How to Replace a Carburetor for a Hatsu 4 Stroke MFS 15HP Outboard Motor

if your outboard motor is leaking fuel into the engine oil, it could be due to an issue with the carburetor.carburetor for tohatsu 4 stroke mfs 15hp A malfunctioning needle or seat valve may cause excessive fuel to enter the carburetor bowl and mix with the engine oil. Alternatively, a clogged vent in the crankcase ventilation system can cause pressure imbalances that force fuel into the oil.

Another possible problem is that the fuel pump is not delivering the proper amount of gas to the carburetor.carburetor for tohatsu 4 stroke mfs 15hp This can cause the float to become stuck and prevent it from floating properly, resulting in fuel leaks and oil contamination.

To fix this, you will need to replace the slow air jet, located on the right side of the carburetor. This jet is used during idling and low speed operation. To replace it, you will need a flat screwdriver with a head just a bit smaller than the diameter of the opening in which the jet hides. It is important that you do not try to push a larger screwdriver through the hole, as this can damage the jet for good.

Next, locate and remove the oil drain plug. To do so, position your outboard in an upright position and secure it with a jack stand or other suitable support. Once the plug has been removed, place an oil pan or other container beneath the engine to catch the drained oil. Using an appropriate socket or wrench, loosen and remove the plug and allow the oil to drain completely.

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