It sounds like you may be experiencing a problem with the carburetor or fuel system of your 2-stroke 50cc scooter. Here are a few suggestions to help diagnose and resolve the issue:
Check Carburetor Settings: Ensure that the carburetor is properly adjusted. The fuel mixture screw, idle speed screw, and throttle slide should be set according to the manufacturer's specifications. If you recently cleaned the carburetor, double-check that all the components are correctly reassembled and that there are no air or fuel leaks.
Fuel Supply: Verify that the fuel line is free from any blockages and that fuel is flowing freely from the fuel tank to the carburetor. Check the fuel filter to make sure it is clean and not clogged.
Air Intake: Ensure that the air filter is clean and properly installed. A dirty or blocked air filter can restrict airflow and affect engine performance.
Fuel Quality: Make sure you are using fresh, clean, and properly mixed fuel for your 2-stroke engine. Stale or improperly mixed fuel can cause starting and running issues.
Spark Plug: Check the condition of the spark plug. It should be clean, properly gapped, and in good working condition. If the spark plug is worn out or fouled, it may prevent the engine from starting or cause erratic running.
Vacuum Leaks: Inspect the intake manifold and any associated gaskets for any signs of leaks. Vacuum leaks can cause erratic running and affect engine performance.
If you have followed these steps and the problem persists, it might be helpful to consult a qualified mechanic or scooter technician who can perform a thorough diagnosis and repair. They will have the expertise and tools necessary to identify and fix the specific issue with your scooter.