Answer:
In a flywheel, most of the mass is concentrated at its rim. So it has a large moment of inertia. Any change of angular momentum imparted to the wheel by the piston results in a lesser change of angular velocity(\[L=I\omega \] or \[\omega =L/I\text{ }\]). Moreover, a flywheel stores a large amount of rotational energy\[(\frac{1}{2}I{{\omega }^{2}})\]. This helps the wheel c fly off the dead point.
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