Hi everyone, I have recently bought a low hours bike which I am happy with coming from a four stroke, the only concern is that the gearbox seems rough in lower gears 1-4th smooth above that, on removal of the oil there is a little metal sludge on the magnet sump plugs. I have heard that the gearboxes are constructed differently, so is this normal, engine runs nice as pull the clutch in it's smooth. Any info would be appreciated.