How To Detect Exhaust Corrosion On Yamaha f225?

Although Yamaha Outboard motors represent higher durability and reliability, many consumers claimed severe troubleshooting issues especially, the exhaust corrosion issue with the Yamaha f series 225 models.

However, you can easily prevent those severe damages beforehand when you are well aware of the symptoms to detect exhaust corrosion.

Therefore, let’s learn how to detect exhaust corrosion on your Yamaha f225 and fix it:

What Signs For Exhaust Corrosion On Yamaha f225?

Identifying when your outboard is suffering from exhaust corrosion can be overwhelming since initially, you may not see any visible interior and exterior defects on your outboard.

But the most familiar and obvious sign of exhaust corrosion is when you experience loss of horsepower with your outboard engine.

What Are The Symptoms Of Exhaust Corrosion On Yamaha f225?

The symptoms that indicate exhaust corrosion on the Yamaha f225 outboard are usually similar to the following indications:

1. Loss Of Engine Horsepower:

Corrosion, in general, gets into any outboard internal or external exhaust components, which very obvious and unavoidable.

But the problem occurs when the quantity becomes excessive and starts damaging the components.

If you ever notice your outboard motor seems to lost horsepower and it is visibly struggling during the start, that is a significant indication of excessive corrosion into the internal exhaust components.

2. Overheating, Smoking, And Eventually, Engine Failure:

When your exhaust component coating is not up to the standard or is defective, it lets the hot gases get into the exhaust passages and corrode them.

This commotion ultimately creates holes in the exhaust passages, which eventually causes overheating, white or black smoke exposure, and instant engine failure.

This mainly happens because of the lack of attention from the manufacturer during the designing and coating of the outboard model.

3. Engine Idles, Oil Bubbles Up Or Leaks:

When your outboard has excessive internal corrosion in the internal exhaust component, you will notice that the outboard engine is frequently idling.

Even when you have set the engine in neutral, you will see excessive air bubbling from the exhaust.

Besides that, some consumers also experience oil leakage or bubbling up in the exhaust, and these are the clear indication that your Yamaha outboard requires an instant thorough inspection to fix it.

These are major symptoms to identify whether your Yamaha f225 outboard has exhaust corrosion or not, and if you experience or encounter any of them, make sure to act quickly and fix the problem as soon as possible.

How Should You React?

If your Yamaha f225 outboard motor has gotten severely damaged by exhaust corrosion, here are the few things you can try to fix the excessive exhaust corrosion issue on your Yamaha outboard:

Spray With Salt Off & Garden Mixer:

You can spray down the interior parts, including the clean-out port, plug, and hull, using the Salt Off solution.

You can also add a garden mixer to the end of the hose to remove the salt from the interior and exterior exhaust units.

Flushing The Outboard Engine:

After you have finished spraying, it is time to take care of your engine. Now flush the entire engine with Salt Off solution for at least fifteen minutes.

Better to flush the engine after each outing because Yamaha strongly recommends flushing the engine each time you come from around down trip.

Clean Your Outboard With Wax:

Since you have flushed your engine, now you need to clean your entire outboard body with a good Wax soap like Griots or Meguiars.

You will require a soft brush to rub and wash your outboard. After that, properly rinse and use microfiber towels to dry your Yamaha outboard.

Spray-On The Electrical Components:

To avoid extreme corrosion, spray Yamaha silicon spray or Corrosion-X on your outboard motor and all electrical components.

If you notice any sign of rust in hardware during this, you should also spray The Must For Rust on that particular area.

Polishing The Outboard Hull:

Since the corrosion problem on Yamaha f225 primarily arises because of the uneven coating and polishing, you can prevent the problem by polishing and waxing the hull with a synthetic paint sealant like the Griot’s One Step.

For the polishing and waxing job, you can use a medium-cut pad. But when polishing around the interior surfaces, use the Griot’s Poly Wax with your hand.

Rebuild Or Replace The Exhaust System:

After finishing a thorough inspection on your outboard internal and external exhaust system, if you find that the exhaust system has been damaged severely, there is only one solution left then.

That is either rebuilding or replacing the entire exhaust system of your Outboard. For this task, you will require an expert’s help because it is an advanced technical job.

So, you should contact the nearest servicing center or hire a professional for this task.

Is Fixing Yamaha f225 Exhaust Corrosion Typically Expensive?

Technically, repairing and fixing costs vary depending on the level of damages and labor hours required to fix that. You do not have to worry about the expense of cleaning, flushing, and maintenance tasks because those are relatively affordable.

But when you have to replace or repair the Yamaha f225 model, it can be expensive. Since the necessary repairing kit that Yamaha suggests for their product lines is available at around $650. If you consider the labor cost, it can reach a margin of $2,500 in the worst scenario.

How Often Should You Check Your Yamaha f225 For Exhaust Corrosion?

The best way to avoid any excessive corrosion problem is to flush the outboard motor after every trip with fresh and clean water for at least 15 minutes.

Flushing helps the cooling system run at maximum efficiency by holding the cooling water passages clear and clean.

According to Yamaha, you should clean and flush your motor after each use with plenty of freshwaters.


As I have already mentioned, sometimes it is hard for ordinary users to figure out when their outboard has internal or external exhaust corrosion, and that is the main culprit of their engine failure. That is why they need a proper heads-up about the exhaust corrosion symptoms.

So that when they cannot figure out any other visible issue they can inspect their outboard inside out to determine whether it’s because of the excessive exhaust corrosion or not.

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