I just recently purchased a used 2014 raptor 700. It has the big 3 mods and is widened to 49 inches. When I first started riding it, it would make a sound like the chain was too loose every few minutes. Over the course of an hour, it started happening more and more until finally there would be a serious chain skipping sound. I finally figured out that the front sprocket was totally worn down to the point where there was no teeth, just smooth bumps. Is this common and where can I get a better sprocket to keep this from happening?