Start squeal / Plastic oilgear squeal GY6

[Kymcodingo]

Hi everyone,

I am getting a squeal using the electric starter. Sound disappears as soon as the engine starts. Scoot starts and runs great. Changed the startermotor for a brand new one, still squealing upon start. No abnormal marks on the teeth of the old startermotor. Will try other bendix today. What could be the cause of this squaling sound ? Belt too old 6k miles ? Sound: https://voca.ro/1iIm0v7PpK7W

Scooter is a Kymco Agility. Engine isn't original kymco just a GY6 139QMA 50cc. It has the original Kymco stator in it for DC. This setup has been working great for over 16k miles.

The original Kymco engine (KG 10 SA) got ruined because it had a plastic oil gear in it (can you believe that engine came with a PLASTIC oilpump gear). Around 20k miles the plastic teeth on this gear were nearly completely grinded down to nothing and also caused a very similar squaling noise before total engine failure at speed in traffic. Continuously though and proportionally to revs, slightly less high pitched and less loud.

Before i open up that entire side of the engine to get to the oilpump, i thought i ask you guys here for advice, and warn you about this plastic oilpump gear failure you could be getting down the road.