anything but a polaris...they aint nothing but a money pit
x2..................don't know about now but the older ones were trash...
as a young man I had kawasaki and honda motor cycles and couldn't tear them up...
I owned a 1995 kawasaki 400 4x4 and couldn't tear it up. now have a 2000 suzuki 500 4x4 and only had carburator problems with it. I bought both new... But I use an oil additive called "MILITEC 1" when I change the oil.
Carb problems has more to do with the ethonal in the gas and this was told to me by the small engine mechanic.