rumbling noise

took my 900 out over the holiday for the first time. 2011 xp900. It developed a low pitch rumbling noise after about 30 miles. One ride was 68 miles next one was 114 miles now it does this all the time along with a vibration. This is my first Polaris machine so I am not familiar with them. Going to start chasing things this week. Any suggestions? Thanks in advance.