Honda CB125 CB160 (1972) [57/139] Refer to fig 3 46

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3 13 CARBURETOR 3 Adjustment at low speed The mixture covers the range from 1 8 throttle to idling Adjustment is made by the air screw cutaway and the throttle valve Refer to Fig 3 146 a Air screw Adjustment of the mixture at idling is made by the air screw If the screw is turned clockwise the mixture becomes heavier if the screw is turned counter clockwise the mixture becomes thinner However the adjustment of the air screw should be made with attention directed not only to idling but also to starting and acceleration Also Fig 3 146 Adjusting air screw observe running performance in relation to density of the mixture at the point where the throttly open b Throttle valve cutaway Near 1 8 throttle the density of the mixture sometimes cannot be compensated by only the air screw In such case if the mixture is too heavy a valve with a large cutaway number should be employed or vice versa Thus adjustment of the air screw is obtained In CB 125 and 160 replacement of the screw valve is not required since the cutaway is com pletely adjusted 4 Adjustment of standard fuel level As shown in Fig 3 145 the fuel level is esta blished at height h from the main bore bottom it is different for every engine It is rather difficult to measure the actual fuel level Hence this is determined by the float height Ad justment of float Refer to Fig 3 147 a The carburetor should be turned upside down and slid horizontally b By pushing the float vertically and lightly with the tip of a finger find the position where the tip of the float valve and the float arm contact slightly c The difference between the height of the tip of the float and that of the carburetor body is equal to h If this height is not acceptable adjustment should be obtained by carefully bending the float arm h of Pw22 19 5 mm 78 Fig 3 147 Measuring standard fuel level 51

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