Bought two 49cc 4 wheelers for my 7 and 10 year old sons. The 10 year old's runs good - no problems at all. The automotive parts store where they were purchased said the "guys in the back" loved that little 4 wheeler. When they first came in they checked it out and rode it all over the place. The 7 year olds 4 wheeler has had problems from the minute we brought it home. We don't live on a big farm, we have two acres of lawn for them to ride on. The third time he rode it the bar to which the safety switch is attached fell... read full review »