Honda CB125 CB160 (1972) [110/139] Refer to figs 5 2 and 5 83

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5 ELECTRICAL PARTS 104 1 When the starting motor rotates a When the starting chain is drawn in the direction of the arrow dotted line b When the sprocket rotates and the roller moves to the starting sprocket the narrow section of the outer clutch is engaged and the outer clutch rotates Therefore the generator rotor coupled with the outer as a unit rotates c As the rotor is fixed to the crankshaft by a 4 mm 16 04z J key rotation of the outer clutch is transmitted to the crankshaft Fig 5 81 Parts of starting clutch d The starting clutch roller spring is employed for smooth operation of the roller and to insure correct engagement For additional smoothness of the roller spring and roller a spring cap is employed 2 When the engine starts a Rotation of the crankshaft exceeds that of the sprocket b By centrifugal force and friction the roller depresses the spring and moves to the wide section of the outer clutch transmission of the starting motor is disconnected Fig 5 82 Al Principle of starting clutch operation 3 Lubrication In lubrication of the overrun clutch oil applied at the position shown in Fig 5 75 A passes the three grooves shown in Fig 5 74 B and is applied to the interior of the oil seal which prevents seizure Therefore lubricating positions A and Bl must be cleaned by employing compressed air upon disassembly Refer to Figs 5 82 and 5 83 4 Caution required during maintenance Life of the starting clutch depends on operation of Fig 5 83 Bl Principle of starting clutch operation the roller Hence the starting clutch should be handled with care Part name No Q ty No Part name Q ty When a new coupling is installed a Special grease for the roller Part number 719111 1 Starling chain 1 9 Woodruff key 1 2 Starling sprocket 1 10 Right crankshaft 1 silicon grease should be applied The designated 20 mm bushing 1 grease provides features such as high cold and heat 20305 oil seal 1 3 Rollers 3 II 4 Clutch center 1 12 5 Starting clutch roller spring cap 6 3 13 3 14 7 A C dynamo rotor 1 15 8 Pan head screw 3 Starting clutch roller spring 326275 oil seal Z bearing Right crankshaft bearing housing Fig 5 84 Principle of starting clutch operation 1 resistance 40 C to 200 C and small deviation of the friction coefficient at the applied metallic surface due to temperature etc Clean all parts 1 with gasoline and apply a thin coat of lubricant 1 to the roller In reassembly this application is not necessary

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