Setting timing on 1980 Suzuki GS450 adjusting timing chain

got this bike in w a stuck motor, turned out the timing chain had jumped n stuck the motor,, probably chain adjuster not adjusted properly , lacking routine maintenance, heres the fast correct way to adjust timing,,, very little on the internet, so reason to provide you a youtube on it. i'm not an expert on Suzukis but can service them.. pls [e-mail]