I think a lot of design is shared between Asian scooter engines. The Yager engine design is very similar to the two Yamahas I have owned. Both had/have strainers in the bottom of the engine, and one has the filter element that goes in the side with a three-bolt cover. That the GY6 "generic" Chinese engine and the Kymco might share a few parts wouldn't be surprising, or necessarily a bad thing.