well lets here start iv got a kdx 200. 2002 i just put a new fmf pipe gnarly head pipe and turbine core ll-q spark arrester silencer the leak is comming from where the two meet together and are joined with the rubber pipe ring it leaks black crape all over the place iv tried to move the o ring in the middle but it keeps sliding back iv tried wire ties everything it wont stop leaking .has any body else had this problem it is driving me nust.. please HELP!!!!!!!!!!!!