- Jun 7, 2003
I bought my 2003 yz125 in June. I changed to a 37.5 pilot, raised the clip one position, and am running an 8 instead of a 9 plug. The jetting seems perfect now, and the plug shows a perfect burn. My problem is, there is a vent hose that exits by the exhaust that drips quite a bit of black crap. There is nothing coming out of the silencer, and the bike seems to run great. I have a freind who has the exact same bike (same jetting, plug, everything), and his doesn't do it nearly as bad as mine. I know a little is normal, but why is mine so much?