If the cam chain tensioner goes bad, you will know it. Bike will run but will sound terrible; like a coffee can full of nuts and bolts. Cam tensioner could be spalling out but still have enough meat to keep the chain in place. How many miles does your bike have? Someday, you will have to replace the tensioner anyway. Many of us on this CX/GL500 forum have done so. Its pretty easy but you have to take the motor out to do it. That's easy too.