3 Most Common Problems With Yamaha 115 4 Stroke

The Yamaha 115 4 stroke outboard motor model serves with outstanding performance, reliability, and power. 

Besides being such an excellent choice for fishing boat lovers, it still has some common issues that most users have encountered. 

In today’s article, I will help you to get an in-depth grip on those most common problems that you might encounter while using the Yamaha 115 4 stroke motor in the future. 

Starter Does Not Engage Or Turn OverFaulty or damaged electric system caused by blown fuseDamaged or dead battery
Engine Struggles During Starting   Low fuel level or existing leakage inside the fuel tankExcess engine oilCracked or burned Spark plugs
Unusual Vibration Or NoisesDamaged parts of the propeller system or bad propellerLoose connection

3 Common Yamaha 115 4 Stroke Problems:

1. Starter Does Not Engage Or Turn Over:  

The first common trouble most consumers mention with Yamaha 115 4 stroke engine is the starter failure issue. 

Yamaha 115 4 stroke users often complain about starter issues like it might not engaging properly or failing to turn over. Some users even particularly pointed that the motor struggle to crank.  

This type of problem can occur because of the faulty electric system or if your fuss got blown off. It can also cause by a damaged battery.

Therefore, to confirm the core reason, you need to do a thorough investigation.

Possible Fix 

There are some easy steps that you can use to solve when you encounter a similar troubleshooting issue with your Yamaha 4 stroke outboard motor. 

This commotion may occur because of the faulty electric system caused by the blown fuse… 

Therefore, the first task will be checking the main fuse of your Yamaha 115 motor to ensure whether it is okay or blown. 

You can start the inspection by unscrewing all the connectors to remove the main electric cover. Then, you need to remove the fuse holder by using a plier pair. 

Now, you have clear view access to check whether the center connection of the fuse is damaged or not. If it is cracked or damaged, you must replace the existing fuse with a new one. 

Take help from your outboard service manual to find the accurate amperage that will match your outboard model. 

A damaged or dead battery can also cause such trouble… 

To check or inspect the battery condition, safely disconnect the negative cable first. Then, disconnect the positive cable to remove the battery from the housing. 

If the battery is already damaged replace it. If it does not seem broken, charge the battery accurately before re-installing it. 

However, you should also check the battery terminals for existing debris or corrosion and use a wire bristle brush to remove those. 

Remember to take your time to clean all the built-up corrosion. You can either use a debris cleaning solution or baking soda and water mixture to clean.  

Also, do not forget to dry all the terminals with a towel after cleaning.

2. Engine Struggles During Starting: 

Another commonly experienced problem with the Yamaha 115 outboard engine is when the engine struggles to start.  

Technically speaking, this is not an issue you will only encounter with the Yamaha 115 4 stroke outboard or boat motor. 

Still, often users claim that their Yamaha 115 outboard engine gradually stops running smoothly like usual, and they notice the engine’s visible struggles when they try to start it. 

Honestly, it happens with almost all vehicle engines, especially when your motor gets old or if your outboard motor does not get the regular schedule servicing.

Possible Fix

Let’s find out the possible reasons that cause this issue and how to fix this troubleshooting problem.  

It can occur because of the low fuel level or any leakage inside the fuel tank… 

If that is the case, you first need to check your outboard fuel system, and if the fuel level is not full re-fill the fuel to the maximum level. 

While refilling your fuel tank, make sure you are filling it with the accurate fuel type. 

Next, you need to inspect your fuel tank for any leakage that might cause the problem. First, check the fuel lines that connect the fuel tank with your outboard motor. 

As soon you find any leaks or breaks in there, stop your outboard motor. Then contact an expert or professional mechanic to fix the fuel tank issue. 

Excess engine oil can lead your outboard engine to fail… 

Therefore, you should check the level of your outboard engine oil. First, you need to remove the filter cap and dipstick. Then, wipe that dipstick with a clean towel and reinsert it. 

Now check the oil level mark on the dipstick, if the mark is indicating above “H”, that means you must remove the excess oil. 

But if it indicates below “L”, you need to refill the engine oil.  

Another possible reason behind this can be the cracked or burned Spark plugs… 

To investigate the condition of spark plugs, use a spark plug wrench to remove them safely. If those plugs look damaged or burned, you need to replace them with new ones. 

Before the replacement task, remember to take the spark plug gaps measurement.  

Also, cross-check the spark plug specification with your outboard user manual information.

3. Unusual Vibration Or Noises: 

Another most familiar troubleshooting issue with the Yamaha 115 4 stroke outboard engine is the unusual or unfamiliar vibrating noise coming from the motor. 

Users have experienced that their engine suddenly makes excessive vibrating sounds.  

It can happen with any other outboard or boat motors too. Especially if the outboard motor becomes older and lacks the required daily maintenance, this type of problem can arise. 

However, it does not mean that you should not learn the possible reasons behind this problem and look for easy fixing solutions.   

So, let’s learn the details together.

Possible Fix 

A bad propeller or any damaged parts of the propeller system can cause excessive noise and vibration. 

The first and foremost task is to inspect the entire propeller system whenever you notice excessive noises coming from your Yamaha 115 motor. 

If you notice any damage, leak, or cracks while checking, you should remove the part and replace it. 

Next, you need to investigate the condition of the propeller shaft, and if you notice any kind of cracks or leaks there, repair or replace it. 

You also need to inspect whether any seaweed or other detritus is stuck or entangled in there. If so, then clean and remove all build-up debris from there. 

Loose connection can cause such noises… 

Therefore, thoroughly check all the connectors, bolts, screws, and terminals that are connected directly with the engine. 

Tighten the connections, if needed, and again try to start your engine to check.

What The Majority of Users Feel About the Yamaha 115 4 stroke?

There is no doubt that Yamaha offers one of the most impressive and long-running outboard motors with its 4-stroke outboard motor lineups. 

Yamaha 115 4 stroke outboard engine offers the fastest 115 horsepower and almost 51 mph speed which is the top speed level you can ask from an outboard motor. That’s why most consumers are satisfied with the performance they are getting from this model. 

Regarding the troubleshooting experiences that may arise with Yamaha 115 outboard engines, consumers are also satisfied with the fact that Yamaha provides great after-sale customer service through dealers.

Final Thoughts:

Yamaha is one of the legendary industry leaders in blending innovation with technology, especially for outboard and boat engine production. 

Some users often complain about the weight of the Yamaha 115 4 stroke outboard motor, but the reliability, fuel economy, quiet operation option, high power, and speed this particular model delivers that undeniably impressive. 

Besides, all the common problem with this Yamaha motor is easily fixable so, there is no need to worry about.

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