I am a first time owner of a new GT200. This is my first scooter. I have had my scooter for about 6 months and have 2200 miles on it. I think I have auto-transmission slipping but can´t be sure due to the fact that I have zero experience. My scooter has gross vibration or chattering or a stutter when taking off from a complete stop, mostly when the scooter has been sitting for a while and the engine is cold. I don´t notice it when I have ridden for a while. The engine itself seems to run ok. Is this symtomatic of transmission slippage or another problem? I do not run the scooter hard or otherwise abuse it. I am a 62-year-old with few mechanical skills. Can someone help me?