so my bike stopped running a while ago, but I wasn't sure exactly what the cause of it was. I finally got around to tearing down the carbs, and this is what I found (click on pics for larger version): I take it this is rust, even though it looks awfully dark for rust to me... I take it I need to tear them down more and make sure to clean everything out, and that I also need a fuel filter (I hadn't gotten around to putting one on before, this shows why I should have). Anything else I need to do before putting them back together? They were stored properly, ie drained.