Just did a complete rebuild on my '04 KX300bb including all the bottom-end/case bearings, but I didn't check to see where the OEM bearings were actually made. We're about to go through the 500's bottom-end with OEM bearings, gonna have to check now. Chinese anything concerns me, but like prior said, there are build quality differences so not everything from China is straight junk, but believe me, it still makes me nervous. (Like why I'll never waste my money on any Hotrods crap)