I've looked through many many previous posts, and I have to say I'm even more confused now. I've got a '99 UK spec WR, and have just fitted a CRD pipe and header (pretty quiet!). Took the bike for a long blast around Wales over the weekend, and all seems fine - but: - a little hesitant on initial pick up, even in low gears - plug well and truly oiled up - excellent when wound up, just hesitant Its currently running standard timing and jetting (168 main), I want to get it to run sweeter, but I have to admit I don't know what all these various jets really do, and need you all to help. All suggestions eagerly awaited !!