Solve common problems of small and medium-sized generators [Haixing Technology]

Solve small and medium-sizeddynamoFAQ
1. If not used for a long period of time (more than three months), please follow the steps below to store it.
A. Drain all the gasoline from the fuel tank and carburetor
B． Drain all the oil from the crankcase
C. Add new engine oil to the upper limit of the oil level on the oil dipstick
D. Close the choke and pull the starter handle until you feel resistance
E. Wipe the unit clean and cover it with a cardboard box or plastic cover to prevent dust
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2. Why does the engine automatically shut down when there is insufficient oil?
When the engine oil is insufficient, the oil warning switch inside the engine will ground the primary coil of the ignition coil, causing the ignition coil to fail to ignite and the engine to stall. How to check whether the oil level is standard: Place the engine in a horizontal position, unscrew the oil dipstick, clean and dry it, then insert it into the oil inlet (no need to rotate), then pull it out, and check that the oil level is above the middle of the dipstick.
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3. High altitude areasdynamoWhy is the output power reduced?
Answer: The atmosphere at high altitudes is thin, and the mixed fuel provided to the engine by the main nozzle of the carburetor cannot be fully burned due to the relatively scarce air. At this time, the engine speed may be unstable and black smoke may be emitted from the muffler. The engine must run smoothly by replacing the correct main nozzle. The output power of the engine decreases as the altitude increases, and the output power of the generator set also decreases. For every 1,000 meters of altitude increase, the power decreases by 10%. If the correct main nozzle is not replaced, the engine's power loss will be much greater than this standard, and the working condition will be unstable. The main nozzle of the standard model is only used at altitudes below 1,500 meters.
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4. Why is it necessary to close the damper when starting a cold engine and open the damper when starting a hot engine?
Answer: Because the throttle is closed when the engine is cold, the air entering the carburetor is reduced and the concentration of the mixture is increased, making it easier to start the engine. If the cold engine opens the damper at this time, the mixture will be easily adsorbed on the inlet wall, resulting in poor atomization and making it difficult to start.
Because when the engine is hot, you need to open the damper when starting, so that the ratio of the mixture entering the combustion chamber reaches the normal level, and it can be started easily. When the damper is closed, the air entering the carburetor is reduced and the concentration of the mixture is greatly increased, making it difficult to start.
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5. When the automatic voltage regulator (AVR) is damaged and needs to be replaced, what must be done?
Answer: The generator set does not generate electricity. A common fault is that the automatic voltage regulator is damaged. Therefore, when some people find that the generator set does not generate electricity, they often replace the old AVR with a new AVR to solve the problem. When users do this, they find that the new AVR loses its function after a few minutes of use, and then complains about the poor quality of the AVR. In fact, AVR damage is often caused by users overloading the generator set, causing the rotor to short-circuit, causing damage to the AVR. Therefore, before replacing the AVR, you must first check whether the resistance of the rotor is normal (for example, the resistance of the EC2500CX is 45-50 ohms). If the rotor's power pack is abnormal, replace the rotor first and then the AVR.
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6. How to check and clean spark plugs?
Answer: The inspection and treatment of spark plugs are divided into three steps:
Step 1: Check the carbon deposits on the spark plug. If there is carbon deposits, use a copper brush to clean them.
Step 2: Check the spark plug gap. The standard gap is 0.7-0.8MM, which is about three business cards thick. If the gap is wrong, it can be adjusted.