One of my friends has two Grizzlies. Only one of them was out today. In about 2 1/2 feet of water it ran fine. When it came out of the hole and turned, it made an intermittent, high-pitched noise. At first, it sounded like metal on metal. And, when it happened it only did it for maybe 5 seconds total and during those 5 seconds, it only it for maybe a 1/2 second at a time. The bike ran fine and he had no problems in riding. I just wondered if that was the belt being a little wet or if it may have been the belt slipping against metal? He is running 27x12 Vamps on this one.