my 1500 has just started a very loud whining noise when i let off the gas. when it´s doing this, i can pull in the clutch lever and it stops, or give it gas again and it stops..or at least is not near as noisy. i have pulled the rear end and took it to a friend who is a car transmission mechanic and he thinks it´s o.k. the bike shifts great and no clunking or anything like that. any suggestions would be appreciated. thanks, bud