Honda CB125 CB160 (1972) [55/139] Refer to fig 3 40

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3 13 CARBURETOR 4 Jet needle The jet needle with the needle jet adjusts the mixture ratio at mid throttle The jet needle with a long taper section is float fitted at the center hole of the throttle valve and the taper at the tip enters the needle jet According to the position of the throttle valve the flow amount fuel is increased or decreased through the taper and a suitable flow amount a suitable mixture is obtained The jet needle has five grooves for positioning Lowering the posi tion from the first step to the fifth density of the mixture becomes heavier Refer to Fig 3 140 5 Throttle valve The throttle valve adjusts the air fed to the engine for setting speed and output In addition it also adjusts the mixture There is a cutaway at the air intake side of the throttle valve and by changing the size of the cutaway number the negative pressure is changed the fuel flow and mixture ratio is changed However the cutaway range covers mainly from idling to around 1 4 throttle with little influence above 1 2 throttle Refer to Fig 3 141 Fig 3 141 Throttle valve 6 Slow speed jet The slow speed jet controls the fuel flow at idling and low throttle and produces a mixture with the air coming from the air breeding hole it vaporizes the fuel Refer to Fig 3 142 7 Air screw The air screw controls the air flow entering the slow speed system By adjusting air mixed in fuel coming from the slow speed jet it produces a proper mixture and ejects the mixture from the tip of the slow speed jet Refer to Fig 3 143 Fig 3 143 Air screw 49

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