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This is a new scooter (Chinese Horizon 4 stroke gy6) scootet that I origanally purchased for my nephew to have job transportation but he did not want to look for a job. Long story short no job...no scooter. I bought it in September 2014 but it stayed in the garrage until november when I started test driving. I has about 45 miles on it now. There is a problem at times during takeoff. At times it takes off nice and smooth but twice it has surged on me quite strongly. The second time i was in my parking lot and was going too slow to make the curve to my garrage so i gave it a little gas and it jumped away from under me. Each time that this has happened I had just taken it up to first 45mph and then 75mph. I don't know if that helps or not. Can anyone tell me what may be going on? Thanks Nsain.