The A-M-A Pro Flat Track motorcycle races at the Knoxville Raceway were rained out yesterday. Continued rain during the day caused officials to scrap the events for Saturday. They will try again today with spectator gates opening at noon. Officials will see how the weather is going and announce a time when racing will start. Knoxville Raceway Officials says that over 100 bikes are expected to be in Knoxville for the racing action.