All OHC bikes and probably cars made in the far east have no cam bearings. The load on the cams isn't near as much as on the crankshaft, so they seem to think they can get by with it. If you find your cams fitting way too lose in the heads someday in the far off future when it is hard to find a replacement head, there are a couple of ways to deal with it, but you will need to find a machinesop you trust that can do line boring and bearing fabrication. By reboring the cam journals in the head, you can either use special made shell bearings or revert to the poured babbit bearings used in the 20's and early 30's. On the end bearings, it would be possible to use bushings, but the inner bearing would take some special care.
