Hello all. Ok here goes. My 01 WR ran flawlessly until I decided to put on an after market pipe, after a-lot of thought I went with a CRD pipe. I didn't change any jetting, and I knew I would be a little rich because previously I had the stock pipe unplugged. This was in December and throughout the winter and average temps were 30s-50s F the bike ran well. Then in march the bike started running funny. I was fouling plugs after two or three rides hard breathing and backfiring loudly. So I changed my main jet from a 158 to a 155. This seemed to cure the problem for about another month, and then I started fouling plugs again and having a sputter or cutting in and out from ¼ to ¾ throttle, so I thought It was do to the temperature increasing, so needless to say, I tried about everything I could think of to fix this problem, including a $80 trip to the local dealer, still didn’t fix the problem. So I got fed up and put my stock pipe on and Set the carb up accordingly. The bike ran great for about 10 minutes then started sputtering in the same throttle range and started back firing and eventually died. Now I think that my problem might be electrical. I was wondering if any one has had a similar problem? My spark plug wire is very hard to pull off of the spark plug, and get back on. I have had to pry it off a couple of times. Anyway I am really frustrated, and don’t know where to go for help, since the local dealer couldn’t even fix it. I would appreciate any help advice, or there might be a WR for sale soon.