I didn't put this in mechanics section because I want only responses from experienced ss users. A new lemond fillmore with ext bearings, gets an off and on again kachunk from the chainline. The bb and cranks are tight and feel good, it doesn't feel like the pedals. It is quiet for awhile then starts for awhile then goes quiet. The chainline looks straight and it runs like a freewheel (don't pedal while coasting). It happens when pedaling. Any ideas?