What is the correct procedure for tensioning the chain on the mar?

Not sure about the correct procedure but on all my bikes I set it so it doesn't get over tight once i'm aboard and the suspension is slightly more depressed.

You've got a chain tensioner to take up the slack when its on the over run so its not absolutely critical as long as it isn't tight. Just make sure both snail cams are set the same way around and adjusted by the same amount at each side.

 

Its actually taken me longer to think about how to do it than do the job

Worth checking your chain tensioner has both springs still attached and working otherwise they tend to sag.

 

There should be one spring wound around the swinging arm and the tensioners arm.

And another spring from the tensioner block (where the chain runs through) to a pin welded on the inside of the swinging arm.