I agree with MarkinAR. Critical parts especially when they are part of a serious re-build need to be OEM. It is not worth spending hours rebuilding an engine only to find that a cheap part failed (such as rings) or perform badly. However, brake pads / shoes and many other parts from China are perfectly acceptable and cost a fraction of the price. It is also important to remember that many of the OEM parts are made in China and are often sourced from the same Chinese manufacturer. I have also been very successful with carburetor kits (including jets) for all of my ATVs. It may be worthwhile creating a list of quality Chinese manufacturers on a forum on this platform.

My first move is to take the OEM part number and hit Amazon and feebay. sometimes you can get OEM on feebay quite a bit cheaper. Ultimately, it depends on what parts though. Case gaskets I'll buy whatever is cheap, head gasket OEM only. Bearings I use measurements or cross reference and buy at the parts store because you can get good Timken many times as cheap as chinese junk. Rings are OEM ONLY for me, timing chain is always DID. Brake pads I'll buy chinese junk because I've never had an ATV or UTV that didn't kill brake pads in no time anyway so might as well buy the cheap ones.