How do I reset the cam chain tensioner (already removed it)

[Fazerider]

Actually, I was talking bollocks... I was remembering a previous engine. :o
Marksfazer is correct. On the Fazer the bolt provides the seating for the spring and doesn't screw into the plunger.
Reassemble as he describes and the spring is what pushes the plunger forward so the camchain doesn't get overtightened.