What kind of sound does a scooter engine make to be considered normal

However, when a person is in a state of uneasiness, anxiety or anger, the blood vessels in his nasal cavity also swell. Perhaps, this can explain why Chu Liuxiang, the hero in Gulong**, has a habitual action of stroking his nose. The gesture of touching the nose is usually a few quick rubbing of the hand against the lower edge of the nose, sometimes even a slight touch, which is almost imperceptible.

Women have less amplitude of movement than men when they make this gesture. Because, if a person's nose is itchy under normal circumstances, then he has to rub his nose more vigorously or even by picking his nostrils to get rid of the itching sensation, unlike the gesture of touching the nose that is just a light touch. Like the gesture of covering the mouth, the speaker touching his nose means that he is covering up his lies, and the listener makes this gesture indicating that he is skeptical of the speaker's words.

A simple itchy nose often triggers a single gesture of rubbing the nose repeatedly, and has no connection to the content, frequency, or rhythm of the entire conversation. Of course, judging the other person by touching his nose is undoubtedly lying, which is one-sided. The correct thing to do is to judge in conjunction with other body language, such as frowning, shutting up, etc.

10.Someone who likes to raise eyebrows is trying to show favor to someone who bends his eyebrows and glare, and it will make you look shocked. However, a raised eyebrow suggests that you are trying to show that you are interested in someone or something.

Britain's Prince Charles and former Prime Minister Tony Blair are both adept at using the gesture of raising eyebrows to express their friendliness towards others, because raising eyebrows is a hint to others: "I'm not a bad person; I'm interested in you; Take it easy, I won't dominate you. "Raising eyebrows is actually a way to get someone to take their guard off.

Raising eyebrows doesn't have to be obvious, a light eyebrow lift is one of them. Raising the eyebrows, a gesture to greet a person from a distance, has been widely used since ancient times. The meaning of this gesture is not only common all over the world, but even monkeys and orangutans greet each other with this gesture, so it can be seen that the action of raising the eyebrows lightly is.

The scooter starts or runs with a squeaky sound, do you know what's going on? The master teaches you that you can solve the problem with just a hair dryer at home.

Because of the air filter and dust exhaust system.

If the sealing performance of the air filter decreases, the noise of the scooter will increase. This is mainly due to the reduced resistance to air flow, so there will be more noticeable noise. The exhaust and wide air system of the carriage is relatively simple, but its airtightness and noise reduction ability are poor, and the noise of the scooter will also increase.

How to determine the occurrence of abnormal noise.

1. The disc brake emits an abnormal sound. When the motorcycle is over a pit or shaking, the brake pads make a clanging sound when hitting the iron, which must be a problem with the disc brake.

2. The rear brake makes an abnormal sound. This sound is often caused by water or dust entering the brake hub and does not affect the brakes. Also note that excessive wear of the asbestos layer on the brake pads can also cause this phenomenon, and if it has been a long time, it is recommended to replace the brake pads.

3. The engine noise is abnormal. The causes of the problem are complex. It is recommended to go to a professional repair shop for inspection and maintenance.

4. Percussion sound caused by deflagration. When the engine accelerates suddenly or the motorcycle goes uphill, there is a continuous sharp "click" sound inside the cylinder, which is a knocking sound caused by deflagration. Generally, the causes of this are overheating of the engine, excessive carbon deposition in the combustion chamber, low calorific value of the spark plug, use of low-octane gasoline, premature ignition, etc.

The common faults of scooters with a lot of noise are as follows:

1. The camshaft bearing is loose.

2. The working surface of the timing cam and the valve rocker arm is worn and heavy.

3. The rear clutch spring is broken.

4. The belt is not properly selected or the clutch accelerates behind, and the sound of the belt hitting the box appears.

5. The front clutch pulp bead is seriously worn.

6. The wear of the electric start clutch refers to good luck (the abnormal sound is more prominent when the electric start).

7. The ignition time is wrong, and the sound of the piston on the top of the valve (mostly seen in the vehicle after maintenance).

1. Air filter, if the tightness of the air filter decreases, the noise of the scooter will increase, which is mainly because the flow resistance of the air is reduced, so there will be more obvious noise He Wei. 2. Exhaust system, the exhaust system of the motorcycle is relatively simple, but its tightness and silencer ability deteriorate, and the noise of the scooter will also increase. 3. The clearance of parts, the valve clearance is too large, the timing chain is loose, the piston ring, and the excessive wear of the cylinder block will bow |The engine noise becomes louder.

The scooter engine is loud; Do you know that it is the fault of **? The master teaches you quick judgment and repair.

There are many reasons for the loud sound, such as the valve clearance is too large, the timing connection (the small chain in the engine) is too loose, the scooter is self-adjusting the chain, if the valve clearance is normal, it is good to change the chain, the lights are not on, according to your description, the rectifier charge is too large, resulting in the bulb burning out, the bulb in the general instrument is not very useless, unless the current is too large. It is recommended to go to the car repair shop and ask the master to help you measure the voltage! (More than 14 volts is high) if it is too high, it is OK to change the rectifier, otherwise it is useless for you to just change the bulb, and it will burn again.

1. Air filter, if the tightness of the air filter decreases, the noise of the scooter will increase, which is mainly because the flow resistance of the air is reduced, so there will be more obvious noise.

2. Exhaust system, the exhaust system of the motorcycle is relatively simple, but its sealing and sound reduction ability deteriorates, and the noise of the scooter will also increase.

3. The part clearance, the valve clearance is too large, the timing chain is loose, the piston ring, and the excessive wear of the cylinder block will cause the engine noise to become larger.

If the air intake is too large, the engine speed will be faster, and the recommended engine idle speed is 600 800 rpm.

A loud scooter engine can be caused by excessive valve clearance, worn valve rocker arms and camshafts, excessively long timing chains, damaged chain tensioners, pull cylinder pistons, loose oil pump chains, crankshaft bearings and camshaft wear, etc. Here's an introduction to the scooter: How the scooter drivetrain works:

The principle of the scooter transmission mechanism is that two split discs are connected by a transmission belt. When the engine speed is running at idle speed, the two split discs and the transmission belt are loose and cannot drive the motorcycle forward. When the engine speed increases, the two split discs are tightly connected with the belt under the action of centrifugal force, and the transmission ratio changes.

The higher the engine speed, the greater the change in gear ratio and the faster the vehicle speed. Maintenance of the scooter transmission system: After the motorcycle gearbox lid is covered, there will be directional air flow in the gearbox due to the air deflector on the front divider.

First, it dissipates the heat of the drivetrain. Second, it blows the dust generated during the operation of the transmission system out of the transmission box, avoiding excessive wear and tear on the parts inside.

Summary. The normal sound of the scooter engine should be deep and steady, with gradual acceleration as the throttle is adjusted. There should be constant noise when the engine is moving, but not too harsh or unusual.

If the scooter's engine is constantly making unusual noises, then it could be due to low oil or dropped parts. If you run the machine for a long time, you may notice some humming or fine-tuning sounds, but this is not a problem, just a natural sound cue of the engine running. In general, the normal sound of the scooter engine is a low, steady and gradual acceleration sound, if you experience a very harsh or unusual noise, or other odors or fault clues, please check the scooter's mechanical system to avoid damage.

That's all for me.

Can you tell us more about that?

The normal sound of the scooter engine should be deep and steady, with gradual acceleration as the throttle is adjusted. There should be constant noise when the engine is moving, but not too harsh or unusual. If the scooter's engine is constantly making unusual noises, then it could be due to low oil or dropped parts.

If you run the machine for a long time, you may notice some humming or micro-notation of bad tones, but this is not a problem, just a natural sound cue of the engine running. In general, the normal sound of the scooter engine is a low, steady and gradual acceleration of the sound of the leakage, if you experience a very harsh or unusual noise, or other odor or fault clues, please check the scooter's mechanical system to avoid damage. That's all for me.

1. The high noise generated by the high-noise exhaust pipe of the motorcycle can be solved by replacing the low-noise exhaust. Second, the high noise caused by serious wear and tear of the internal parts of the engine can be eliminated by replacing the internal accessories.

It is difficult for ordinary car owners to distinguish which ones are fault noises and which ones are reasonable noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. Models equipped with turbocharged engines distinguish between sound and natural suction; Models with engine guards may also make noises due to friction; After some car owners come into contact with different cars, it is likely that due to their lack of understanding of mechanical knowledge, they mistake reasonable abnormal noise as a vehicle failure.

Therefore, learn to distinguish the abnormal noise of the car and avoid wasting time and energy.

How to identify the sound of a car:

In practice, due to the limitations of working conditions, it is difficult to measure the sound of the car with special instruments, and the sound of the car can only be described and compared with the judgment of the sound in daily life. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal and abnormal sounds.

The vibration of each mechanism in the work of the car will emit a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal noise. The normal vibration sound of each system component (such as the noise on the surface of the engine), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal driving of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of other noises, so as not to affect the accuracy of judgment.

It is best to consciously amplify or reduce the sound, that is, use a screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize human interference.