hi guys,new on here so hello to all members. my nephew has decided to sell his bike which is indentical to mine (wr450 / 2004) but we have come across a problem that has us scratching our heads. bike rides fine,gears all ok,but stand bike in neutral and roll backwards and the rear wheel locks up,this happens if engine is both running or off! can anyone help us and tell us your thoughts or has anyone else encountered the same problem! many thanks,nick dalby,uk.