well i might sell my yz125 to get me a used yz250f. my yz125 is fast and all but i t just keeps on fouling plugs. and i just want to change my riding type to four stroke. first off.. are four strokes more dependable? are they faster? are they lighter? are they easier to maintain than the yz125 2 strokes?? i need your opinions. have any one traded from a yz 2 stroke to a 4stroke and evr regret it??