2011 Grizzly 350 4×4 IRS Top Speed/Auto Question

Hey guys, I just bought an immaculate 2011 Grizzly garage kept machine with 265 miles. It has a few scratches but looks like it’s never seen any mud, everything is stock including the tires. I’ve never ridden an automatic ATV of any make until now. The top speed on this 350 is about 42 but even at lower speeds it sounds like its working too hard. The only thing I can compare the sound to is a 5 speed utility 4 stroke ATV that you need to up-shift to a taller gear. It doesn’t sound like its running wide open all the time, just that its working too hard for the speed its going. Any thoughts?