Ive read quite of few noise threads and its seems the 900s make plenty of them. The noise Im hearing is in between 50-55 mph and its coming from the rear of the bike. Its hard to discribe it but it like ch ch ch quick pause ch ch ch. Kinda like a exhaust leak but thats not the case. I sound retarted describing it but when I first heard it I was passing a field and I thought it was crickets out there haha. But I can cruise at around 54 mph and hear it the whole time. Its not real loud or bad but wanna make sure its ok or maybe I need to check something.