This gasoline engine model is designed for middle school physics experiments to provide a clear, handson way to teach mechanical principles and internal combustion fundamentals. Its realistic design and working components make it a practical teaching instrument for classrooms and science labs. Key benefits Makes abstract concepts concrete by showing a working 4stroke singlecylinder engine in motion. Supports active learning with both manual operation for student interaction and batterypowered operation for continuous demonstrations. Saves teacher preparation time with a fully assembled, plugandplay design. Enhances student understanding of how fuel, air, and spark interact to produce motion through direct observation of engine cycles. Main features Demonstrates the structure and working principle of a 4stroke singlecylinder gasoline engine. Clear visual representation of intake, compression, power, and exhaust strokes for classroom explanation. Two operation modes: manual for handson exploration and battery powered for automated demonstrations. Requires 2 AA batteries, not included. Delivered fully assembled for immediate use and easy classroom integration. Suitable for middle school physics curriculum and science lab activities. Practical applications Classroom demonstration: Teacherled explanation of internal combustion cycles during a physics lesson. Lab activity: Small group investigation and guided experiments where students operate the model manually to explore cause and effect. STEM club or science fair: Portable, readytouse display to illustrate engine mechanics and spark ignition principles. This model offers a straightforward, reliable way to bring engine mechanics into middle school instruction, helping students visualize and understand core mechanical and thermodynamic concepts without complex setup.