Thank you for the response Kriden. Your rough idle could be due to a need to initialize your TPI/ABV (basically resetting your TPI/ABV). See the attached picture with instructions. " It is from the Kymco factory service manual." The dealer and the manufacturer is the most knowledgeable about your scooter , unfortunately, if you criticize your own product you risk the chance of losing your job. Today, I manufacture and test vehicle parts, but many years ago I was a mechanic. If a mechanic criticizes the companies product that he works on, it would not be good. I was not allowed to discuss with the public some problems that existed with our products.This might or might not be the case with kymco but sometimes if you want to be sure your getting a totally unbiased answer, you might have to ask a mechanic that is not associated with, or does not sell the Kymco product. You need to ask a neutral party. That's why I appreciate your answer and I am just trying to gather information. I would appreciate more comments on others top speeds and their ECU's. I hope we all might benefit.