I was worried as well about mine until I bought an 85 for my wife, it had the trouble, it sounded like shaking a paint can and hearing the marble clack against the bottom of the can, it mostly occured at idle. you can MAKE it occur, if you just want to be sure, by inserting screwdriver into adjuster with cap off top, carefully, not to turn very hard, with at idle, turn clockwise i think (winding spring, other direction will not turn far at all, then stops) screw should turn with only a winding feeling, you will feel a wobble vibration from the screw, if it is really wobbeling strongly, that is a sign of a weak spring and time to concider rebuilding the tensioner. you should hear noise within first turn, if not, dont keep turning much past a whole turn, and stop immeadiatly after you hear the noise, when you release the screw, the noise should go away as the tensioner does its job of unwinding the spring again. dont keep winding after you hear the noise come. you wouldnt want the chain to get so loose it comes off and damage your engine or mess up timing or anything.
Disclaimer: I wouldnt reccomend doing this on a new bike. ususlly no tropuble with this until over 12k miles. however, this proceedure is not for just anybody, and not going to say it is a good idea, but if you really want to hear it, that'll do it. any comments from the other wrenches, is this a bad idea?