As I wrote previously, I don't have a Kinetic, but I do have a Vespa Ciao. They are very similar in design. Since it is a single speed (i.e. non-variable) transmission, acceleration is slow. It will pull me up a hill, but sometimes not from a dead stop. In that case, I often have to pedal to get going. Once it gets some momentum behind it, it is fine. What is your top speed? If it is around 30 mph, I doubt you have any problems, just the symptoms of a single speed transmission. There are some ways to increase power, but I've avoided them thus far on the Ciao. On it, 30 mph suits me just fine. It just takes me a while to get there!
Chris (from St. Louis)