I've ran that head it is a Chinese copy of a XR70 head but the casting is not as clean .
It is like a XR50 head with slightly larger valves . I have about a hundred of these heads in stock but I'am sending them back because I get a better head for same price or I might just blow them out for cheap but I do not recomend them I beleive for the same price there are better heads availible . I would try Classic Honda's HRC head first
It is like a XR50 head with slightly larger valves . I have about a hundred of these heads in stock but I'am sending them back because I get a better head for same price or I might just blow them out for cheap but I do not recomend them I beleive for the same price there are better heads availible . I would try Classic Honda's HRC head first