Took my baby out for the first ride of the year and was reminded of increased vibration at both pegs and handlebars. Came on at around 4,000 miles (6,400 km). The odometer is now at 4,800 miles. Seems to be rpm related, that is it occurs as the engine is revv'd. I balanced the throttle bodies when I first noticed it with no change. When it is consistently warm outside I plan to pull the body-work and check for fastener tightness and do every bit of the periodic maintenance. Anyone have any comments? Could it be plugs at this low mileage?