What chain are you referring to - primary or secondary chain being loose? And what area does the chain seem loose, can you post a picture.
You will have "some" slack on the tensioner side of the chain, this slack will disappear once engine is started and oil pressure goes up.

 

 

Put the video on YouTube or your host of choice and post the link to it .......

Graham

 

Video is live...took some time, new to uploading videos on youtube...and have so far avoided having an gmail account:-)

 

Provided that you have the cam lock tools and flywheel pin in place correctly, this puts the engine is safe mode. Once the new chains, tensioners and guides are in place and torqued down, you can take the cam lock tools off. It doesn't matter what side you take off first. When you take them off, the cams might move slightly, but the slack is there because there is no oil in the tensioner, and the engine hasn't turned over. Once you start it and oil pressure goes up, the slack will go away. Just make sure you don't forget to remove the flywheel pin before starting it.