hope
Hope is to observe the appearance of the motorcycle. Many cars look new, but they are refurbished. The most typical is the carburetor of the old model, at least until now I have not seen the refurbished carburetor. There is also a large plastic piece on the reverse side, which is cast with the production year of the product. If you look at more than 2 pieces, you can basically determine the year of the car. This is because no car seller will replace all the plastic parts to make a fake, otherwise the car will definitely lose money. Once the production year has been determined, there will be an approximate number of kilometers traveled by the car, rather than the number of kilometers on the odometer. In addition, the exhaust pipe of the motorcycle can also explain certain problems. The ordinary exhaust pipe will have different degrees of discoloration after using for a period of time, and the discoloration is more serious, which is the result of frequent large throttle or long-term high speed. Exhaust is not included here.
After determining the age and number of kilometers, look at whether the vehicle has collided, whether there is any damage to the engine casing, whether the frame beam is damaged or deformed, speedometer, tachometer, odometer, interval Whether the instrument such as odometer and water temperature meter works normally, the wear of tires, chains, sprockets, brake pads, brake discs, etc. Observe more when purchasing, the benefits of future use are self-evident.
smell
The so-called smell, including smelling and listening to sound. When the normal engine is working, the sound of the exhausting sound is smooth and crisp, and there is no "beep" or other noise. It runs smoothly at idle speed, and the engine speed of the throttle should rise slightly. Experienced friends can sense the correct cylinder from the exhaust sound of the engine. If you can't judge it accurately, you can also check the spark plug after running for a while. A normal spark plug should be dry and light brownish yellow. If the spark plug is wet and has a strong gasoline smell, the cylinder is not ignited. At the same time, it is also possible to know from the color whether the proportion of the fuel mixture is appropriate, and further understand the working condition of the carburetor.
When the concentration of the mixture is too large, the carburetor model contains a relatively obvious gasoline smell in the exhaust gas discharged from the exhaust pipe, which may be due to a misalignment of the carburetor or a serious blockage of the air filter. You can also smell the smell of the engine oil. If it contains a strong smell of gasoline, it may be caused by excessive wear of the piston ring or irregular wear of the cylinder, resulting in poor sealing, which causes the fuel mixture to enter the crankcase. Under normal circumstances, imported second-hand motorcycles have a high fuel consumption, but the degree is different. The main reason is that the main hole of the carburetor wears up, the oil level of the float chamber is too high, or the working state of the carburetor is incorrectly adjusted. Then there is to listen to the sound of the bearing rotation of each part, and whether the rotation is smooth.
Inspection
The so-called inspection is observation and inspection. A good suspension system should be stable and stable, and the rebound can be quickly and forcefully effective. It can effectively alleviate the impact force. There should be no abnormal noise, stuck and incomplete return. The suspension oil seal should be completely leak-free. The front and rear suspensions of large-displacement motorcycles generally use coil spring oil pressure damping, and even high-grade oil and gas damping and multi-stage pre-adjustment can provide a variety of road suspension requirements.
Electronic igniters and rectifier regulators are important components to ensure proper ignition and power supply to the motorcycle. Large-displacement motorcycles generally use non-contact electronic ignition, and high-end even micro-computer control to get the correct ignition time in both high-speed and low-speed segments. The detection of electronic igniter and ignition time under amateur conditions is very difficult. Under normal circumstances, if there is no cylinder missing, no knocking, and strong acceleration, the performance is basically considered to be good.
The damage of the rectifier regulator is concealed. Under normal circumstances, it is difficult to find if it is not for a long time. If you drive for a long time without your knowledge, the battery will be completely damaged by over-charging for a long time, which will damage the electronic igniter. In the imported second-hand motorcycles, the damage of the rectifier regulator is more common. This may be due to the development of foreign highways, and the long-term high-speed driving causes damage to the rectifier regulator. For the detection of the rectifier regulator, you can measure its output elegance with a multimeter. Under normal circumstances, the output voltage of the rectifier regulator is always stable between 13-14 volts, and does not increase with the increase of engine speed.
test
The test is to test. Although the previous inspection results are very good, the motorcycle is finally used for driving, but it is necessary to test it with practice. Press the start button, pay attention to whether the rotation of the starter motor is strong, whether there is noise or not, and whether the start is smooth. Run at idle speed, preheat the engine, and observe whether the speed is stable and there is no noise.
Then add the throttle and listen to the abnormal sound when the engine speed rises. Hang up the gear, slightly increase the throttle, release the clutch grip to start, pay attention to comprehensively test the vehicle's handling performance, acceleration performance, stability and comfort. Pay attention to whether the shifting is simple, whether there is any dislocation, and the shifting is not in place. Whether the speed change when the throttle is increased is stable, and there is no rush. Whether the clutch is slippery or not completely separated, and there is abnormal noise at each bearing.
For example, the quasi-vehicle owner with higher riding skills can try the 30 km/h test on the unmanned road section. This can verify that the frame is not correct. If the vehicle can still keep straight in the road after the sprinkling, the basic frame can be explained. The problem, on the other hand, indicates that the car should have suffered a certain degree of accident, because the plastic repair of the frame is impossible for ordinary repair shops.
Based on the current large-displacement motorcycles, the number of motorcycles has increased significantly compared with the previous years, but a considerable number of them have a small number of models. It is recommended to purchase more popular models based on the style. Models such as road sports cars include Honda's CBR series, Yamaha's YZF series, Suzuki's GSX series, and Kawasaki ZX series, which have many conveniences for future maintenance.
The newly purchased used car needs to be thoroughly maintained before use, so that the motorcycle can check and replace the brake oil of the oil, cooling water and hydraulic brake before use, and add liquid to the upper and lower scales; check the air filter , the use of oil filters, batteries and spark plugs, loose and rusting of fasteners, maintenance or replacement according to the situation; adjustment of tire pressure, chain tension and so on.
English referred to as ICD, full name Industrial Communication Device. This section will introduce the wired communication equipment and wireless communication equipment applicable to industrial control environment in a comprehensive way. Wired communications equipment to address the industrial field of serial communication, professional bus-based communications, industrial Ethernet communications and various communication protocols between the conversion equipment. Wireless communication equipment is mainly wireless AP, wireless bridge, wireless card, wireless lightning arrester, antenna and other equipment.
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