BTW, this is a street legal supermoto bike. I am hoping someone can shed some light on my sputter problem. The engine always starts right up. It always runs great when you're applying throttle. Problem: when at a cruising speed and approx 3/8 throttle or less, the engine sputters every second or two. As soon as the throttle is applied, it runs strong with no sputters. I just bought the bike today so I don't know any of it's history. It has a full exhaust and was told the carb has factory jets...I can't verify that. This bike came from Arkansas so I'd imagine it needs some jetting changes for the different altitude. What do you think?