Got an issue with a slight sputter that seems to appear just before I shift into the next gear. We've checked the electronic ignition, adjusted the lifters, replaced the ignition switch, cleaned the carb, sealed the intake, cleaned the petcock screen. The bike will run fine at times with no sputter, then after a stop and rest , it may start up again. I can bypass the stutter by accelerating but if I maintain a steady 55 mph, it will act up occasionally. Sometimes the stutter is slight but other times it may be more intense. The bike ran fine last season but around Sept. it began running rough. I ended up with a stuck valve and replaced all 4 lifters and rods this spring. Still can't find the source of the stutter and it's driving me nuts!! Getting a lot of other things fixed though!!.... The bike starts and idles fine.