Honda CB125 CB160 (1972) [91/139] Refer to

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85 5 3 IGNITION CIRCUIT The breaker point consists of the breaker arm points movable contact point and fixed contact point primary connecting terminal spring and oil felt coupled on the base The breaker arm is of bakelite including rag In some cases thin iron sheet press worked products with a bakelite contact point cam follow at an end are employed To either type movable contact point and other contact points are applied at the ends and are insulated at the base Refer to Fig 5 17 The breaker arm performs light motion and in order to decrease inertia it must be compact lightweight and rigid In order to prevent chattering at the time of breaker point shorting spring pressure must be sufficient How ever in order to prevent deviation of spark time to sliding section wear of the contactor spring force must be limited to some extent Spring force gene INSULATION RESISTANCE rally ranges from 700 to 900 g at the contact point MORE THAN IMil POINT MATERIAL Refer to Fig 5 18 1 5 to 1 981b TUNGSTEN Fig 5 18 Breaker arm and spring In order to prevent wear at the sliding section of Service Values the breaker arm grease is applied to the oil felt on the base the axis oil groove and the arm lubricator Point pressure When less than 600g at lowest value Inspection and lubrication is required upon disassembly Refer to Fig 5 19 Point gap When impossible to adjust the gap in the range of 0 25 to 0 4 after Lubricant to employ using the spark advancer to cor rect the timing For the contact point of general automotive vehicles Insulation tungsten material is widely used and for the race resistance When less than 1 Mil with a soft platinum with superior conductivity is occasionally 500 V or more megger employed Refer to Fig 5 20 Contact point requirements Fig 5 19 Value for maintenance and replacement of breaker point 1 It should be wear resistant 2 It should be heat conductive 3 It should have 2 sufficient melting points 4 It should provide oxidation resistance 5 It should not be easily influenced by water or oil 6 It should possess sufficient hardness The point cams of Model CB 125 and CB 160 are set to the left of the camshaft Both cams are coupled to the profile spark advancer and simul taneous spark system by the employment of one breaker point which means that one of the two cylinders is released in a nonfunctional status Fig 5 20 Breaker point

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