How is the flywheel attached to the crankshaft?

The flywheel is typically designed to mount onto the crankshaft via a tapered end. This tapered design allows for a snug fit that secures the flywheel in place without the need for additional fasteners or adhesives. When the flywheel is pushed onto the tapered portion of the crankshaft, it effectively creates a wedge that holds it tightly against the shoulder of the crankshaft. This not only simplifies the assembly process but also ensures a reliable connection that can withstand the forces and vibrations produced during engine operation.

In contrast, methods like gluing or welding would not provide the necessary durability or ease of disassembly for maintenance. Using a bolt and nut, while functional in some applications, is not the standard method for securing a flywheel to a crankshaft in small engines, primarily due to space constraints and the need for precise alignment in high-speed conditions. The tapered design is thus favored for its efficiency and effectiveness in securing the flywheel during operation.