An outboard bogging down is one of the biggest challenges a boat operator encounters.
When it occurs, the performance of the outboard motor will be very poor.
When this occurs it is usually a power generation problem from the engine of the outboard motor.
This is one of the reasons why Yamaha 2 stroke outboard bogs down at full Throttle.
Yamaha 2 stroke outboard motor loses power if it has problems like faulty carburettor, bad fuel to oil mix ratio, use of contaminated fuel, bad fuel line, fouled plug, bad ignition coil and overheating.
when any of these problems occur in the two stroke Yamaha outboard motor, it will drastically reduce the power output of the outboard motor.
Due to this, the outboard motor will struggle to maintain performance especially when it is accelerating under load.
Why Yamaha 2 Stroke Outboard Loses Power At Full Speed With Solutions
1)Using Bad Fuel To Oil Mix Ratio
2 Stroke outboard motors give a good performance just like most four-stroke outboard motors.
One of the most distinctive common difference that exist between these two types of outboard motor is how oil is used to run the outboard motor.
In a four stroke outboard motor, there is a separate compartment in which oil is filled.
But when it comes to the use of a 2-stroke outboard motor, the oil has to be mixed with fuel before the fuel mixture is introduced into the fuel tank.
This is where one of the biggest problems of a 2-stroke outboard motor arises.
This has to do with the mix ratio that is made use of to run the 2 stroke outboard motor.
If you use too much oil in the fuel, you will have problems like smoking.
If you use less oil in the fuel, you will also have problems like engine knocking.
Each of these problems will always reduce the power production from the outboard motor.
With this lesser power production, the performance of the outboard motor will be reduced.
One of the ways this reduction in performance is going to show up is when you try to accelerate or throttle your 2-stroke outboard motor.
In such a scenario, what you will observe is that your outboard motor will be struggling to maintain a constant speed.
This will lead to bogging while it is accelerating or throttling.
That is why you have to make sure that you always use a good mix ratio when running your 2-stroke Yamaha outboard motor to avoid bogging when accelerating.
Solution
a)Use Good Fuel To Oil Mix Ratio
if you are constantly having problems in the performance of your 2-stroke Yamaha outboard motor, you have to check the fuel to oil mix ratio that you use.
One of the best mix ratios that you can use to optimise performance is the 50:1 mix ratio.
This simply means that for every 50 litres of fuel that you use, you have to mix it with 1 litre of oil.
This will help give your 2 stroke Yamaha outboard motor a good performance.
2) Faulty Carburetor
When a 2-stroke Yamaha outboard motor is not performing well, it is mostly related to a power loss issue.
But for power to be generated in a 2-stroke outboard motor, some components of the outboard motor play a vital role.
One of these components is the carburettor in this 2-stroke outboard motor.
This is because the carburettor regulates the volume of fuel that is being sent to the combustion chamber.
If the carburettor is faulty, then this will affect the volume of fuel that is being released by the carburettor to the combustion chamber.
Due to this, the combustion chamber will be starved of fuel for combustion.
Apart from starvation of the combustion chamber, a faulty carburettor can also be releasing excess volume of fuel to the combustion chamber.
This will easily lead to engine flooding which also reduces the performance of a 2-stroke yamaha outboard motor.
Solution
a)Rebuild Faulty Carburetor
When you discover that the carburettor used in your 2-stroke Yamaha outboard motor is not functioning well, you have to rebuild it.
In rebuilding the carburettor, you have to make sure that you purchase parts from a reliable supplier.
This will help in solving some rebuilding issues like compatibility issues.
If you discover that the float needle which is one of the components of a carburettor is stuck, you have to free it.
3) Use Of Bad Fuel
The quality of fuel used in running an outboard motor has a very huge role to play in the performance of the outboard motor.
If the fuel is of a good quality, then you will observe that your outboard motor will perform very well.
That is why you experience a great performance when you make use of premium fuel.
But if you use the poor quality fuel, then the performance of your outboard motor will suffer.
A poor-quality fuel can contain things like water and dissolved solute.
This will affect the volatility of the fuel and will affect combustion negatively when it is introduced into the combustion chamber by the carburettor.
Solution
a)Use Good Fuel
When running your outboard motor, you have to make sure that the quality of the fuel that you use is very good.
This will help your outboard motor to produce better performance effortlessly.
If the fuel in your outboard motor has stayed for too long without use, you have to make sure that you drain it and fill it with fresh fuel.
4) Faulty Fuel Line
Before fuel can be sent to the carburettor from the fuel tank, it has to pass through a channel.
This channel is the fuel line.
But sometimes the fuel line of the outboard motor can develop some faults.
This can be faults like the fuel line having a leakage.
When this occurs, the volume of fuel that the carburetor receives will be negatively affected.
With this, the performance of the outboard motor will reduce especially in situations where it needs more volume of fuel ylike when it is throttling or accelerating.
Solution
a)Replace Bad Fuel Line
When you discover that the fuel line in your 2-stroke Yamaha outboard motor is not functioning well you have to make sure that he replace it.
In being replaced, you have to make sure that it is a genuine one.
This will help your outboard motor to perform well and avoid loss of fuel through leakage.
5) Fouled Spark Plug
One of the problems you likely encounter when using a 2-stroke Yamaha outboard motor is fouled spark plug.
This is simply the coverage of the spark plug tip by oil or carbon.
One of the reasons that leads to this in a 2-stroke Yamaha outboard motor is when there is too much oil in the fuel mixture.
Too much oil in the fuel mixture will always lead to incomplete combustion in the combustion chamber.
This will give room for the production of more smoke instead of more power from the outboard motor.
With this the Smoke that is produced will cover up the tip of the spark plug.
This will affect the ignition of the fuel mixture in the combustion chamber by the spark plug.
As a result of this, the performance of the two stroke Yamaha outboard motor while throttling will reduce.
Solution
a)Use Good Fuel To Oil Mix Ratio
The combustion chamber is supposed to perform effortlessly without accumulating a lot of carbon.
But for this to happen, the ratio of the fuel to oil mixture must be good.
If oil is too much in the fuel mixture, incomplete combustion will always take place.
Due to this, a lot of carbon will be produced.
Most of these carbon will be sent out as smoke through the exhaust pipe.
But some of the carbon will remain in the combustion chamber which will cause fouling of the spark plug.
This drastically reduces the power generated from the 2 stroke outboard motor engine.
To correct this, you have to make sure that you use the right fuel to oil mix ratio which is 50:1.
b) Decarbonate Fouled Spark Plug
It is always very important to make sure that you perform timely maintenance on your outboard motor that is two stroke.
One of the things that you are supposed to check is the quality of the spark plug in the 2-stroke outboard motor.
If you discover that the spark plug has been highly covered with carbon you have to make sure that you remove the cabon.
This can be done by rinsing the outboard motor spark plug in fuel and then leaving it to dry completely before introducing it back into the 2-stroke outboard motor.
6) Faulty Ignition Coil
Ignition coil plays a very vital role in the performance of an outboard motor.
This is because it acts as a transformer in delivering a sufficient charge to the spark plug.
With this, the spark plug is able to easily ignite the fuel mixture in the combustion chamber.
But if the ignition coil is bad, then the spark plug will not receive the correct amount of voltage it needs to ignite the fuel mixture.
When this occurs, the performance of the two stroke Yamaha outboard motor will reduce.
This is one of the reasons why Yamaha 2 stroke outboard motor bogs down at full speed.
Solution
a)Replace Faulty Ignition Coil
When you discover that the ignition coil in your outboard motor is bad, you have to make sure that you replace it.
In replacing it, you have to make sure that you replace it with the right capacity.
This will help in ensuring that the combustion of fuel mixture in the combustion chamber is efficient.
With this, your 2-stroke Yamaha outboard motor will be able to produce good performance.
7) Bad Exhaust System
The exhaust system plays a role when it comes to the performance of a 2-stroke outboard motor.
This is because after the ignition of the fuel mixture in the combustion chamber there are always by-products after combustion.
These by-products are easily sent out through the exhaust system.
But if the exhaust system is not functioning well like being blocked, then the byproducts will not be able to be sent out after combustion has taken place.
This will drastically reduce the performance of the two stroke Yamaha outboard motor and can easily lead to worst scenarios like overheating.
Solution
a)Fix Faulty Exhaust System
When you discover that the exhaust system of your 2-stroke Yamaha outboard motor is not functioning well, you have to make sure that you fix it.
This will help you achieve better performance when using your 2-stroke Yamaha outboard motor.
But before performing the fix, you have to make sure that you troubleshoot an outboard motor very well.
This will help in showing you the exact problem that is causing the malfunctioning of the exhaust system.
8) Bad Air Filter
One combustion to take place in the combustion chamber, a quality amount of good air is always needed.
This is why there is an air filter in the outboard motor.
This helps in making the quality of air that is sent into the combustion chamber good and not contaminated.
But if this air filter gets bad or clogged with dirt, then it will restrict the volume of air that is being sent to the combustion chamber.
This will affect the efficiency of combustion in the combustion chamber.
With this, less power will be produced from the outboard motor.
Solution
a)Use Good Air Filter
When making use of your 2-stroke Yamaha outboard motor, you have to make sure that the air filter in it is good.
This will help in delivering good quality of air to the combustion chamber for efficient ignition of the fuel mixture to take place.
Further Readings
Why Yamaha 115 Outboard loses Power At Full Throttle
Why Evinrude Outboard Is Not Running At Full Speed