mine does that too, shouldnt be a prob unless your burning oil or your rings are wearin outwhen my 700 is cold it will shoot black smoke out if i rev it up when it gets warmed up it goes away is this a prob?
it may be the fiberglass packing burnin off a little, mine done it with stock pipe and aftermarket,how many hours is on your motor?:xx:as soon as i put slipon pipe on it started doing it
^^^ Im all about thisJust don't rev. Your motor when it's cold.