How can you tell if the timing belt needs to be changed other than mileage and the obvious snap, it's too late. I bought my GSR last September and the owner told me just changed it 6 mos before I bought it(She has 105k on the motor). The bottom part of the cam gears are exposed which shows the timing belt. Now when I watch my car idle then observe the timing belt, it seems as if it's a bit loose as the belt flexes or in my eyes, 'dances'. (Sorry for my lack of technical terminology knowledge for this description) Thoughts?