Yamaha 115 4 Stroke Problems: Solutions You Need To Know

The Yamaha 115 4-stroke is a popular outboard motor on many boats. While it is generally reliable, there have been some reported problems with this motor over the years.

These issues can range from minor annoyances to major malfunctions that require professional repair. It is important for boat owners to be aware of these potential problems and to take steps to prevent them from occurring.

Here we’ll explore the common Yamaha 115 4-stroke engine problems and potential solutions to fix them. We’ll also discuss Yamaha 115 4 stroke problems and offer tips for preventing them in the future. Keep reading to learn how to keep your Yamaha engine running smoothly on all your boating adventures.

8 Yamaha 115 4 Stroke Problems And Solutions

8 Yamaha 115 4 Stroke Problems And Solutions

Yamaha 115 4-stroke engines are known for their reliability and durability, but like any mechanical system, they can experience problems from time to time. Yamaha 115 4-stroke engines are known for their reliability and durability, but like any mechanical component, they can experience issues from time to time.

Some common problems that Yamaha 115 4 stroke problems owners may face include overheating, stalling, and losing power. Several solutions to these issues can help keep your engine running smoothly.

1.Faulty Head Gasket

Faulty Head Gasket

The Yamaha 115 4-stroke engine is reliable and high-performing, but it can still experience issues, such as a faulty head gasket. Owners need to be aware of the signs, like engine overheating, white smoke from the exhaust, and loss of power.

Prompt attention is crucial to prevent further complications. Carbon buildup is a common issue faced by Yamaha 115 4-stroke engines. Air pressure plays a crucial role in properly functioning a Yamaha 115 4 Stroke engine.

2.Bad Fuel Pump

Bad Fuel Pump

One common issue that Yamaha 115 4-stroke owners may encounter is a bad fuel pump, which can disrupt fuel flow, leading to performance problems and potential breakdowns. Symptoms of a faulty fuel lines lift pump include engine misfires, difficulty starting, reduced power, and stalling.

Solutions include having the pump repaired or rebuilt by a technician or replacing it entirely. Another alternative is upgrading to a higher-quality fuel hose pump offered by Yamaha. Proper battery connections are crucial for the smooth operation of a Yamaha 115 4-stroke engine.

3.Clogged Fuel Injectors

Clogged Fuel Injectors

Clogged fuel injectors can negatively impact the engine’s performance, reducing power, rough idling, and decreased fuel efficiency. Regular maintenance practices, such as entire fuel stabilizer system cleanings and using high-quality fuel additives, can help prevent this issue.

These additives dissolve deposits and prevent build-up, ensuring clean and properly functioning fuel injectors. If clogged injectors are already causing problems, options include using a fuel injector cleaning kit or seeking assistance from a certified Yamaha technician with the expertise and specialized tools to diagnose and fix the issue. The fuel tank of the Yamaha 115 4 Stroke can sometimes experience problems.

4.Clogged VST Filter

Clogged VST Filter

A clogged vent tank filter is a common issue with Yamaha 115 4-stroke outboard engines. The VST, or Vapor Separator Tank, delivers clean and efficient fuel to the engine. However, as time goes on, the VST filter can become blocked, resulting in decreased performance.

Symptoms of a clogged VST filter include reduced fuel flow, rough running, stalling, and difficulty starting the engine. Regular maintenance and inspection of the VST fuel filter are necessary to prevent these issues. Cleaning or replacing the filter as needed will help maintain proper fuel flow and ensure optimal engine performance. It is important to follow the manufacturer’s guidelines for maintenance.

5.Trim and Tilt Problems

Trim and tilt problems with the Yamaha 115 4-stroke engine can frustrate boat motor owners. It’s important to address these issues promptly for smooth operation. One common problem is the motor failing to move properly, caused by a faulty pump, motor, or switch.

Check hydraulic fluid levels and inspect the motor and switch for damage. Simple adjustments or replacements may solve the issue. Another problem is that the engine trim is not positioned, possibly due to a leaking cylinder or worn components.

Regular maintenance is key to avoiding these problems. Carbon build-up is a common issue in Yamaha 115 4-stroke engines. The Boat Repair Expert specializes in repairing Yamaha 115 4-stroke engine problems.

6.The Engine Fails To Start

The Engine Fails To Start

If you are experiencing difficulty starting your Yamaha 115 4-stroke engine, there are a few potential solutions to try before seeking professional help. First, check the battery voltage and make sure it is fully charged. If the battery is low, it may not have enough power to start the engine. Next, check the fuel supply and ensure enough fuel is in the gas tank.

If the fuel level is low, add more fuel and try starting the engine again. If neither of these solutions works, check the spark plugs and ensure they are clean and properly gapped. Finally, if all else fails, it may be necessary to seek professional help from a Yamaha mechanic who can diagnose and repair any underlying issues with your engine.

7.Overheating Issues

Overheating Issues

If you are experiencing overheating issues with your Yamaha 115 4 strokes, there are a few potential causes and solutions to consider. One common cause of overheating is a clogged water intake screen or water pump. Try cleaning the screen or replacing the water pump to remedy this. Another possible cause is a faulty thermostat regulating the engine’s temperature.

If the thermostat is not functioning properly, it may need to be replaced. Finally, low oil levels can also lead to overheating. Regularly check and maintain your oil levels to prevent this issue. If none of these solutions works, it may be best to consult a professional mechanic who can diagnose and repair any underlying problems with your Yamaha 115 4-stroke engine.

8.Difficulty In Shifting Gears

If you’re experiencing difficulty shifting gears on your Yamaha 115 4-stroke motor, don’t panic. This is a common problem that various factors can cause. One possible solution is to check the shift linkage and ensure it is properly adjusted. If the linkage is loose or misaligned, it can cause problems with shifting. Another potential issue could be the oil level in your motor’s lower unit.

If the oil level is low, it can cause difficulties with shifting. It is important to have a qualified technician inspect and diagnose any issues with your Yamaha 115 4-stroke motor and repair it. Pressure fuel pumps are an essential component of Yamaha 115 4-stroke engines.

Is a Yamaha 115 4-Stroke a Good Engine?

Is a Yamaha 115 4-Stroke a Good Engine

The Yamaha 115 4-stroke engine is a reliable and efficient choice for marine mechanic enthusiasts. Advanced fuel injection technology offers excellent fuel economy for longer trips. It also provides impressive power output and smooth acceleration, ensuring consistent performance at high speeds.

Built with high-quality components and tested rigorously, the Yamaha 115 4-stroke engine is built to last. The thread on Yamaha 115 4-stroke problems has been quite informative. Valve” refers to a mechanical device used in various engines and machines to control the flow of fluids or gases.


While the Yamaha 115 4-stroke engine is a reliable and popular choice for many boaters, there have been reported issues with this engine. These problems can range from overheating to fuel system malfunctions.

It is important for bass boat owners to properly maintain their engines and address any issues as soon as they arise to prevent further damage Yamaha 115 4 stroke problems can be frustrating for any boat owner. But, with the right knowledge and care, most issues can be easily resolved.

Regular maintenance and the use of high-quality fuel and oil are key to preventing these problems from occurring in the first place. If you encounter an issue, it’s important to address it promptly and correctly by following the potential solutions here. By doing so, you can ensure that your Yamaha 115 4-stroke engine runs smoothly for years.


How Many Hours Will A Yamaha 115 Four-Stroke Last?

The lifespan of a Yamaha 115 four-stroke engine can vary depending on various factors. However, with proper care and regular maintenance, these engines are not uncommon to last for thousands of hours.

What Is The Top Speed Of The Yamaha 115 4-Stroke?

The top speed of the Yamaha 115 4-stroke can vary depending on several factors, such as boat size, weight, and water conditions. However, on average, the Yamaha 115 4-stroke has a top speed of around 40-45 miles per hour.

How Much Fuel Does A Yamaha 115 Burn?

The fuel consumption of a Yamaha 115 outboard engine can vary depending on factors such as boat weight, speed, and sea conditions. It can consume around 8-10 gallons per hour at full throttle.

How Heavy Is A Yamaha 115?

The weight of a Yamaha 115 varies depending on the specific model and configuration. However, on average, a Yamaha 115 outboard motor weighs around 377 pounds.

How Many Cylinders Is A Yamaha 115?

The Yamaha 115 has 4 cylinders. The Yamaha 115 is a powerful and reliable outboard motor that has been a favourite among boaters for decades.

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