The GY6 engine is setup with CVT (continues variable transmission) and you can tell if yours is this type of engine if it is belt drive and has an automatic choke (in most cases). The CDI is the electronic brains of the engine and when it doesn't work your scooter just won't start. They can cause intermittent problems but if they start doing that it usually isn't long and a new one is the only way to make your scoot go!
If you have a Chinese made 50cc or 125cc 4 stroke scooter this is likely the CDI you will need.
Please review these other products:
This is a belt that is used on GY6 engines. Size 669 18 30
This performance CDI is for made in China GY6 50cc & 125cc engines.
Performance coil for the 50cc and 125cc GY6 engine. Chinese FOX brand.