NEED HELP!

I just bought a 2008 grizzly 700 about a week ago. I rode it for about 30 minutes and it started smoking pretty bad. It still had all the power than it had before. I’m not sure what I need to do to get this fixed.im pretty sure it’s burning oil because it smells like it. It’s DOESNT smoke at idle whatsoever only when you get into to it a good bit. I’m new to this forum and hope to hear from you!