Could have been poor quality bearings. I brought some online and they lasted a couple of hundred miles. I tore down again and put brand name bearings in purchased from a bearing supplier. Make sure the bearings are non chinese origin and if they are not etch marked don't bother installing them. The tea kettle sound was probably the air leak possible when the crank seal let go due to excessive bearing play. The clutches in these bikes are rattly. pay attention to the shimming with correct gaps, the gapping is described in the service manual. The brass bushing is cheap and makes sense just to replace it making sure it spins freely on the shaft and clutch.