13’ HDX 700 @ 2600 hours no problem or noises. Hadn’t ridden in couple weeks let it warm a few minutes took off after got to 20 mph noticed engine little louder than normal guess turning few more rpm’s at that speed. Started down incline noticed kinda freewheeling no engine braking , went back up incline just quit pulling , no noise at all but smelt a slight burning smell. Pulled it back home, is this what a drive belt would do when goes out? Thx