How do you know the sparks are weak and cannot cause a fire? I sell generators. As long as you can see an obvious arc when lighting, you can light it. If it is so dim that there are only small bright spots, consider the ignition coil problem. Solution: Check the gap between the ignition coil and the flywheel. It is best to check the gap between 20 and 30 threads, or the thickness of a business card. At the moment it is not possible to change the coil. If the arc is clearly visible, please determine if the valve is loose and changes the clearance.
After starting the engine, gradually increase the throttle. If you hear a rhythmic "pop, pop" sound from the exhaust muffler throughout the speed process, from low speed to high speed, it will follow the rhythm. increase in engine speed and the frequency of “pop, pop” sounds also increases, we can determineer that some engine cylinders are not working.
When it is determined that a few cylinders are not working, the spark plug should be replaced first, and then check whether the high pressure part has fallen off. If it does not fall, use the high voltage short circuit test method to determine which cylinder is not working, that is, use a screwdriver to short the spark plug and pay attention to the engine speed changes. If the engine speed drops significantly after a cylinder's spark plug shorts, it means the cylinder is operating normally; if the rpm decreases slightly, the cylinder is not working properly if there is no change in the rpm; this means that the cylinder is not working.
To check the ignition system, it is best to use an ignition oscilloscope. In the absence of an oscilloscope, the following methods may be usefulized to check:
Maintenance methods:
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1. For example, if the cylinder does not work, you should disconnect the high voltage bypass line from the cylinder and check for fire at a distance of about 5-7mm from the spark plug. no fire, you can remove the other end of the branch line from the distributor jack a little and check the jack if there is a bypass to the branch line. If there is a bypass, it is a leak in a junction.
2. If two cylinders are not working, you need to disconnect the cylinder line to two cylinders, about 5-7mm from the spark plug, and check for bypass. If both sparks occur but the engine speed does not change, the wires for both cylinders may be loose or the spark plugs for both cylinders may not be firing. If both cylinders do not spark whenare removed, or if one sparks and the other does not, check according to the inspection method that one cylinder is not working. If the plugs next to the distributor caps of the two non-working cylinders are adjacent, first disconnect the cent from one cylinder and check the spark plug about 5mm from the spark plug. If there is no fire or the fire is weak, reinstall the bypass line, disconnect the bypass line from the other cylinder and check the spark situation. If there is also no fire or the fire is weak, connect the two jump wires. the cylinder block for bypassing at the same time, and always keep the distance between the two secondary lines of the cylinder block, one line far away and one near. If which branch line is closer and which one is sparking, it could definitely be due to a current leak. the jack where the two cylinder bypasses are located.
3. If the high voltage secondary line flashes to the spark plug and the spark is strong and the spark plug is good, you should check whether this is caused by a mechanical failure of the engine.
4. For electronic ignition engines, an oscilloscope must be used and the above method cannot be used to test fire. Additionally, if the carbon deposit on the spark plug is significant, this may be due to excessive engine wear. The mechanical defect must be eliminated before further inspection.