1. The combustible mixture is too rich. The remaining unburned parts will accumulate on the spark plug electrode and be charred, causing the spark plug to flash abnormally until it is damaged by carbonization. The reasons why the combustible mixture is too rich are generally that the oil level of the carburetor is too high, the main air volume hole of the carburetor is clogged, and the air filter element is seriously clogged. In addition, the choke valve of the carburetor is stuck and cannot be fully opened, or the enrichment valve is not working properly, which are also the reasons for the combustible mixture to be too rich.
2. Engine oil leakage. During the operation of the engine, if blue smoke or black smoke is emitted from the exhaust pipe, it indicates that excessive engine oil has entered the cylinder, which will cause the spark plug electrode to produce a large amount of carbon deposits, or be moistened by the engine oil and unable to spark off. This phenomenon is commonly known as engine channeling. Engine oil. For two-stroke engines, check whether the oil pump oil volume is too large and whether the rod sleeve seal and check valve have failed; for four-stroke engines, check the piston rings on the piston, especially the oil ring. Whether it is worn or not. Then remove the intake valve and check whether there are carbon deposits and wet grease on its head and back. If the valve and valve guide are severely worn, the valve guide oil seal is hardened or the oil seal lip is excessively worn, the fitting gap will be too large and the sealing effect will be lost. These two abnormal situations will eventually cause the oil in the valve rocker arm chamber to be sucked into the cylinder along the valve stem during the intake air summation, causing oil burning. In this regard, the valve guide, oil seal or valve should be replaced respectively depending on their wear and tear.
3. In the ignition system, the magneto is demagnetized, the wire connections inside the ignition coil and electronic ignition, the generator output end and the ignition coil input end are loose, and the ignition advance time is incorrect. If it is not timed properly, it will affect the ignition performance, and poor ignition performance will directly cause carbon deposits on the spark plug electrode.
4. Pay attention to whether the spark plug model and calorific value comply with the instructions for use. If the calorific value selected is one or two gears lower than that specified in the instruction manual, the temperature of the spark plug will rise very high and the heat cannot be dissipated in time, causing abnormal combustion and eventually causing the spark plug electrode to melt and cause premature damage. If the spark plug itself cracks during installation, it should be adjusted or replaced in time. 5. If the crankcase oil is filled too much, and if the breather pipe is blocked, the pressure in the crankcase will increase and the crankcase will not be balanced.
1. The combustible mixture is too rich. The remaining unburned parts will accumulate on the spark plug electrode and be charred, causing the spark plug to flash abnormally until it is damaged by carbonization. The reasons why the combustible mixture is too rich are generally that the oil level of the carburetor is too high, the main air volume hole of the carburetor is clogged, and the air filter element is seriously clogged. In addition, the choke valve of the carburetor is stuck and cannot be fully opened, or the enrichment valve is not working properly, which are also the reasons for the combustible mixture to be too rich.
2. Engine oil leakage. During the operation of the engine, if blue smoke or black smoke is emitted from the exhaust pipe, it indicates that excessive engine oil has entered the cylinder, which will cause the spark plug electrode to produce a large amount of carbon deposits, or be moistened by the engine oil and unable to spark off. This phenomenon is commonly known as engine channeling. Engine oil. For two-stroke engines, check the oil pump oil.Check whether the amount is too large, whether the rod sleeve seal and the check valve have failed; for four-stroke engines, check whether the piston rings on the piston, especially the oil rings, are worn. Then remove the intake valve and check whether there are carbon deposits and wet grease on its head and back. If the valve and valve guide are severely worn, the valve guide oil seal is hardened or the oil seal lip is excessively worn, the fitting gap will be too large and the sealing effect will be lost. These two abnormal situations will eventually cause the oil in the valve rocker arm chamber to be sucked into the cylinder along the valve stem during the intake air summation, causing oil burning. In this regard, the valve guide, oil seal or valve should be replaced respectively depending on their wear and tear.
3. In the ignition system, the magneto is demagnetized, the wire connections inside the ignition coil and electronic ignition, the generator output end and the ignition coil input end are loose, and the ignition advance time is incorrect. If it is not timed properly, it will affect the ignition performance, and poor ignition performance will directly cause carbon deposits on the spark plug electrode.
4. Pay attention to whether the spark plug model and calorific value comply with the instructions for use. If the calorific value selected is one or two gears lower than that specified in the instruction manual, the temperature of the spark plug will rise very high and the heat cannot be dissipated in time, causing abnormal combustion and eventually causing the spark plug electrode to melt and cause premature damage. When the spark plug itself is installed and used, there are some faults that are not easy to find and also affect the ignition performance. For example, if the spark plug is poorly sealed, the spark plug is not firmly fixed, the spark plug insulator is cracked, etc., it should be adjusted or replaced in time. 5. If the crankcase oil is filled too much, and if the breather pipe is blocked, the pressure in the crankcase will increase and the crankcase will not be balanced.