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S2 (1972-1973)
Инструкция по эксплуатации Страница: 53

Kawasaki S2 (1972-1973) Инструкция по эксплуатации онлайн [53/129] 114654

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c Starter System The purpose of this system is to enable easy starting when the engine is cold and replaces the choke system found on 4 cycle or old style 2 cycle engines The engine is started with the throttle fully closed and the starter lever pushed completely down With the lever pushed starter plunger is pulled up Fuel is drawn up through the starter jet by the negative intake pressure and mixes with air that conies from the float chamber IJi via the air bleed opening O It is then mixed with the air from the starter primary air passage and jetted through the hole in the rear of the throttle valve into the main bore Here it supplements the main fuel mixture supply from the pilot system and is drawn into the engine 2 Functional Parts a Throttle Valve The throttle valve controls the rate of engine air intake by moving up and down inside the main bore At small throttle openings air flow control is performed chiefly by the cutaway in the valve and by controlling air flow the negative pressure over the needle valve is regulated in turn governing fuel intake The throttle valves are numbered 1 0 1 5 2 0 etc according io the size of the cutaway the higher the number the leaner the gasoline air mixture d Float Mechanism The float needle valve f and valve seat i1 make up the float mechanism whose purpose is to maintain a constant fuel level in the float chamber by metering the gasoline from the fuel lank As in the case of a hand pumped bug sprayer when the fluid level in the sprayer reservoir or float chamber is low the same amount of pumping will not yield the same amount of spray out as when the reservoir is full Therefore to retain the same fuel flow rate for a given set of conditions the fuel level in the float chamber must be kept constant When the fuel level in the float chamber rises the float also rises and closes the float valve stopping fuel intake from the tank When the level dips below normal the float lowers and opens the float valve more than normal temporarily increasing fuel How from the tank until the b Air Jet The air jet measures the air sent to the needle jet for mixing NOTE The air jet which is driven into the carburetor body cannot be removed without damaging the carburetor and is therefore not a replaceable part c Main Jet The fuel necessary for making the proper mixture is measured by the main jet and as the throttle opening grows larger has a great influence on mixture ratio The number stamped on the jet indicates the amount of fuel in cc s that passes through the jet in one minute under a given set of conditions Since the numbers vary with the type of jet the table shows equivalent jets for the tliree types used on various models

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