We have got a suzuki 50cc quad .... had it for about 10-11 years now , flogged the crap out it , my young bloke started to ride it by himself at around 5-6 , flogged it around as his confindence grew , dragged me around heaps as well ,, never missed a beat , my little 5 year daughter now rides it .
We also have a 70-75 cc honda 2 wheeler for when the young bloke grew sick of the quad , it abouts 4 years old , never misses a beat .
We had a import 90cc quad that was a piece of crap , ride it once , fix it , ride it again , fix it .... I buried it .