My quad will idle fine for a while but after it has run for a 1 /2 hour or so it revs up too fast. It is even difficult to shift it into neutral because it is revved so high. I know there has to be an adjustment for the carb but I don't know where it is. Does anybody have a manual that they can share a look at or at least describe where the adjustment screw is?

 

My quad did the same thing, the only thing I had to do was rip the carb off and use a whole can of carb cleaner on it. Never rev'ed up like that again.