most of the good ones are overseas, try:
Monkeybike UK Home
CH Performance, CHP, Classic Honda USA, Honda CT70, Z50, Pit Bikes, Monkey Bike, XR50, CRF50, NSR50, XR70, CRF70, Pit Bikes, Honda Minitrails, XR100 and NOS, Kitaco, Takegawa Parts and services.
Honda XR50 parts CRF50 parts Z50...