Honda CB125 CB160 (1972) [97/139] Refer to fig

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91 5 4 POWER SOURCE CIRCUIT 5 4 Power source circuit A AC generator The generating principle of an AC generator is the same as that of the generator coil of the flyweel magneto By one turn of the magnetic steel the flux in the iron core changes the direction as many times as the number of magnetic poles That is at one rotation of the magnetic steel the flux in the coil iron core changes as many times as the number of magnetic poles 2 cycles Therefore in accordance to this change AC voltage is generated at the gen erating coil Magnetic force changes Fig 5 39 AC generator correspondingly with the direction of flux in the iron core the greater the number of magnetic rotations the number of poles or the number of coil windings the greater will be the amount of generated voltage If the magnetic force number of magnetic poles or the number of coil windings is increased a reduction must also exist Refer to Fig 5 39 A merit of the AC generator is that malfunction rarely occurs due to the fact that simple construction parts subject to wear are not employed The feature of coupling the AC generator and ignition coil is for Fig 5 40 AC generator construction emergency start this is impossible with a DC gen erator As batteries with low capacity are employed in motorcycles battery pletely discharged power is occasionally due to carelessness SPECIFICATIONS Primary current Locked under normal temperature less than 3A at 12 V com in handling Crankshaft at 10 000 rpm less than 0 6A at 12V Spark capability More than 7mm at 300 rpm Battery 8VI spark In the battery ignition system sparking is not obtained More than 7 mm at 10 000 rpm Battery 12 V until the battery is re charged or replaced However spark with AC generators a large induced voltage is ob For measurenlent the high tension lead on one side Is grounded through a 1 mm gap and the high tained during a lightly loaded period and by feeding tension lead of the other side is connected to a this voltage to the ignition coil through a rectifier sparks are obtained at the plug even when the battery is completely discharged by using the kick starting system This system is called an emergency start 3 gap Note Use the high tension lead black and white on the spark side and connect to the left cylinder plug Fig 5 41 Specifications of AC generator system with circuit switching being performed by the combination switch On the other hand demerits of the AC generator flywheel magneto generating coil of magneto is that voltage regulation is insufficient and when a load ex ceeding the designated value exists an excessive in crease or decrease of voltage is generated Attenuation of magnetic force does not occur during normal usé Hence the vehicle will not be rendered unusable due to such attenuation Even if magnetic force is attenuated due to accident design allows for re magnetizing Refer to Fig 5 Fig 5 42 AC generator installed on engine

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