Thanks for taking time to read through this. We purchased a WC4 in April. We live in Central Florida. We do mostly gravel/sand trail riding. Not the suck you tire spinning sand but the cruise along with no effort at 20 to 30 mph sand. Also a little mud but again not mud up to the floor boards need to be winched out mud. We usually have our daughters with us so its more leisure riding. We had about 70 hrs and 372 miles on our Cat when we first experienced severe bucking. Though it was something in the clutch so we loaded it up and took it to our local Cat dealer. They have ONLY EVER had our WC4 in stock. They have only sold ours. Ours was the first they have ever worked on. They have sold a ton of the two seaters. They also thought it was something in the clutch. After 3 weeks and a "complete tear down" (their words) they found nothing wrong except a worn belt. $420 repair bill. Over the next 5 weeks we went a total of 23 miles before the severe jerking returned. We broke it in as they asked driving at around half throttle for short periods of time and allowing time for it to cool down. We were upset and took it back to them. A MONTH later and again they say nothing but a bad belt. And they are claiming it was how it was broken in. Again it is fixed. Now Arctic Cat AND our dealer are saying the WC4 is designed to be driven mostly in LOW and only OCCASIONALLY in high. Their words were "High is considered overdrive". So they are claiming my big bad Cat is suppose to be driven around at 10 to 15 mph all the time. Sounds funny to us. Does anyone have any experience with problems like this? I really don't want to be changing belts every 30 miles. Any suggestions would be great......