my banshee is acting up and i was wondering if anyone could help me figure out what the problem was. the bike will start fine idle fine, but when i rev it, it acts like it dont want to rev up. then when you take off on it, it wont hit the powerband. and i've changed the stator, the coil, the cdi, the plugs, the fuel, cleaned the carbs, changed the reeds. for some reason it still does it. i thought maybe it was the head gasket. what to you think?