(1) Adjustment of the oil level in the float chamber and maintenance of the float When checking and adjusting the oil level of the float chamber, the engine should be idled and the temperature should be normal. Adjust with the oil level adjustment screw, screw in, the oil level rises; the screw exits, the oil level drops. To reduce the adjustment of the oil surface, observe the observation that the excessive fuel in the original float chamber is consumed. The normal oil level should be in the center of the round glass window. If you want to change the oil level. When adjusting the screw, if the oil surface is not moving, it may be stuck on the float shaft or float, and the float is broken. The float should be disassembled and checked for damage, such as dents, oil leakage, etc. (2) Inspection of the triangular needle valve and the needle valve seat When the engine is running, it suddenly smells a pungent odor of oil and feels that the power is insufficient. When you open the hood, you will find that there is a lot of gasoline spillage around the carburetor. This fault is caused by the dirty needle valve seat or the needle stuck so that it cannot seal. Immediately tap the carburetor cover with the screwdriver's wooden handle. Dirty things off or triangle needle valve back. If the triangular needle valve is not tight, the needle valve can be placed in the valve seat, lightly tapping the needle valve with a wooden handle with a screwdriver, and then pressing against the needle to force the twisting valve, if not tight, can be painted a little The valve sand is ground, and it is better to add a little of the engine oil to refine it and seal it. When checking whether the triangular needle valve is tightly closed, the general method is to place the needle valve in the needle valve seat to reverse the carburetor float chamber cover so that the needle valve and the float sink under the action of their own weight and come into contact with the valve seat. shut down. Then use your mouth to suck in the tubing head. Before sucking without slowing down, plug the tip of the inlet pipe with the tip of the tongue and if it feels suction on the tip of the tongue, it indicates that it is in good condition. Otherwise, the needle valve and valve seat should be worn or replaced. Note that tetraethyl lead is added to vehicle gasoline. This substance is poisonous and must be cleaned before it can be checked by this method. The opening time of the sub-chamber air door has been adjusted at the factory and generally does not need to be adjusted during use. However, if there is a change in the operating time, an excessive engine failure will occur and acceleration will fail. That is, the air door will open too early; if the power is insufficient, the air door opening time will be too late. When adjusting, first remove the air door subassembly from the carburetor, then loosen the top wire a little and do not loosen it completely to maintain the original stiffness of the torsion spring. If the opening time of the air door is too late, the torsion spring can be loosened in the direction of loosening of the torsion spring. If the opening time of the air door is too early, the torsion spring can be tightened. However, it must be noted that if the air door or shaft has stuck, it may cause the opening time to be too late. At this time, it should be opened for repair and troubleshooting. The adjusted air door subassembly can be directly mounted on the engine for actual use. The working time of the vacuum economizer should be adjusted to start at 110 mm Hg vacuum. If the effect is too early, fuel consumption will increase. At this time, the spring clip below the vacuum plunger can be moved down one slot to reduce the spring force. If the action time is too late, it will cause acceleration and poor transition. At this time, the spring clip can be moved up one slot to increase the spring force. The economizer valve push rod should be kept flexible and the push rod should be able to press 1.5 to 2 mm when the vacuum plunger is fully applied to ensure smooth flow of the ball valve. The piston of the vacuum economizer wears too much or the spring elasticity is insufficient and should be replaced with new ones. When inspecting the accelerating pump, check the integrity of the piston cup first, and do not loose loose, move up and down, wear, or lack of edge. If there is excessive wear, damage, etc., must be replaced, so as to avoid leakage of gasoline from the gap between the piston and the pump cylinder during acceleration, which will invalidate the acceleration pump. When reassembling the piston, the piston push rod can be repeatedly pressed and lifted to move the piston up and down, and the oil condition of the nozzle can be viewed from the acceleration nozzle. If the accelerating pump nozzle does not produce oil, further check whether the inlet and outlet valves are blocked or closed by dirt. If it is dirty, it can be cleaned with gasoline and then blown with compressed air. If it is not closed, it should be ground. The idling adjustment should be carried out when the temperature of the various parts of the engine is normal. First use the throttle opening adjustment screw to adjust the speed to the specified idle speed, and then use the idle adjustment screw to adjust the speed to a higher and more stable state, and then adjust the idle speed to the qualified range with the adjusting screw. At this time, you can also adjust the idle speed adjustment screw to adjust the rotation speed to the highest stable position. Adjust the throttle opening adjustment screw to the specified rotation speed. After 2 to 3 repeated adjustments, you can obtain the best idle adjustment. After the best adjustment, rotate the idle adjustment screw 45 to 90 inward. At this point, the engine speed is reduced by approximately 20 rpm, which results in lower idle fuel consumption and good idle emissions. In use, if there is a significant smoke emission from the exhaust pipe due to the accelerator closing, the idle adjustment screw can be reopened by about a quarter of a turn and the smoke release phenomenon can be reduced.
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