I have a 2002 Mule 3000, I like it for working around the farm.  This last weekend went and bought an '08 Teryx LE.  The carbs seem to work just fine I can get 50 mph before it hits the rev limiter.  Still breaking it in I don't want to beat on it yet!  I live in northern Michigan we get all four seasons, carbs always seem to work fine.