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1. After the valve leaks, the sound of the engine will have a sudden noise, and there will be smoke. When the engine is climbing, if it is more serious, there will be more serious carburetor backfire.
2. When the valve leaks, you can remove the distributor cover, then remove the air filter, and finally open the choke door and throttle valve. Then listen to the sound of the carburetor with your ears. If you can hear the sudden sound, then the valve is leaking.
3. The gas source can also be used to diagnose whether the valve is leaking. Use a relatively long hose to connect it to the air cylinder. In this way, you can check whether the carburetor is leaking. If there is, the valve is most leaking.
There are many ways to check valve leaks, but you must pay attention to safety when checking. If it leaks, there will be oily fumes, and more serious sparks, so you must be careful when checking.
