are ready to help you out.

The only thing that you need to do is to provide them with a clear description of the issue. From there, these experts will take charge of the situation. 

Yes, it will take time for the customer support team to respond at first, but you’re not left with many options at this point.

There might just be hardware issues, and you can’t fix those on your own. So, be sure to reach out to the officials and have them help you out. 

Wrapping Up

Annoyed with the Yamaha outboard clogged cooling system? Try the methods we’ve listed here.

Most often than not, you’ll be able to flush out the gunk by using vinegar. So, be sure to start out with that method and go about addressing the situation accordingly.

It will not take you as much time to address the errors if you’re a bit aware of the basic maintenance cycle.

This problem with the cooling system getting clogged will present itself after you ignore the maintenance for weeks on end. 

For this reason we always stress the fact that you need to start out with the basic maintenance cycles and clean up the outboard as well as you can every week.

This might seem like a hassle at first, but the improvement in the lifespan as well as the performance of your outboard will be much better.

Lastly, you can just call it a day and get help from the official support team. There is no point in trying to fix everything on your own when you can get the experts to chime in.

These professionals will make your life much easier, and you will not have to hassle as much with a fix. 

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