Contains 80 papers presented at the Small Engine Technology Conference in Madison, Wisconsin on September 28-30, 1999. Contents include: Design and Simulation of Engines: A Century of Progress Motorcycle Engines: Past, Present, and Future Three-Way Catalyst Technology for Off-Road Equipment Engines A Study of Rotary Valve for a Single Cylinder Engine Best Available Technology for Emission Reduction of Small 4S-SI Engines The Effect of High Ethanol Blends on Emissions from Small Utility Engines Authors included professionals from: MTS Systems Corp.; Mercury Marine; Robert Bosch Corp.; Fuji Heavy Industries, Ltd.; Yamaha Motor Co., Ltd.; BKM, Inc.; Honda Racing Corp.; Suzuki Motor Corp.