Honda CB125 CB160 (1972) [115/139] Caution

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5 6 SAFETY PARTS Construction of the speedometer is shown in Fig 5 101 Magnet rotation corresponds to the number of rotations of the inner cable The induction plate constructed of aluminum or copper moves together with the pointer the magnetic shield plate is em ployed for generating the magnetic field which causes the rotating magnet to produce eddy currents at the induction plate It is moved by the rotation force corresponding to the magnet by the eddy currents and the indication on the point of the seal at which it balances the reaction force of the correctly ad Fig 5 101 Principle of speedometer justed hair spring is read When the vehicle stops at the rotation gauge operation stops the pointer and the induction plate are returned to zero by force of the hair spring Refer to Fig 5 101 Gear box The gear box is a single unit with the front wheel hub cover and is installed at the right side of the front wheel hub It drives the speedometer through the inner portion of the speedometer cable The gear ratio is designated so that when the vehicle runs 1 km the inner portion of the speedometer cable performs 1 400 rotations The ratio should Fig 5 102 Gear box complete change according to tire size Refer to Fig 5 102 Speedometer for Model CB 125 and CB 160 Counter integration at 1 400 rotation per 1 km In order to remove the speedometer assembly from the body after removing the head lamp remove the joint of the meter cable and then remove the meter fitting spring from the speedometer bulb socket or coupling section Inspection and assembly a When glass is broken the interior stained or the pointer damaged the meter should be replaced Standard for operating safety Speedometer error should be less than 15 posi tive and 10 negative Speedometer deflection should be below 3 km 1 86 mi both in positive and negative directions CAUTION a Instrument lamp 12 V 3 W 2 each b Do not handling strike or drop the speedometer when Fig 5 103 Replacement values for speedometer repair 109

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