Hello to bring everything together quickly. I drive a Peugeot Jetforce 50cc kilometers he has jzt 13000 on it. Rebuilt are only lighter weights and sports exhaust. The following problem. My scooter if I want to speed up Accelerates quite badly he stutters does not come over 30kmh on straight track and is just before drinking. So he has also often run out of gas to give me. When I drive down the mountain he pulls up and drives normally around the 55kmh I ask for your help. Thank you very much.