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An inertia type starter motor

An inertia type starter motor Terminal post Heavy lead to battery Brushes Armature Field coil Shaft Pinion Bendix gear

An inertia-type starter motor is fitted with a Bendix gear on the shaft from the armature. When the started switch is turned on, the motor rotates rapidly, the shaft turns, and the Bendix gear screws the pinion along a thread until it engages with they flywheel ring gear on the engine.