What are the sizes of the valves in the BVH that everyone is putting on their engines? Also I have a 3 valve head on my CRF110 Lifan engine, anybody have any info on these? It seems strong but I've never ridden a 2 valve 110cc. Also what transmission pattern is best in the Lifans? I ask all of this because I'm considering a 125cc Lifan. Please tell me what you know.