Need help asap on position of timing chain

My cousin took apart his kz750N 1982 4 cylinder and did a valve adjustment but when he went to put the chain back on he forgot what and how to line it up correctly so the timing would be right I would appreciate the help because the bike is currently sitting in the driving tore apart

thanks all in advance

:dry: U NEED A MANUAL

He had one and after giving up looking for it he finally found it... also found one online also