About this item High Simulation: This Engine Model boasts a realistic appearance with red sports elements, resembling a true engine, providing an immersive experience. DIY Assembly: Enjoy fun and educational DIY assembly while learning the internal structure and mechanical operation principles of the Engine Model. Wide Applications: Compatible with a gearbox, this Engine Model is ideal for mechanical artware, teaching demonstrations, and as a gift for mechanical engine enthusiasts. Dual Synchronous Belt: With a timing structure featuring dual synchronous belt pulleys, this Engine Model operates at high-speeds with low risk of gear jumping. Powerful Features: With an asynchronous crankshaft structure, short rocker arm, and brand-new signal carburetor, this Engine Model provides powerful, smoother, and more sensitive throttle respons