Hello Guys!  I'm new to your group and new to Suzukis too.  I just bought a 1998 LS650 Savage.  Only about 15,000 miles on it and seems to be in great condition.  That is with one exception.  The first owner (I'm 3rd) put on a Jardine muffler and advised 2nd owner that it ran rich since that install.  In reading the repair manual I read that other than stock muffler can cause engine to run rich and cause mini-"explosions" in the muffler on shut down.  Mine does this and for htis reason I believe it's running rich.  I haven't looked at the plug yet but will.  Have any of you had this problem andif so did you re-jet and if so, what size or number jet did you use.  I live in Florida an operate basically at sea-level.  I will appreciate your help and advice.  Thanks  KIX