Honda-SOHC

I have a charging problem with my F2.Ive had the bike 30years and its always been the same. Over the years Ive replaced just about every component of the charging system but the problem persists. Im repeatedly told its a common problem with these bikes but no one has ever told me the solution. Anybody out there been through this that might help? Ive replaced
rectifier / voltage regulator /fuse box / ignition coils even the field coil. I cant get a stator coil but the resistance readings on it are ok per haynes manual. Any ideas......?