I have a Fe650 from 2004.
the 2004 tensioner blade seems to lose its curve after some time in the bike you see this when you lay it side by side to a new 2004 tensioner blade. because of this i only had two cliks left on the adjuster. i then put in a 2005 blade and got back to 7 cliks left on the tensioner. the 2005 is a diffent design and hobefully lasts.
I started to notice this because when i replaced the cam chain for the third time I mesured it side by side
to a used chain and there was almost no difference in length
Regards