I can't figure it out. I have a 97 XR 600 that is sputtering like it is starving for fuel when I run it wide open for more than 4-8 seconds? I have a Stage 1 HotCam, White Bros E Serries with 6 discs, and 14/48 gearing. I increased the main jet to a 260 (Mikuni Flat Side) and that didn't seem to help. I have adjusted to the floats up and down, no help. I am looking at adjusting the needle up one more clip (I believe it is on the 2nd or 3rd clip). After that, I am at a total loss! If anyone has any ideas, I would really appreciate it. I just replaced the top end and carb (done at a local race shop), and I would like to be able to fix it myself instead of paying them again! This bike used to scream when I crossed a long stretch of road, but now I can't do more than 60-65mph! It is a blast through all the gears and climbs like a Billy Goat! I love this bike and will be happy with it for a long time, but it's no fun having my friends on their silly little 300MXC's pass me on fire roads or in lake beds! Help, I'm the only one still hanging on to a big XR! Thanks in advance.