I am breaking in my new 2014 Grizzly 550. It seems that when cruising at approx. 12-17 MPH under light load on level surfaces there is a kind of vibration/roughness/ light knocking noise somewhere in the cvt or engine. If I give it a little gas or leave off the gas it goes away. Other than that everything is going smooth. This thing sure cruises at a lot higher rpm that my Honda Rubicon does and just seems noisy at times. I guess I just have to get used to it. Has anyone else experienced the roughness I am talking about. Hopefully it will get better with more miles on it. I am at 6.5 hours and 60 miles so far.