I got my '03 1200S a couple of weeks ago. From previous metric bikes and a FXRT in '92 I thought I had the enrichener figured out. Three days ago it started popping and backfiring and would barely run. I put new fuel in....no help. I pulled both left sparkplugs and they were extremely fuel sooted. I called my dealer and he said to put in four new plugs (got Champions at the local non-Harley Harley store for about 1/3 price of H-D plugs....same plug). After about five minutes work for the outer plugs and an hour of work getting the center plugs installed, I tried it out. Bingo...ran great....plugs looked great when I checked 'em. The dealer said probably too much enrichener use even though I followed the manual instructions. He's going to check it Friday for any air leaks just to make sure. Anyone else have fouled plug or enrichener problems or tips? Thanks.