Honda CB125 CB160 (1972) [54/139] Refer to fig 3 137

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48 3 ENGINE 3 Float chamber As previously stated the carburetor produces mixed gas suitable by opening and closing the throttle for all speeds of the engine Hence it is necessary to keep the fuel level constant the float chamber plays this role Fuel fed from the tank passes through the passage between valve and enters the float chamber The float becomes buoyant as fuel enters and pushes up the valve through the float arm when the valve contacts the valve seat the flow of fuel stops When the level decreases due to consumption of fuel the float drops corresponding to the change and the valve opens for allowing fuel to enter the float chamber By repeating this operation the fuel level is held constant Refer to Fig 3 136 4 Choke As shown in the figure the choke valve closes at the position where the choke lever is pushed up and opens at the position where the choke lever is lowered Refer to Fig 3 137 Fig 3 137 Choke B Operation of component parts 1 Main jet The main purpose of this unit allows adjustment of the mixture ratio by controlling the flow of fuel with the throttle fully opened However the jet influences the mixture ratio not only at full throttle but also at other points Refer to Fig 3 138 2 Air jet For insuring that the mixed gas does not become Fig 3 138 Main jet excessively heavy at fully throttle and high speed and that it does not become excessively thin at redu ced throttle and low speed bleeding air is fed into the needle jet holder The air jet controls this amount of air At a certain throttlle opening a larger air jet produces a smaller difference of fuel flow between high and low speed the flow decreases 3 Needle jet This unit readjusts the adjusted fuel by the main jet at full throttle and medium speed Adjustment is simultaneously performed with that of the needle jet The hole diameter is highly precise Refer to Fig 3 139

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