Originally Posted by Lutz
As a temporary measure, you may want to try the method of 'manually adjusting' the automatic tensioner, just to see if it quiets it down.
Yes, fair method of diagnosis, but keep it "temporary" as Lutz suggests. Krieger gives a very good explanation of why this method puts too much tension on the cam chain and can be damaging.
'06 KLX351, '06 KLR650, '04 KDX220, '07 XR250R, '73 CR250M