When hand pushing the oil bubble, single valve outlet air from the oil resistant rubber, back to the fuel tank, and air flow from the fuel tank.Rubber cover began to recover at the same time, to produce negative pressure, the rubber cover shaped cavity suction hole inhale, quantitative chamber rubber skin sucked in urban edge, compression spring, the valve stem oil valve lift, oil gas began to flow into the tubing at this moment, the oil pump rooms filtered into quantitative room, single valve shunts after copper collar, in part by the idle speed screw adjusting control of the bore idle speed, low speed, a spray gasoline.The other part into the high-speed screw adjusting control of main nozzle, can appear more atomized gas.When closing the choke can start the engine.
Engine work, carburetor oil pump room has a side back to porosity, the pass-through crankcase, when crankshaft around a circle, as the piston moves up and down, the gases in the piston in and out of the pores, even following the carburetor oil pump chamber diaphragm vibration.Due to the effect of air flow, accelerated the feed velocity, accelerate the speed of oil, and at the same time start the quantitative chamber diaphragm vibration, the vibration of the quantitative chamber diaphragm compression reeds, carburetor start oil absorption, shunt, injection.
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