I got around to checking valve lash on my Lifan 1p52FMI with very low operating hours. I couldn't find manufacturer's recommendation. The original Honda CT90 motor had .002" (.05mm) listed for both intake and exhaust. Various unofficial recommendations for the Lifan seemed to be .003 to .005". The intake was at .002, exhaust had no measurable or palpable clearance. I set them at what ended up being .0025 intake and .003 exhaust. It had been taking two or three kicks cold to start along with choke, now it starts first kick every time with no choke (Mikuni VM22 clone carb).