I have an 02 WR 426 and recently switched to YZ timing. On the first couple of rides I noticed that at constant throttle, anywhere from 1/8 to 1/2 throttle I get a real distinct miss. Like a constant sputtering. I tried jetting all over the map and nothing changed it. I didn't have the problem with WR timing. After a week of testing everything I could possibly think of, I decided to go back to the WR timing. I did and the sputtering is gone now. Has anyone else experienced this? I'm wondering if all YZ's do this or if maybe there is a difference in the CDI box. I really like the YZ timing and I'd like to switch it back but that sputtering is really irritating. Here's my setup currently: Free mods done, including grey wire, 42pj, 165mj, DRR #3 needle, Yoshi pipe. As I said I tried all kinds of different jetting and it change anything. Let me know what you guys think. Thanks.