My bike started making some very loud noise in the valve train area so I pulled it apart and shimmed everything up to spec. It was BARLEY out of spec. Then is still made the noise. Then I thought I had a very bad tank of gas and it was knocking very loudy. Wierd so far to say the least. Then I shut my bike down and saw a large cloud of white smoke come out of the breather tube off of the top of the engine. Every time I kick the bike over it blows white smoke out of that tube. Any thoughts??? Could it be rings? Or would a water pump seal be more likely?