What is the reason why a 125cc motorcycle stalls when the throttle is applied?
2 Answers
125cc motorcycle stalls when the throttle is applied may be due to the small torque of the motorcycle engine at low speeds, making it prone to stalling. It is necessary to check whether the motorcycle is idling. Below is a detailed introduction about motorcycle idling: Overview: Motorcycle idling (commonly known as small fire) refers to a working condition when the motorcycle is stationary and the engine is idling. The level of idling directly affects the fuel pump volume of the motorcycle, and excessively high idling can also affect the fuel consumption of the motorcycle. Others: Simply put, the idling speed can be adjusted by changing the throttle opening size. Open the left side panel of the motorcycle, and turn the idling adjustment screw clockwise to increase the idling speed, and vice versa to decrease it.
I've encountered the issue of a 125cc motorcycle stalling when throttling many times before, mainly because the carburetor was too dirty and blocked the fuel line. As I often see during repairs, the accumulation of dust and impurities causes poor fuel injection. When you twist the throttle, the fuel supply can't keep up, and the engine stalls immediately. Another common issue is a dirty air filter; when it's clogged with dust, air can't get in, resulting in an overly rich mixture that drowns the spark plug. I recommend first removing and cleaning the carburetor thoroughly, then checking if the air filter is worn out and needs replacement. If this doesn't solve the problem, it might be due to insufficient fuel pump pressure or a fuel line leak. Don't underestimate such minor issues—leaving them unresolved for a long time can accelerate engine wear, and delaying repairs will only make fixing it more troublesome later on.
