From the day I bought my 09 Vn 900 Custom brand new, I would hear a whining noise that sounded like it was coming from the pulley. After doing some research, I thought i needed a belt adjustment. I brought the bike to Kawi for a tune-up, and told them about the noise. After the tune-up, they rode about 5 miles on the bike, and they said all the noises that I am hearing are perfectly normal. Anyway, i got louder pipes, so the noise isnt as noticeable anymore. I know it's there, and I hear it some times, but the pipes do a good job of drowning it out.