runs exelent , fiers up on 1st or second pull , back tier needs air , i do not have a pump or it would have air in it, i bought it for my litttle brother but when i bought it i relized this thing is way to fast for a 6 year old , it goes 40 just with me on it i way 135 pounds , 2 stroke power band , eletric kill switch , i payed 300 for it and i got to get my money back out of it , cnt go any less