Fuel filters are not a common item on any carbed ATV I am aware of. I always add one, though I've gotten by for years running them without….
As a kid I had a 1981 Honda ATC 110 three wheeler. It had a fine mesh screen behind the fuel selector valve that filtered any gas coming through it. Something like that would have kept the crud out of my carb. I haven't messed with the fuel delivery systems on any other ATV's so I didn't know other makers didn't use fuel filters also. It's amazing what some companies will do to save a couple of bucks.
