John, you have some good in the posts above here. It could be a problem with the neck bearings but that usually doesn't suddly come in at 20 mph (anything is possible though).I have a friend who has a 1200 goldwing I believe its a 1982. He says that if he goes over 20 mph he can't steer it anymore it locks up. I have changed the wheel bearings and wonder if anyone has had any exp. in this problem.