The 4 stroke mercury 9.9 is one of the mercury outboard models that withnessed Petronage from users.
But it can develope some issues within its service period.
Such includes the mercury 9.9 4 stroke starting problems.
Some of the causes of mercury 9.9 four stroke starting issues include clogged carburetor, bad spark plug, use of bad fuel, stuck carburetor float and bad stator.
When these problems occur, it will prevent your mercury four stroke from starting.
In this guide, you are going to learn of how to solve it anytime it occurs.
Causes Of Mercury 9.9 4 Stroke Starting Problems And How To Fix
1) Bad Spark Plug
When it comes to the smooth running of a gasoline engine, the spark plug plays a vital role.
This is because for an engine to generate power, there have to be combustion.
This is what will generates the force in the cylinder to produce power.
But before combustion can take place, the fuel in the combustion chamber has to be ignited.
For the ignition of fuel to take place, there must be an agent that will help with that.
This is where the spark plug comes in.
The spark plug helps in producing a spark that helps in burning the fuel in the combustion chamber.
With this, the outboard motor will be able to start.
But if the spark plug is bad, it will not be able to ignite the fuel in the combustion chamber.
Due to this, your mercury 9.9 4 stroke outboard motor will not start.
Solution
a) Use a Good Spark Plug
When you discover that the spark plug in your outboard motor is bad, you have to replace it with a good one.
This will help fix issues like the inability of your outboard motor to start.
2) Bad Stator
Before a charge is supplied to the spark plug, it has to originate from somewhere.
The stator helps in converting the rotating magnetic field into an electric charge.
This is how the spark that reaches the spark plug for combustion is created in an outboard motor.
But if this part has a problem, then there will be no electric charge that will be produced.
This will bring issues when you try to use your outboard motor.
In such a case, your outboard motor will not be able to start.
This is because the spark plug will not receive any charge to be able to burn the fuel in the combustion chamber.
Solution
a) Replace Stator
If your outboard motor is not starting, you have to troubleshoot.
One of the things you have to test is the charge supply.
This will require you to test the charge coming to the spark plug.
If there is no charge, then you have to test the ignition coil and the stator.
When you discover that the stator is the one at fault, you have to make sure that you change it to a good one.
3) Use Of Bad Fuel
The type of fuel you use in your outboard motor plays a vital role in how fast your outboard motor will start.
A good fuel will be quick to ignite when the spark plug produces a charge to burn it.
But if the quality of the fuel is bad, then it will not ignite easily.
This could be that the fuel has water in it or other dissolved contaminants.
When this occurs, then the outboard motor will not start.
Solution
a) Use Good Quality Fuel
One of the solutions to mercury 9.9 four stroke starting problem is to use a good fuel always.
To get the best out of your outboard motor, you have to make sure that you use a good fuel.
This will increase the performance and longevity of your mercury 9.9 4 stroke outboard motor.
When you have starting issues with your 4 stroke outboard motor, you have to check the quality of fuel used.
If the fuel has stayed for too long without use or is a bad fuel, you have to replace it.
In doing so, make sure that you use a good fuel.
This will help correct starting issues when you are using your outboard motor.
4) Clogged Carburetor
The carburetor is a very important component as far as starting your outboard motor is concerned.
This is because the carburetor helps in supplying the optimum volume of fuel to the combustion chamber.
The spark then burns the fuel and causes the outboard motor to start.
But when there is no fuel in the combustion chamber, then there will be no combustion.
This is usually caused by a clogged or bad carburetor that will not supply fuel to the combustion chamber.
Solution
a) Service Or Replace The Carburetor
When you discover that your carburetor is not releasing fuel due to being clogged, you have to solve it.
This can be done in two ways.
One way is that you can open the carburetor and flush out the debris.
Another is that you can buy a replacement for the bad carburetor if the carburetor is really damaged.
This will help make sure that the carburetor releases fuel to the combustion chamber.
5) Bad Plug Cap
For the spark plug to perform, it has to receive an electric charge.
But this is done through a medium.
This medium is the plug cap.
If the plug cap is bad, then there will be no transfer of electric charge to the spark plug.
This will result in no combustion thereby causing the outboard motor not to start.
This is one of the causes of mercury 9.9 4 stroke starting problems.
Solution
a) Replace Bad Plug Cap With Good One
If you discover that your plug cap is bad, you have to replace it.
In doing so, you have to make sure that you replace it with a good one.
This will help provide an electric spark in the combustion chamber.
With this, your outboard motor will be able to start.
6) Bad Fuel Line
For the carburetor to receive fuel, it has to be delivered from the fuel tank.
This is usually done through a medium.
This medium is the fuel line.
If the fuel line is bad, then there will be no fuel supply to the carburetor.
Due to this, the outboard motor will not be able to start.
Solution
a) Use Good Fuel Line
If you discover that the fuel line in your outboard motor is bad, then you have to make sure that you replace it.
In doing so, you have to make sure that you replace it with a good one.
This will help solve the non starting issue if the bad fuel line was the cause.
7) Stuck Carburetor Float
For the carburetor to function well, then the components that makes up the carburetor have to function well too.
One of the components in a carburetor is the carburetor float.
This regulates the inflow and outflow of fuel in the carburetor.
When this component has a problem like getting stuck, then the carburetor will work in an abnormal way.
if the carburetor float gets stuck in the open position, then the engine will receive excess fuel than it can burn.
Thiis will lead to a smooking engine while the engine is running.
If the engine is off, then it will cause a flooded engine which will make the outboard motor not to start.
If the carburetor float is stuck in the closed position then there will be no fuel flowing into the carburetor.
If it occurs while the outboard motor is running, then the outboard motor will jerk and stop due to non supply of fuel to the combustion chamber.
If it occurs when the outboard is not running, then the outboard motor will not receive fuel for combustion.
Due to this, the outboard motor will not start.
This is one of the causes of mercury 9.9 4 stroke starting problems.
Solution
a) Unstuck The Float
If you discover that your carburetor float is stuck, you have to make sure that you unstuck it.
This will allow the carburetor to function well by receiving and also sending out fuel.
Due to this, your outboard motor will be able to start and perform well.
8) Bad Ignition Coil
The stator helps in producing an electric charge for combustion.
But for this electric charge to be worthy of burning fuel in the combustion chamber, it has to be super charged.
This is done before the electric charge is delivered to the spark plug.
For this to be done, the ignition coil has a duty to make this possible.
The ignition coil helps in boosting the electric charge it receives from the stator.
This electric charge is boosted to thousands of volts.
This is what helps to burn fuel in the combustion chamber.
But if the ignition coil is bad, then the electric charge will not be enough to burn fuel in the combustion chamber.
Due to this, the outboard motor will not be able to start.
Solution
a) If you discover that your spark plug is not receiving enough voltage, you have to check the ignition coil.
If you discover that the ignition coil is bad, then you have to change it.
In doing this, you have to make sure that you change it to a good one.
This will help solve mercury 9.9 4 stroke starting problems caused by a bad ignition coil.
With this, your outboard motor will be able to start quickly.