Has anyone had experience with a timing advancer? I had a Dyno jet kit fitted and the shop where I had it done say they left it running on the rich side. The bike just isn't pulling like it did with standard jets. I spoke to the chap and he said they can make it slightly leaner but will fit an advancer to help as well. Apparently it advances the motor about 4 degrees. I'm unsure what to do as the bike was pulling so well with standard jets maybe I should just go back to that rather than more changes. What do you think?