Just got my bike a couple of weeks ago. Full exhaust and stage 3 jet kit is what the previous owner told me was installed. The bike runs awesome at more than just off closed throttle. When the throttle is opened just slightly, the bike sputters. Not really bad, just enough to be annoying. I changed the plugs and ran some carb cleaner through a tank of fuel. This has helped a little. I was told by an aquaintance that it sounded like the carbs need to be synchronized. Just wanted to throw the question out there before I break down and buy a synchronizer.