Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 133Get this manual
TYPE III CARBURETOR justrnent, Return the engine to idle speedIf the engine coughs and operates as if the fuel is too lean, but the idle and high-speed adjustments have been correctly made, then recheck the synchronization between the fuel and ignition systemsNow, shut off the fuel supply and allow the engine to run until it first begins to misfire from lack of fuelRetard the spark and shut the engine downTighten the sleeve nut securely to prevent the needle valves from changing position through engine vibration while it is operating, but still allow the needle valves to be adjusted by hand using the knob on the end of the valveThe idle stop is located on the port side of the engine, on the outside of the cowlingAdjust the nylon screw inward or outward to obtain the desired idle speed4-10 TYPE III CARBURETOR This carburetor is installed on the 9-12 hp engineThe unit has an adjustable lowspeed needle valve and fixed high-speed needle valveThe only changes that have been made to this particular model carburetor over the years was redesign of the idle needle valvesOn early model 9.5 hp engines, the reeds set directly below the carburetorOn later models, the reeds were removed from this location and installed between the engine block and the intake manifold 4-43