Nice find! If my memory is right, 81 Harleys were post AMF. AMF Harleys were the great leakers, with some nasty paint runs on the tank.
AMF was the reason I bought a Gold Wing for a tourer instead of the FLH.


Those little RD400's were very quick machines, not as quick as my Kaw H2 500, but the Yammies handled better.