Got a problem on my '99LT that's got me a little stumped. Maybe some of you can help me diagnose the problem. Late last season I noticed a buzzing sensation coming from the engine that has become more pronounced this season. This is a vibration. The engine runs smooth and has no issues (no hesitation, stalling, etc.), except for this feeling which is most noticeable at idle (neutral) and low rpms only. It smooths out at higher rpms. The tupperware on the left side vibrates and rattles although everything is in tact and tight. The right hand grip also vibrates. It runs smoothly and is still getting 50-54 mpg. The bike has 68k miles. Meticulously serviced, mostly by myself, except for valve clearance adjustments (last checked at 60k by dealer-no adjustments required) and the cam chain tensioner (replaced by dealer at 60k). Last major service was performed by dealer at 60K. Last tune-up service (plugs, all fluids, filters) performed at 66k by myself. Idle is at 1,000 rpm +/- 50. I would appreaciate any input before taking it to the dealer. Possible idle speed adjustment? Synchronization problem? Past due for a valve clearance adjustment? There is a slight valve clatter, but no more than has been normal for the bike for several years. Bike has full power, no smoke, plugs were burning clean and even when replaced. Other ideas? Thanks.