Why does the moped consume so much fuel? How to solve it?

One-stroke and four-stroke piston internal combustion engine is a kind of engine with complex structure, and scooter with variable speed drive is a kind of transportation with complex structure and many problems.

Second, the high fuel consumption of scooters is mainly caused by six factors.

1, belt stepless speed change is convenient to use, but belt transmission consumes a lot of energy; Even in the hot car state, there is generally 20% transmission consumption, almost 30% less road code. If the car is cold, the belt damping is greater, consuming almost 40% of the engine output power. There is also the "entrainment damping" after the pulley is worn, which usually makes the engine consume nearly half of the energy on the belt drive system; In other words, almost 30% of scooter fuel is consumed in the belt drive system, otherwise the same amount of fuel can run 40% more.

2. At present, domestic scooters adopt a belt stepless speed change system without exception, which is convenient for citizens of battery car level to drive and control; The belt stepless speed change is to change the transmission ratio according to the engine speed, instead of manually selecting the transmission ratio according to the driving speed and load like a shift car, which can not achieve the economic transmission conditions of high/low speed. This "shift" mode makes it difficult for the engine to play the best fuel efficiency, so the fuel consumption rate of the scooter has been high. Usually, the same amount of fuel can only reach 65% of the distance in the underbone.

3. Theoretically, although the isobaric vacuum membrane carburetor can prevent the low throat negative pressure = lack of oil caused by the sudden tightening of the throttle by newcomers, this carburetor itself is a relatively complicated imitation vehicle that consumes oil and is prone to failure. In the oil circuit structure of this carburetor, usually only the idle throttle and idle oil concentration are adjustable, and the main oil needle is generally not adjustable; That is to say, the main oil system is preset in a very oil-rich state, which is enough to adapt to the environmental temperatures in the north and south and Xia Dong in four seasons. How can such a design not be rich in oil? How can you call a scooter if you don't consume oil?

4. Although the scooter's shell is streamlined, the tires used by most domestic scooters are thick and short, and the wheels of some cars are almost like pumpkins; Compared with the tire of 2.5- 17 underbone, the off-road ability is much worse and the driving resistance is greater. Some years ago, I saw an overseas scooter with a 2.5- 17 big wheel. It is more comfortable to sit with a bigger frame, but I don't know why there is no imitation in China so far.

5. In the process of developing pedal electric fuel vehicle in ZJ this year, it was found that the camshaft of four-stroke engine was a loose accessory, and many engines had some strange problems after assembly and before factory debugging. Finally, it was found that most of the problems were related to this camshaft. There are two cams on the camshaft that are responsible for intake and exhaust respectively, which determine the opening and closing timing of the intake valve and exhaust valve. As long as there is a little mistake, the performance of the engine will go wrong. The four-stroke engine is quite sensitive to this, but many outsiders know nothing about it.

6. In the days of ZJ, a lot of research work has been done on the igniter of scooter, and it is finally found that the Japanese-like car popular in the market at present is an igniter with very simple ignition angle change curve and unreasonable ignition angle; Its ignition effect is almost the same as that of XH90 integrated igniter. Or, it is similar to the segmented double collision fire developed in the early years of this edition. In the summer of 2008, relying on the equipment of JL Group, after three months of tossing and turning, the domestic igniter was finally made, and the angle-changing curve was more reasonable, which could greatly improve the performance of scooter. Details, there are n special posts in the edition.

Third, the fuel-saving potential and effect of traditional scooters:

At present, the fuel consumption rate of general pedal wiping (including fuel-assisted vehicles) is mostly around 2L/ 100KM under normal and good conditions. Exceeding this data indicates that the pulley is worn or the carburetor is improperly adjusted. When the fuel consumption of the vehicle rises above 3L/ 100KM, it is usually that the pulley is seriously worn and begins to be entrained, or the electric heating enrichment on the carburetor is not turned off. According to some pedal light friction in normal and good conditions in this edition, the improved light friction not only improves the acceleration power, but also reduces the engine emission value. Its fuel consumption is mostly lower than 2L/ 100KM, and even reaches 1.7L/ 100KM in summer, which is equivalent to about 60KM per liter of fuel.

A scooter with transmission can't compare with an underbone with gear shifting. Generally, the downward bend can reach 1.4L/ 100KM, and the small curved beam modified by this version of technology can generally reach120 ~150 km/L. But at present, due to the internal friction of belt drive, the fuel consumption per 100 km is almost not lower than 1.6L, which is the original. But for various reasons, it seems that this plan will have to be postponed. )

4. Simple fuel-saving measures and principles of conventional scooters:

As far as the backward design of conventional scooters is concerned, there are roughly the following ten points that can simply save fuel:

1. Improve the electrothermal enrichment on the existing carburetor: change its circuit to one with indicator light for easy monitoring. Or change to manual control; If it really doesn't work, completely close the concentration oil circuit to reduce the oil consumption failure of concentration.

2. Improve the carburetor: strengthen the atomization effect of the fuel foam hole, change the main oil needle of the carburetor to be adjustable with the season, expand the air distribution hole of the idle oil circuit, and change the negative pressure enrichment structure to negative pressure oil reduction.

3. The nozzle is improved into a shape with the effect of rotating oil, and then a new storage container produced in 2008 is used to fully vaporize and mix the oil mist before it enters the cylinder, thus improving the starting performance and fuel saving rate of the engine.

4. If the carburetor can't be replaced, replace it with a plunger carburetor; It is convenient to adjust the oil vapor concentration, reduce the sub-pathological failure, and change the waste state that the old carburetor is always seriously rich in oil.

5. Shorten the front pulley axle sleeve car by 1mm, so that the speed reduction of belt drive is higher than the starting point. Reducing the engine speed can save a lot of oil without affecting the starting performance.

6. In winter, the hot air hood is added to the air inlet of the air filter, so that the engine can suck in the hot air discharged by the engine, and the vehicle can also have economic fuel consumption close to that in warm spring in cold winter.

7, further improve the ignition system circuit, enhance the ignition power and variable angle performance; Drivers who have the conditions and hands-on ability can modify the TB80 domestic igniter newly developed in 2008 to improve the locomotive performance.

8. For licensed riders who don't seek rapid acceleration, heavier Pritzker beads can be used to reduce the speed change of the engine, which has a certain degree of fuel saving effect.

9. Carefully check the camshaft in the cylinder head. It is best to remove the camshaft and polish it again. About this part, there is a special post in the edition, which can save fuel 10~20%, which is more remarkable than installing WX/WH system.

10, the tire diameter is larger, and the inflation is sufficient to reduce the rolling resistance. If possible, replace the engine with variable speed/chain drive engine.

There are already special posts about the above ten aspects in the edition, and the details are about hundreds of thousands of words, which is inconvenient to pile up in this post. Please consult them yourself if necessary. 〕

Verb (abbreviation of verb) Preparation before vehicle fuel saving improvement: Check whether the vehicle is basically in good condition. (This is only the joint oil part. )

When a scooter needs to improve its fuel-saving performance to meet the basic requirements of environmental protection, it should first check whether all parts of the motorcycle are still in normal condition.

1. Is the tire full of gas? If the tire pressure is insufficient, the fuel consumption will increase by 10-20%, which is only about 80% of the original road specification.

2. What is the compression performance of the cylinder? If the cylinder is worn and leaks air, the working efficiency will be reduced, and it will be more difficult to save fuel and start. Replacing the piston ring can solve the problem.

3. What is the clearance of the valve? The camshaft is a moving part, and wear is inevitable; Check once every six months, leaving enough stem clearance to ensure that the valve closes tightly.

4. Spark plug condition: Carbon deposit is a sign of serious engine oil enrichment, so the carburetor should be adjusted in time. If the electrode gap is large and it is difficult to start, it should be repaired in time.

5. Condition of pulley: After using 5000 kilometers, pay attention to the wear and tear of front and rear belt pulley sleeves; Check it if you have it. Driving with a belt between your legs is difficult and expensive.

6. Air filter element condition: check it every thousand kilometers according to the road conditions and clean it by the way; If the filter element is blocked by water foam and dust, there will be a lot of oil in the carburetor.

7. The state of carburetor: Check and adjust it every three months according to the vehicle condition, spray some carburetor cleaning agent, and clean the air distribution hole to avoid excessive oil.

8. Electrothermal thickening state: When starting a cold start for the first time every day, the car must be warmed up for three minutes, and the normal electrothermal state can only be turned off by itself if it feels thickened.

9. Check whether the electric enrichment is closed tightly: if the carburetor idle oil screw is screwed clockwise to the end, if the idle speed is not closed, the electric enrichment is not closed tightly.

10. Check the circuit of each system. If there is power loss such as leakage fault, many a mickle makes a mickle over time, which will not only lead to flameout, but also be a fuel consumption factor.

Sixth, the fuel-saving project carburetor modification: (here, the fuel-saving content is the main content. )

The quality of carburetor has great influence on the performance of motorcycles, especially scooters. Carburetor failures account for more than half of the total vehicle failures.

When it comes to carburetor of scooters, some people talk about brands. We don't talk about those illusory things here, but only about how to modify it to save fuel.

1. Enlarge the gas distribution hole and main oil foam hole: This carburetor is not practical in design, and its gas distribution hole diameter is usually about 0.5 mm ~ 0.9 mm, which is often blocked by dust, resulting in more and more oil output from the carburetor. After many practical experiments, it is found that the atomization effect of gasoline is better after increasing the air distribution hole between idle speed and main oil, which not only saves fuel and increases power, but also reduces the disadvantage that the air distribution hole is often blocked by dust and grease, and is easy to clean with flushing agent.

According to the test results on the carburetor of several pedal mopeds, the air distribution hole at one end of the carburetor can generally be expanded to about 1.0 mm ~ 1.5 mm, which not only reduces the oil output, but also has abundant air distribution to participate in gasoline atomization, and the power of the engine tends to increase. The main oil needle of this carburetor is usually not adjustable. If there is still too much main oil after trial operation, several small foam holes can be drilled on the main oil foam pipe to increase gas distribution and reduce the main oil output.

2. Modify the main oil needle: The design of this carburetor is very unreasonable. The main oil needle of most carburetors is actually not adjustable. Different from the main oil needle on the carburetor of the shift car, there are five ring grooves in the head, which can be stuck with a small snap ring to change the installation height. The simple way is to increase the foam holes of the main oil foam pipe, which can reduce the main oil output; In winter, the main oil needle is improved, and a small gasket is added to increase the oil output. The standard practice is to carve five ring grooves on the main oil needle, find a small snap ring and clamp the main oil needle like a plunger carburetor. You can also weld one more section on the original main oil needle, tap the thread of M3, and tighten the small nut of M3 after adjustment.

3. Modify the negative pressure spring: There is a spring in the diaphragm bowl of the main oil plunger of the isobaric vacuum diaphragm carburetor, and its elastic hardness varies from carburetor to carburetor, so there seems to be no uniform standard. According to the principle that it is driven by negative pressure, changing its elastic hardness will play a certain role in the supply performance of main oil. According to the related negative pressure principle, if the spring is changed into a soft point, it can be aerated and reduced in oil, which is convenient for acceleration; If the spring hardens, the negative pressure in the throat will be higher, the main oil and inert oil will be thicker, and the locomotive speed may be slower. Individuals are not encouraged to change this item here. Most people don't have so many spring spare parts at hand, so it is difficult to recover the carburetor if something goes wrong.

4. Change electrothermal thickening: electrothermal thickening is more convenient for scooter riders; But if it is broken, it will be hidden, which will cause some disadvantages such as unstable car condition and high fuel consumption. It is suggested to connect a small bulb in series in the circuit to heat it to monitor its live working state. If the accelerator pump on the carburetor works, it can be used for extra fuel when the cold car starts. The big spring of the electric heating thickening part can be installed in reverse immediately, so that the small plunger oil needle can press the thickening oil path forever, which is equivalent to canceling the oil consumption part and solving the trouble in this part.

5. Cancel negative pressure concentration: On the side of this carburetor, there is a negative pressure chamber, which can concentrate idle engine oil. Its structural principle is to close the large distribution hole of idle oil when the negative pressure increases, so as to enrich oil and steam. Its principle is said to be to prevent the exhaust pipe from jumping when the vehicle slides down with the throttle closed. This device will bring fuel consumption factors to the vehicle, and it is also easy to fail because a tiny metering hole in its structure is blocked, resulting in unstable carburetor performance. If the idle air distribution hole at the inlet of carburetor is enlarged, its function can be eliminated. If you have some manual skills, you can also change it to a structure that thickens the oil vapor when the negative pressure decreases. This is a more advanced and reasonable fuel-saving measure.

6. There are two kinds of plungers in this carburetor, among which the design of the bell-shaped plastic plunger is poor, and its base needs to be reformed to reduce its impact point and improve the starting response performance of the carburetor, thus saving fuel. The specific method is to cut off the convex edge of the lower seat at the upper part of the plunger, which can usually lower the plunger by 2mm and improve the starting performance of the carburetor. (After changing the plunger, the main oil needle should be adjusted accordingly ~ ~ ~ ~)

7. For car enthusiasts with good handwork, you can try to polish and make the main oil needle yourself, so that the scooter can achieve the best fuel-saving state. The main oil needle can use copper-clad electrode, and the processing and polishing equipment can use ordinary bench drill. Usually, the copper-clad covered electrode is first roughly filed with a file, then clamped on a bench drill and polished with a speed gear and coarse sandpaper. Before grinding, measure the old oil needle, design a new oil needle, and then measure while grinding, and the new main oil needle is gradually ground in place. Finally, whether to process the five grooves on the main oil needle or scrape out the ring groove with a scraper made of bench drill and small saw blade.

8. About the new oiler: At present, the plunger carburetor for scooter has been listed, which is a replica of TH90 and GC 125 plunger carburetor, and the price is about 120 RMB. The advantages of plunger carburetor are simple structure, convenient adjustment, stable operation and low price. When used on scooters, the idle fuel consumption can be adjusted to 60% of that of vacuum film carburetor. But the fatal disadvantage is that the throttle can't be screwed quickly, otherwise it will lose negative pressure = lean oil flameout; People who are used to it don't care, just feel that they are still riding bicycles; It is usually difficult for people who are used to riding scooters to adapt to this characteristic of plunger carburetor at one time.

According to the reaction of merchants, it is said that those plunger carburetors are difficult to start in the north, so when we develop new domestic scooter carburetors, we pay special attention to the problem of cold start-up and test out a new secondary atomization structure. At present, the first generation plunger carburetor based on TH90 has passed the stage of cold start and daily use at minus 15 degrees. But the size of that plastic float is too small, and it must be a hidden danger in the future. I don't want to do it anymore. The second generation is currently being studied. Compared with the old carburetor, N improvements have been made to reduce the production cost and the risk is considerable. Now I dare not say anything. The design of the third generation is ideal, and the structure is close to the state of EFI in theory; But at present, I can't promise my friends. In case the boss refuses to put into production because of the high cost, I can't help it. If we can complete the carburetor stall in the Year of the Ox this year, the scooter business will be basically completed; Unless the engine is replaced by gears or the carburetor is replaced by EFI, there is usually no greater improvement on scooters. )

7. Throat refueling system of fuel-saving project: (Special fuel-saving and environmental protection content. )

Throat refueling system is unheard of for four-stroke scooter, and it is one of the most important research results of this light skyscraper in fuel saving of scooter. Its fuel-saving principle is very simple: it is to use the oil and gas huffed and puffed by the storage container to form a strong vortex airflow at the throat, strengthen the scouring and stirring effect of air on oil mist, accelerate the volatilization of gasoline at the throat, and prevent gasoline from entering the cylinder in the state of mist droplets. The function of increasing the total volume of the throat of the storage container is to increase the stay time of atomized gasoline droplets in the throat outside the cylinder by several times, and then enter the cylinder after being washed and vaporized by cyclone vortex, which makes the spark plug easy to ignite and the oil-gas combustion effect better. The fuel saving effect is remarkable, the engine runs more smoothly, the cold start performance is greatly improved, and the cylinder wall lubrication layer is easy to maintain; In the fuel-saving state, the power of the engine is increased, but the pollution can be reduced.

Although there are many other schemes for throat refueling system, it is not easy to implement a better fuel-saving scheme than oil storage container+vortex throat for scooters with short throat. Moreover, some fuel-saving schemes studied in the past have affected the power of the engine to some extent. Only such a combination is an excellent scheme that can save fuel and improve power, so it is disclosed to everyone here. At present, this refueling system consists of two parts, one is the steam inlet with vortex nozzle, and the other is the storage container of vortex throat. For the current scooter, the vortex throat is to add a vortex nozzle to the lower left of the original motorcycle throat, and the vortex storage container is a closed cylindrical vacuum tank. The combination of the two can improve the quality of oil and gas before entering the cylinder.

In this light skyscraper edition, there have been many posts about the details of this refueling system. In the past three years, thousands of riders have used it. Its effect depends on the vehicle condition and everyone's adjustment level of carburetor, and generally it will have a fuel-saving effect of more than 10% and a starting performance of-0/5 degrees. If you try it yourself, pay attention to the position and angle of the steam nozzle on the throat and storage container. Sometimes a slight difference will lead to a great difference in oil melting effect. Generally speaking, the pore size of steam is related to the volume of the storage container. If the volume of the storage container is larger or the aperture of the gas nozzle is smaller, the effect of steam blowing will be stronger, but the throttling reaction will be slower. If the storage container volume is small or the nozzle aperture is too large, the effect of blowing and reducing the engine speed will be smaller, so you can choose the key points according to your own car conditions and needs.

8. Heating and air intake system of fuel-saving project: (special fuel-saving and environmental protection content)

According to some fuel-saving experiments ten years ago, heating intake air is very effective for engine fuel saving; Especially when the ambient temperature drops in winter, a hot air hood is added in front of the air inlet of the air filter, so that the engine can suck in the hot air flowing out after the air cylinder dissipates heat, and the vehicle can also have economic fuel consumption similar to that in warm spring in cold winter. This practice has been done on two-stroke locomotives in the past, and the fuel saving effect in winter is above 20%; Recently, in the fuel-saving experiment of four-stroke scooter, the fuel-saving effect of this method is also obvious. At present, there is no consideration in the design of pedal light motorcycles in China, and the space in the engine compartment is very small, so it is a bit difficult to relocate the intake hot gas tank.

If you want to do this easily on the pedal, you can easily get a lot of hot air discharged from the engine after heat dissipation by inserting a hole in the engine hood. However, it should be noted that the hot air discharged by engine heat dissipation has a little wind pressure, which inhibits the main oil of carburetor, and the direct entry will lead to the engine speed not going up. Someone has done this experiment, thinking that it can boost the voltage and increase the power. The result is contrary to the carburetor theory, which breaks the naive fantasy that many people think that simply increasing the intake pressure in front of carburetor and air cleaner can improve the engine power. (Some people even applied for a patent for this untested fantasy, but it was actually believed-)

According to the proposal in this edition, the specific method is to add a large plastic tank in front of the air filter inlet, and the outlet of hot air is also in the tank, but it is not directly opposite the air filter inlet. The advantage of this move is that the function of the large fuel tank is to cover the hot gas discharged from the engine in the fuel tank, so as not to let it flow away and let the intake pipe inhale freely. Engine cooling gas containing gasoline smell is inhaled and burned by the engine, which is very environmentally conscious. And the breather pipe in the engine crankcase. It is said that its pollution discharge accounts for 20% of the total pollution discharge of four-stroke engines. The nozzle should also be inserted into the big tank at the air inlet to burn the oil smell again.

From the theory and technology of light engine, it will be of great fuel saving and environmental protection to reuse the heat energy and oil smell of the engine. But the contrast of engine's "heat engine effect" will be even greater. For the conventional carburetor which can't control the oil-gas concentration randomly, the lean oil performance when the engine is cold and the rich oil effect after the engine is hot will be more obvious. This will make the intake temperature of the engine ten different in winter and summer. In the traditional plunger carburetor, it is equivalent to the effect of changing the main oil needle into two or three grids, which is not suitable for the general carburetor. Therefore, although this move is fuel-efficient and environmentally friendly, it puts forward higher requirements for carburetor, which needs to have the function of automatic control or manual control of oil and gas concentration, and can adapt to the great change of intake temperature.

This phenomenon that the inlet air temperature difference affects the oil and gas concentration was shown in the fuel saving test ten years ago. For this reason, several manually controllable air intake choke valves were developed on the old YH light motorcycle to make up for the problem of poor oil-gas concentration before starting the cold machine. Although manual wind protection has achieved some gratifying results in oil control, it is not realistic to use manual oil-gas concentration control mode and bimetallic hot gas control plate for scooter riders who only use belt automatic speed change and automatic oil-gas concentration control at present. Therefore, in order to improve the utilization rate of this kind of engine waste heat energy, we should expect to develop a perfect motorcycle fuel control system in the future, which can accurately supply appropriate fuel to the engine according to the engine temperature, intake temperature and the flow rate of each intake.

9. Fuel-saving engineering belt transmission system: (Here, fuel-saving content is the main content. )

There are many posts about the detailed principle of belt stepless speed change in this light skyscraper, so I won't go into details here. According to the principle of belt stepless speed change and the structure of scooter, there is a great contradiction between fuel saving and acceleration performance of scooter. Unlike the gear selection of shifting car, the power and efficiency of engine can be played by manual selection. Even so, there are still some measures to give full play to the advantages of fuel saving when the engine displacement and power are sufficient.

1. Increase the starting diameter of the front belt: the specific method is to shorten the front belt shaft sleeve by 1mm, so that the two belt surfaces are close to each other. First, the belt can be clamped to avoid increasing friction when starting and reduce the probability of belt wear. Second, the starting point of the working diameter of the front plate can be made larger. After changing this transmission ratio, the engine speed will be reduced at various speeds, which is beneficial to the efficiency of the engine, and also has the functions of protecting the engine and saving fuel. The side effect of this method is that the idle fuel consumption is slightly higher, and the acceleration performance and climbing performance of the vehicle are slightly lower, which is more suitable for use in plain areas.

2. Change it to weighted Pritzker: Its fuel-saving principle is similar to 1 above. , but the difference is that 1 mentioned above. It works in all engine speed segments, while the weighted Pritzker only changes the "shift" speed of the front plate; That is, when the engine speed is not high enough, let the front plate increase the transmission diameter of the belt in advance. Usually, this method does not affect the starting performance of the vehicle, but only affects the acceleration performance of the vehicle; Pritzker beads are too heavy, which aggravates the wear of the front plate and makes the vehicle unable to accelerate. If you replace it with a larger diameter of Pulizhu, it will have the effect of 1 mentioned above. However, due to the reduction of the sliding range, the change multiple of the total transmission ratio will decrease.

3. Changing the compression spring of the rear disc: changing its function is similar to Pritzker's principle of changing weight, and appropriately reducing the pressure of the rear disc spring will save fuel; However, excessive decompression will lead to belt slippage = heat and wear and weak vehicle acceleration. According to the application experience of JH belt car for several years, if the pulley quality is average and the owner does not need special treatment, this spring will anneal itself and soften slowly during use, thus reducing the pressure on the rear disc. In the process of replacing this platen spring, special attention should be paid to: the length of the steel wire of the spring cannot be shortened casually. Short springs with too strong elasticity after compression will not have enough pressure to clamp the belt at first, and the belt will easily slip, but at high speed, the engine will rotate too fast and overload.

4. Pay attention to lubricating the sliding sleeve in the pulley: this is not in the fuel-saving project, but it is very important to the fuel consumption rate of the scooter, so I want to emphasize it by the way. Because the belt roller sleeve of the scooter will gradually wear out, the disk surface will swing, resulting in an "entrainment" phenomenon that ordinary people don't know, increasing the internal resistance of the scooter's transmission, increasing the burden on the engine, and making the vehicle show a morbid state of insufficient power and soaring fuel consumption. This sub-morbid pulley can't be seen in appearance and idling. It will only be shown in operation, and ordinary newcomers can't check it out at all. It is very big. Adding extra viscous lubricating oil to the shaft sleeve of pulley can delay the wear of shaft sleeve and prolong the effective life of pulley. Specifically, the current scooter is more troublesome; In the past, I made a special oil injection inclined hole on the core column of the pulley and added sticky oil deposited on the exhaust fan; But now the pulley structure of scooter is different, and the belt drive part still has a tight shell. Even if an oil hole is added to the pulley, it is inconvenient to remove the housing.

5. The common Pritzker beads have some shortcomings, such as too small friction contact area, easy wear and deformation, or poor sliding, which leads to the failure of disk replacement. There is a new design that can replace Pritzker bead, which is a sliding tile structure with a large contact area, and its principle is better than the polygonal Pritzker bead with the latest trend. It's just that it's not easy to make this thing privately. Before the finished product leaves the factory, ordinary riders can only be in a daze. By the way, interested riders can try it themselves.

X. Fuel-saving engineering ignition system: (The content here focuses on fuel-saving performance. )

As far as I know, the ignition system of some pedal mopeds is very fragile. The next rain will strike, but it won't be started by electricity for long. There are usually four aspects that can be improved:

1. File the end of the external electrode of the spark plug into a slope shape, so that the external electrode has a tip discharge effect. At the same time, pay attention to adjust the flashover distance between the two electrodes between 0.6 ~1.0 mm. DIY is not difficult, because the electric spark is outside the electrodes, which is easy to ignite the fuel vapor and can improve the starting performance of the cooler.

2. Replace the high-voltage package with a larger one to improve the flashover voltage and ignition energy acting on the spark plug, and then the oil and gas can be adjusted more thinly.

3. If the requirements for starting and idling performance are not high, the ignition system of the whole vehicle can be replaced with an integrated igniter similar to XH90 to improve the waterproof and moisture-proof ability of the ignition system of the whole vehicle. It should be noted that some original car igniters have automatic angle changing function, while XH90 integral igniter usually has no angle changing function, so users should consider it themselves.

4, according to the specific situation of their own vehicle transmission ratio and displacement, appropriately change the ignition angle; If necessary, replace the trigger boss on the magneto flywheel and replace the igniter with a new domestic TB80 igniter invented in 2008. About the igniter and ignition angle, many posts have been made in this light skyscraper edition, and you can consult yourself if necessary, so I won't go into details here.

Engine system of fuel-saving project: (a huge topic, only one can be summarized here. )

The four-stroke engine is a kind of engine with great internal damping. The obvious performance is that the throttle changes little when going uphill or downhill. When the throttle is completely closed, the engine has a strong internal deceleration effect. Usually, when the throttle is turned off too fast, the driver will feel his body rushing forward, indicating that the four-stroke locomotive is almost equivalent to running with the brakes half-held. (two-impact locomotives usually don't have this phenomenon. )

In the full speed/idle speed fuel consumption test made in this edition, the fuel consumption per revolution of the four-stroke engine does not change much, which is about 5:3. This fully shows that the internal resistance of the four-stroke engine is large, its ventilation system consumes kinetic energy, and most of the fuel is consumed by itself, so its fuel efficiency needs to be improved. Because of the small internal resistance, the secondary impact machine is sensitive to the uphill and downhill of the locomotive. The carburetor is modified and adjusted in place, which is usually more fuel-efficient than the four-stroke locomotive. )

According to the above test data, if the internal resistance of the light friction engine is reduced by 1/2, the external output of the engine can be doubled and the fuel mileage of the locomotive will be greatly improved. It is not easy to develop low internal resistance ventilation system on four-stroke engine, so this edition has always been optimistic about two-stroke engine. Through the investigation in ZJ in 2008, it is found that the camshaft of four-stroke machine is very important. If you grind it yourself, you can greatly reduce the running resistance and greatly improve the engine output efficiency.

The earliest fuel-saving camshaft test was carried out on TS- 1 small bent beam shift car in 2007, and the fuel consumption increased from 80KM/L to120 km/L; Because there is no scooter, it was not until 2008 that I had the opportunity to do experiments on the scooter in the factory. After deducting the transmission loss of the belt, the fuel-saving camshaft still has some remarkable fuel-saving effects and the noise of the engine is reduced. This edition has a special post on how to polish the camshaft, so I won't go into details here.

It is difficult for ordinary riders to change engines. Only by using high quality lubricating oil can the internal resistance and power loss of the engine be reduced. The quality and performance of lubricating oil seems to be related to the brand and specification of the manufacturer. Usually, private testing is difficult and depends on experience. As for lubricating oil, I can't reform it myself. I'm sorry that this edition is not interested in this and has little experience.

Twelve, the tires of fuel-saving projects say: (United oil, but safety is more important. )

Motorcycle tires also have a great influence on fuel consumption. Generally speaking, under-inflation, taking one more person or adding one yard to the tire will often consume 20% more fuel. If the tires are thicker or the patterns are thicker, the vehicle will consume more fuel. Generally speaking, a big circle and thin tires will certainly save fuel, but the choice of tires is related to the overall safety of people and vehicles. On the issue of fuel saving, the issue of fuel saving will of course give way to the issue of safety. A better way is to change the diameter of the tire a little, which can give consideration to both braking performance and driving effect; Unfortunately, the choice of scooter tires is limited, so I won't say much here.