OK guys, I heard a familiar sound last night and now I'm curious as to what causes it. On my 05 650L I changed oil at 500 miles. Now on cold starts it buzz's from the right side crank case for about 30 seconds then slowly goes away. I've heard this sound from my 86 xr600r for forever, after letting it sit for more than a couple of days start it up buzzzz. It didn't happen on my L until I changed the oil and filter. Its still getting oil when it starts as I loosened the top end oil supply tube when starting and oil pours out so I'm not real concerned, and my 600r has had no problems either. Anybody else have this sound and know what it is? Its the middle of winter up here so there's no bees in my shop. Thank you, oh knowledgable ones!