Well, I haven't been here in awhile and need the forums help. I have started to foul plugs om my 2000 Wr 400. I know what your going to ask and yes, I have done all the YZ mods and carb job and this has been done for over 1 1/2 years with no problems. I remember problems with CDI's on the YZ side but not ours. My bike fouls plugs every ride now and my mechanic in PA has said that he has 7 other bikes with the same problem. Now, most are 2001 and 2002 YZF's but the CDI change has fixed 4 so far. I searched the old posts and didn't find anything current on the topic. So are these bad boys a problem and if so what is the best brand to replace it with. Because the thought of buying another piece of junk from Yam. with no warranty since it is an electrical part enoys me. Also, if anyone has the Yam. part # for the odometer hub spacer replacement I would apprec. it. I hacksawed the hub open to use the spacer inside the plastic, and it is rusty now and my dealership has now ordered the wrong spacer twice. Thanks, Vic.