I had a lot of can chain noise so I installed a APE CCT. Made the motor sound beautiful. 40-50 miles later it is louder than ever! So I tightened it again back to beautiful and after 30 miles.... Guess what. Loud as hell again. Is it possible to stretch like that?? The tensioner does not appear to be backing out. Also when I bout the bike i replaced the CC guides and made sure the timing was accurate.