Honda CB125 CB160 (1972) [93/139] Refer to fig 5 25

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5 3 IGNITION CIRCUIT E Spark advancer The angle advancing mechanism automatically acce lerates ignition timing in accordance to an increase of engine rotation This is performed by a device fixed by a screw and adjusted by a wire In the latter case adjustment is performed by changing the position of the breaker arm When the positions of the cam and breaker arm are changed adjustment is obtained That is when the breaker arm is fixed the cam moves correspondingly to the number of rotations In the CB 125 and CB 160 spark the cam is moved by utilizing centrifugal force Refer to Fig 5 25 As shown in Fig 5 26 the spark advance mecha nism is fixed by a spring at a position of 0 angle advance 5 prior to top dead center However corresponding to rotation the weight opens outward resisting the tension of the spring by centrifugal force thereby rotating the cam The rotating direction ac celerated by the spark time The doffed line in Fig 5 26 illustrates the full advanced position The advance angle of the spark advance mechanism opens at 1600 r p m and is re leased at approximately 4200 r p m The angle ad vanced is from 5 to 45 Refer to Fig 5 26 In Model CB 125 and CB 160 the spark advance mechanism is included in the camshaft Only the point cam is exposed at the point section which makes visual inspection of the advance mechanism difficult However it is necessary to inspect and insure correct operation of the weight by turning the point cam rotor Angle advance starts crank r p m Angle advance ends crank r p m 1600 r p m 4200 r p m Fig 5 27 Graph of advanced angle of spark advancer Advanced angle 40 1 Maintenance and replacement In the spark advance mechanism the centrifugal piece spring hook hole and the coupling section of the cam are worn after prolonged use causing in creased play These are indicated in a totally com bined status an advance characteristic The spark advance mechanism should be replaced if the following is noted A range deviation Generation of noise Rough advance curve 87

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