my 2005.5 950 adventure has an odd whistling noise when I'm pulling away from a stop. Clutch is slipping or all the way out, low rpm, smallish throttle openings. It might happen at other time, but wind and mechanical noise drowns it out. It is, however, quite noticeable otherwise. It is coming from the front of the bike and is definitely engine related. Normally I would suspect a vacuum leak, but I've had it all apart pretty significantly and haven't been able to find anything. It doesn't really have any bad running habits aside from being jetted on the rich side. Any ideas? Is this normal? I've never been around another lc8 with the engine running, so I don't have much to base on.