Mercury 25 hp 4 stroke troubleshooting10/31/2022 ![]() ![]()
In that case, remove the wire from the switch box and replace it.Īnother possible reason can be the carburetor as well… Use the tester on both wires, and if you cannot see any spark, you need to replace the wires. If you see the spark in both cylinders, that means your ignition system is okay.īut if you see no or poor spark on one or both cylinders, you need to inspect the yellow and black wires. Now, you need to set 3/8 inches gap on the spark detector and crank your motor to investigate the spark condition of each motor cylinder. You can get the spark tester or detector from any auto supplies or parts stores, and you do not need any specific type of spark tester for the Mercury 25 HP four-stroke. To verify whether the main culprit is the ignition system, use a spark tester or detector to test the spark. When your ignition system has no spark or even weak or low spark, your outboard motor will hesitate or run unevenly. #MERCURY 25 HP 4 STROKE TROUBLESHOOTING HOW TO#So, let’s find out what are the possible reasons and how to handle those. Several reasons can lead to this particular commotion since these types of issues are interconnected, Sometimes, they notice that the outboard motor struggles or hesitates when they put on the acceleration, and even the engine starts to run unevenly or surges. Outboard May Hesitates Upon Acceleration:Īnother common problem that Mercury 25HP four-stroke outboard users often complain about is the motor’s visible hesitation on acceleration. While inspecting the fuel filter, if it is broken or restricted because of excessive corrosion or other contaminates, either you should clean or replace the fuel filter with a new one. If the fuel lines are clogged or severely damaged, you should clean or replace the damaged fuel lines. If you notice loose connections, tighten them appropriately. Therefore, inspect all the fuel lines for any clogged or damage issues and also check whether any fuel line connection is loose or not. #MERCURY 25 HP 4 STROKE TROUBLESHOOTING FREE#Remember, the fuel tank air vent should always stay open and free from friction.Īnother possible reason behind this problem can be the damaged or restricted fuel lines and fuel filters. If it is not open, turn it on the open position. Therefore, check and inspect the air vent located on the fuel tank. The problem can also occur if the fuel tank air vent is closed or restricted. The fuel pump gets affected by the damaged diaphragm or one-way valves so, check them and replace the faulty part. Now, you should check the compression gauge reading, and if the gauge reading shows less or above 30 PSI, the compression gauge needs to replace. Then, disconnect and remove the cowl cover, the plug, spark plug wire boot. #MERCURY 25 HP 4 STROKE TROUBLESHOOTING MANUAL#The manual will guide you to select accurate specs and learn the exact procedures to follow to fix your fuel pump’s issue.įirst, start the fuel pump testing by turning off the outboard engine’s power. It may occur when your fuel pump has low pressure, so you need to perform a test to inspect the fuel pump and fix the problem.īefore performing the test, make sure to read the repair service provided with your outboard. ![]() However, various reasons may cause this particular commotion, but first, you need to do the proper investigation. Users claimed that the outboard motor runs irregularly or unevenly while they put it neutral or out of gear. According to Mercury 25 HP 4 stroke many users, sometimes the motor idles rough or stalls. ![]()
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