Suzuki - 4-Stroke Service Manual - DF9.9B / DF15A / DF20A - 99500-89L00-01E. Use this original Suzuki service manual to service applicable 4-stroke Suzuki outboard engine models. A comprehensive companion for any engine rebuild or maintenance task, this service manual includes engine specifications and step-by-step service procedures. Applies to the following Suzuki 4-stroke outboard models: DF 9.9B - All Model Years DF 15A - All Model Years DF 20A - All Model Years