I did exactly what Val did an taught four kids one summer, including my four year old an a nine year old with some undiagnosed obvious issues. The trick is to use a bike that is too small. They don't peddle and they coast down a slight ramp. I always had them end in the grass jut incase. When coasting was easy, I had them try to peddle small bike. This always worked. When my four year old was ready I took off one training wheel. She rode her bike fo a week like that and then decided that the remaining wheel was in her way and asked me to take it off. Good luck. The child I taught to ride with the issues still doesn't ride very well. Her parents don't bring her often and she needed a lot of practice.
