i just git my first banshee the guy said it was .90 over,cool head, hot rod crank, v force stage 2 carbon reeds paul turner pipes with dg silencers, +6 swing arm, apparently it has stock carbs because the 35mms one has a broke srew and clip which i plan to fix arent installed. anyways i went riding and afterward it has a black oily substance allover the front of the motor and on the big part of the pipes why is that. also it seems to bog at low rpms it used to do it halfway through the rpms but after riding a while it seemed a little better but still did it any help would be appreciated as this is my first banshee