Honda CB350 CL350 [67/219] 3 engine

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56 3 ENGINE III Float system The carburetor must provide a proper mixture of fuel at different throttle openings and engine speeds In order to accomplish this the fuel level in the carburetor must be maintained constant The float functions to serve this purpose The fuel from the tank enters the float chamber through the fuel passage between the valve seat and valve and fills the chamber to the level where the float rises to shut off the flow of the fuel by seating the valve against the valve seat by the action of the float arm As the fuel is consumed the fuel level drops in the float chamber the float will follow the fuel level and the fuel will start to enter the chamber between the opening of the valve and valve seat to maintain a constant fuel level This sequence is recycled to maintain a constant fuel level A spring is incorporated in the valve and which comes in contact with the float arm this design is to prevent the vibration of the valve IV Choke For starting in cold weather a rich fuel mixture is momentarily required to serve this purpose a choke valve is incorporated in the carburetor The choke valve is closed by lowering the choke lever by so doing the air flow is restricted and the fuel that is discharged from the needle jet is taken into the engine in a rich mixture Further a relief valve is incorporated in the choke valve so that the choke lever may be left in the lowered position for starting and returned to the normal position only after the engine warms up to operating temperature Operation and Adjustment 1 Idling r h Fig 3 118 Sectional view of carburetor SOriC Set the throttle valve so that it is practically closed the fuel w ill then be drawn from the t jr i l Cpilot outlet The fuel mixture adjustment is made by turning fl pilot screw Turning the screw out will give a rich mixture For normal adjustment turn the screw all the way A in ar d back off by the same amount for both carburetors When making the final adjustment within to turn of the specified setting j ft

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