how is qmb139 camshaft chain lubricated

scooter parts, chinese scooter parts, chinese atv parts, parts, gy6, 139qmb, 1pe40qmb, cf250, big bore, higher performance, racing cdi, piston, 47mm cylinder, rings, gaskets, vip, roketa, diamo, scooter dealer, ignition coils, atv parts, drive belt, 669-18-30 belt, 729-17.7-30 belt, variator, clutch, pulley, crankshaft, engine parts, 792-16.6-30 belt, 788-17-28 belt, 743-20-30 belt, 835-20-30 belt