My son rides an 08 KX 65 with a Berg auto clutch in it. The bike just rips and the Berg unit works awesome....until yesterday. He pulled off the track saying his bike is running weird....then the rear wheel locked up. The bike won't run in gear, as soon as it's put in gear there's a clunk and then it dies. The bike runs in neutral though, I haven't found anything negative online about the Berg auto clutch, just the opposite it's supposed to be very durable and very reliable. If I need parts for it where do I get them?