If you’re an avid boater, chances are you may have experienced the frustrating situation of trying to start a flooded 4-stroke outboard. This is not uncommon, particularly when it has been left unused for a significant amount of time or when it has been subject to extreme weather conditions. Fortunately, with some basic knowledge and a few simple steps, you can learn to start a flooded 4-stroke outboard and get back on the water again.
1. Preparation
Before you start working on the engine, first ensure that the boat is secure and that the fuel supply is turned off. This prevents any unwanted movement or fuel spillage during the process. You may want to disconnect the battery as well for added safety.
2. Locate the air intake
Next, locate the air intake on the engine, which is typically on the side or back of the carburetor. This is the point where the engine sucks in air to blend with the fuel for combustion.
3. Remove the spark plugs
Using a spark plug wrench, remove the spark plugs. This will enable you to remove any excess fuel that has accumulated in the cylinder.
4. Turn the engine over
Next, turn the engine over by either using the starter switch or by pulling the starter cord. You’ll see droplets of fuel spray out, indicating that fuel is still in the cylinder. Allow the engine to crank for a few seconds without allowing it to start.
5. Put some oil in the cylinders
Pour a few teaspoons of engine oil directly into the spark plug holes. This will aid lubrication during the start-up process and help prevent any damage to the engine.
6. Replace the spark plugs
After pouring the oil, install the spark plugs and tighten them with a spark plug wrench.
7. Start the engine
Now it’s time to start the engine. Turn the key or pull the cord, and the engine should start more quickly than it did before. It may sputter or backfire a bit initially, but this is normal. Once it’s running smoothly, let it idle for a few minutes to clear out any remaining fuel or oil from the cylinders.
Starting a flooded 4-stroke outboard is not as intimidating as it may seem. With some basic knowledge and a few simple steps, you can get your engine running again and get back to enjoying the water. Remember to always follow proper safety precautions and never take shortcuts with your engine. Happy boating!