Honda CB125 CB160 (1972) [124/139] Refer to fig 6 19

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118 6 INSPECTION AND MAINTENANCE f The plug is next tested with a spark plug tester Sparking may be observed by using operating voltage 5 Fuel Supply If the fuel system is plugged or the carburetor does not function the engine will stall when acce lerated a Tools required Refer to Fig 6 17 b Remove the fuel line from the carburetor and examine Fig 6 17 Tools required to inspect the fuel system the flow when the fuel pet cock is turned on Refer to Fig 6 18 c Check the tank d If the flow of fuel was slow dismount the tank and clean If fuel flow is still slow disas semble the pet cock and clean NOTE 1 Check the tank cap There is a small airvent which sometimes becomes plugged If this vent is plugged it will cause the flow of gas to be slow 2 The fuel operation exhausted Fig 6 18 ON and RES positions of fuel tank pet cock reserve when may the There is be regular enough used fuel during supply fuel in vehicle becomes the reserve tank for about 100 km Turn the switch from ON to RES to operate 6 Carburetor Cleaning and Adjustment If the carburetor is dirty or not functioning correctly the engine performance will decrease Periodical cleaning and adjustment are necessary a Tools required for cleaning and adjustment of carburetor Refer to Fig 6 19 b Remove the throttle cable air cleaner line and fuel line c Remove any other connection of the carburetor Fig 6 19 Tools required for cleaning and adjustment d Remove the 6 mm nuts which mount the carbu of the carburetor retor e Disassemble and clean with gasoline f Clean all jets with compressed air Dry and reassemble all parts Remount the carburetor g Idling adjustment 1 Turn the limit screw until the strength of both exhausts becomes the same Speed of the engine should 6 20 Fig 6 20 Carburetor be 1000 to 1200r p m Refer to Fig

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