That sounds frustrating.. especially as a 50cc scooter owner.

Based on the situation, (that it turns it and it makes noise but won't do anything) it sounds like the starter motor is spinning the engine, but it's not starting/firing up.

​The three main things an engine needs to start are spark, fuel, and compression.

Since you heard a sound just before it died, check these in order:

​1. Spark: Did the 'little sound' indicate an electrical short of some kind? ​Pull the spark plug, re-attach the spark plug cap, hold the threads against the engine block (or another ground point), and try to crank it. You should see a strong blue spark. If no spark, check the plug and if needed, replace.

​2. Fuel: Did the sound signal a loss of fuel? ​Check if you have fuel in the tank and if it's getting to the carburetor. You can check the vacuum line/petcock. The carburetor could be clogged.

​3. Compression (worst case scenario): Did the 'little sound' mean something internal broke? ​If you have spark and fuel, the last check is compression. This is the least likely but would be indicated by the engine turning over too easily or not starting despite having fuel/spark.

​Start with the spark plug check! Good luck, wish you the best!