...Iron Barrel engines almost always have a lot of sludge in them when you open them up.
What is causing this? Oil not getting changed frequently? Or not letting it ALL of it drain out when changing? I only put a couple hundred miles on mine before the teardown, so I am guilty of not changing the oil on this bike yet...because when I loosened the banjo bolts at the head to check for flow, it looked normal and light brown -not dirty at all. I noticed the sludge was both in the oil tank (rear section of cases) and the front portion where the crank sits.