I've got an 02 wr426 with around 5500kms on the clock. So far its been pretty much bulletproof. However, just recently i've been having what appear to be carby problems. After warming the bike up, it runs really rough in the mid range, sometimes failing to even rev into the top end. It splutters and pops and won't rev out. Only after the bike is really hot will it rev cleanly, and after that it's ok, as long as I don't let it cool down for too long. I took the plug out to see if I could get a gauge on what is happening and it looks like its running really rich. The thing is, on every previous plug change its been perfect. Took my plug into the local dealer and he said my needle could be a bit worn and to try moving the clip one position leaner, which appears to have fixed the problem. Although just looking at the needle I couldn't see any obvious signs of wear. What i'm concerned about is could moving the clip be masking another problem, as I noticed in this forum that most people have their clip position set at number 4..