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When the motorcycle is idling, the motorcycle is first moved and the throttle handle is turned to the minimum position. At this time, the engine can run at a stable minimum speed without outputting power, and can continue to operate for a certain period of time. When the flame is turned off, this speed is called idle speed, and the idle speed is adjusted to adjust the mixing ratio of air and gasoline at idle speed. Eliminate failures in ignition systems, carburetor, air filter and engine related mechanisms. The second step is to start adjusting the carburetor while the engine is hot and when the enrichment unit is stopped (the choke is reset or the enrichment valve is closed).
First, the concept of idle speed Idle speed refers to the speed of the engine when the power is not output. There are different values ​​due to the type and displacement of the vehicle. The so-called engine idle speed is the minimum speed of the engine in the neutral state when the throttle valve is nearly closed. Popular speaking: Idle speed is the working speed of the engine when the vehicle is waiting for parking.
Many friends who bought a new car. You can see when you buy a car. The merchant unpacks your car and then starts it. Use a small screwdriver to adjust a small screw on the carburetor. This is adjusting you. The speed of the car, after patiently running in, after a few months or even a year of riding, you will find that the idle speed and the initial time have a little change, which is to say that the idle speed is poor, the main engine of idle speed is the engine. There are three phenomena such as idle speed, excessive idle speed and unstable idle speed.
Second, the main performance of motorcycle engine idle speed
1. No idling When the engine is started, the throttle switch cannot be completely released, otherwise it will turn off. This phenomenon is called the engine has no idle speed.
The causes are: carburetor failure, or gas leakage between the carburetor to the cylinder, cylinder pressure is too low.
Treatment method: gradual inspection according to the principle of easy to easy, first simple and then complicated, from shallow to deep, first adjust the throttle adjustment screw and idle adjustment screw. If the idle speed is not adjusted, the carburetor is faulty and can be removed. Carburetor, use 0.2mm filament to pass through each hole, and use high pressure gun to blow off each channel and volume hole; if there is no idle speed, check if the intake manifold bolt is tight, if it is loose, it should be tightened; if not yet The idle speed indicates that the oil level of the carburetor float chamber is too low and should be adjusted. If the above method cannot be solved, check whether the cylinder pressure is suitable (greater than 600 kPa), and inspect each sealing part, such as valve, piston, etc., and remove it.
2. The engine idle speed is too high. The engine idle speed exceeds the specified range and cannot be lowered, or the engine will be turned off when the engine speed is turned off.
Cause: The throttle cannot be returned or the idle speed is too large.
Treatment: Check the throttle cable for flexibility or whether the throttle spring is too soft and replace it. Check if the idle hole is enlarged due to improper maintenance. If it is too large, it should be replaced.
3, engine idle speed instability When the engine is running at idle speed, the engine is shaking, the speed is high and low, this phenomenon is called idle speed instability.
The reason is: the ignition time is too early, the mixture is too rich or too thin, the spark plug gap is too small and so on.
Treatment method: Accelerate rapidly. If there is a knocking sound of “咔, å’”â€, it means that the ignition time is too early. The timing and valve clearance should be adjusted according to the mark on the flywheel of the magneto rotor. Slightly close the choke, if this time If the engine's rotation is worse, it means that the mixture is too lean and the idle speed is unstable. At this time, check whether the oil level of the oil and gas float chamber is too low, whether the idle oil passage is blocked, and remove it. If both of the above are normal, the gap of the spark plug electrode should be checked to the standard value. Motorcycle start three, how to measure the idling speed? Let me talk about the normal idle speed ejector 125-150 displacement 1500+-100r/m
Small chain machine 125-150 displacement 1500+-200r/m
Pedal 1600+-100r/m
Generally speaking, the idle speed standard of a 125 mL displacement motorcycle is around 1450 rpm, which is allowed to be 500 r/min according to the season positive and negative, but many motorcycle friends like to reduce the idle speed to 900 r/min. Indeed, lowering the idle speed can save fuel to a certain extent, and in the hot car state, the idle speed is almost unaffected by the vehicle. As everyone knows, this approach will bring a lot of harm.
Fourth, the harm of low idle speed is:
1. Because the idle speed is too low, the oil-air mixing ratio is not ideal, and the cold start is difficult. It is usually necessary to pull the damper to enrich the mixture, and the warm-up time is correspondingly longer;
2, it is easy to turn off when decelerating or parking, especially for novices;
3. If the idle speed is too low, the gear coordination of the engine is difficult when shifting, the smoothness cannot be guaranteed, and the impact between the gears is easy to occur, and the wear is large.
4. When the acceleration is insufficient, the performance of the motorcycle cannot be performed normally;
5. (Maximum damage) Some riders arbitrarily adjust the idle speed to the lowest point the engine can tolerate. However, doing so is actually extremely harmful!
Because the oil pump of a general motorcycle is directly driven by the crankshaft of the engine, this directly causes the oil pump speed to be too low, resulting in insufficient oil pressure, especially for the riding bicycle, between their camshaft and the bearing. A certain size of oil pressure is required to form a certain thickness of oil film to ensure lubrication. Then some cars that only ran for thousands of kilometers had abnormal sounds on the nose. When they opened, the camshaft was already scarred.
5. How to coordinate the relationship between idle speed, mixing ratio and spark plug?
The speed of the idle speed directly affects the performance of the vehicle and the fuel consumption of the car. The adjustment of the idle speed is mainly achieved by two screws, one is the idle screw and the other is the mixing ratio screw, but how to adjust this What about two screws?
The method of high-low and low-key idling circulating in the network is very practical, so you can use it to adjust. The so-called "one high" means that when adjusting the mixing ratio screw, it is necessary to try to increase the engine speed. The purpose is to make the oil and gas ratio of the idle oil supply system the best. For the scooter without the tachometer, It can only be heard by the ear, the rotation frequency is the fastest, the vibration is the highest, that is, the highest speed is; and the "one low" is to try to reduce the engine speed when adjusting the idle screw (the purpose is to make the idle speed of the throttle) See small to reduce the oil supply to the fuel supply system).
Warm up the engine for 10 minutes before adjusting, then:
1. Rotate the mixing ratio screw in the forward and reverse directions (we don't stick to the low and reverse 1.25 turns here) until the engine speed is the highest, stop rotating. If you are not sure, you can rotate it several times until you are satisfied. .
2. Rotate the idle screw counterclockwise to make the idle speed as low as possible.
3, repeat steps 1, 2, patiently adjust, so repeated 2, 3 times to get a satisfactory idle speed.
After the idling speed is adjusted, riding a long distance, under normal circumstances, the color of the spark plug center insulating porcelain should be brick red.
However, if it is black or white, then fine-tune it. If it is black, it means the mixture is thicker. The mixing ratio can be rotated counterclockwise. The rotation should be based on the degree of blackening of the spark plug. Generally 1/4 The circle is 90 degrees, then ride the end of the spark to see the color of the spark plug until the color of the spark plug is normal; if it is white, the mixture should be rotated clockwise than the screw, the same method as above. After the above adjustments, the relationship between your idle speed, mixing ratio and spark plug color can be said to be adjusted to the extreme.
Motorcycle idling, your partner needs to adjust it?
The average person does not care about the speed of the motorcycle. After all, it is idling. Unless it is often turned off, it will not care. In fact, idle speed is very important because idle speed is too high and idle speed is too low. The idle adjustment screw has a great influence on the performance of the engine. The idling adjustment screw of the carburetor has undergone rigorous testing and has been adjusted to the optimal position before leaving the factory. Therefore, it is generally prohibited to adjust the idle adjustment screw by itself. After a long period of use, Adjust if the idle adjustment screw position does change and causes undesirable consequences.