I would stick to the Lifan ones personal. I run a couple of the Lifan CT70 remake engine and had no problem and my oldest engine I had for almost six years and rode a lot with out any trouble. I have noticed H/F have made some changes to there engines to keep Honda off there back for copy right infringements. There a extra bolt on valve cover, air cleaner, gas tank, different and changes in the flywheel cover. I think internals are the same.