i recently removed and re-mounted my wheels on my XR-R and had the tires replaced in between. i'm not mechanically inclined so it's a minor accomplishment for me. in any case, riding the bike afterwards i noticed it makes a buzzing noise from somewhere in the front half of the bike when coasting with the clutch in, kind of a "zzzzzzzz" sound. the bike has a mechanical odometer/speedometer. i usually wear earplugs, so maybe it did this beforehand and i never noticed. is this sound normal?