What are the reasons why a 125cc motorcycle won't start?

2 Answers
DelLilah
07/24/25 2:11am
There are three main reasons why a 125cc motorcycle won't start. Below is a detailed explanation of these three reasons: Magneto failure: If the magnetism of the magneto rotor is weak, kicking the engine will result in very low RPM, and the electricity generated by the magneto will not be enough to produce a strong spark. The motorcycle will only start when the RPM reaches a certain level, so it is recommended to replace the magnet. Battery discharge: Check if the battery has power. Generally, if the battery has been left unused for a long time without timely charging, it can easily get damaged and should be replaced promptly. 3. Spark plug or carburetor failure: If the battery is working normally, then the spark plug should be replaced. Additionally, it could also be due to water or debris deposits in the carburetor. In this case, loosen the screw at the bottom of the carburetor to drain out the debris or water.
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VanNolan
08/10/25 9:48pm
There are quite a few reasons why a motorcycle won't start. Having ridden motorcycles for over ten years, I've encountered this situation several times. The most common issue is with the fuel system—the tank might be empty, the fuel valve might not be open, or the fuel line could be clogged with debris. Next is the electrical system: the battery might be old and drained, the starter motor might be too weak to crank, or the spark plug might be dirty or have incorrect gap settings, leading to insufficient ignition energy. This is more common in cold weather when the engine oil becomes too thick for the engine to turn over. When this happens, I first check the fuel level, pull out the spark plug to clean it, and inspect the battery connections for looseness. Regular maintenance can prevent most of these issues, such as cleaning the carburetor and replacing the spark plug. Additionally, you can try push-starting the bike, but be careful not to damage the engine. These methods have worked well for me, saving a lot of money and time on repairs.
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