How to adjust the float of the motorcycle carburetor and how to debug the motorcycle carburetor

1. Carburetor.

The float chamber is detachable and the carburetor can be reversed.

2. Pull the floating needle.

valve the reed to adjust it.

3. Loosen the exhaust screw at the bottom of the carburetor, open the transparent exhaust pipe upwards, and observe the height of the oil level in the pipe about 1 cm from the top of the float chamber.

4. Adjust the oil level. Turn the carburetor upside down and lift the metal sheet pressed against the triangular pin brake. The key is to lower the oil level. The downward pressure point is to raise the oil level.

The correct way is to disassemble the carburetor float chamber, turn the carburetor upside down, and then measure the float height with calipers, if it is incorrect, you can pull the reed of the float needle valve to adjust. However, this method is more troublesome, you can also loosen the oil drain screw at the bottom of the carburetor, open the transparent oil drain pipe upwards, and observe the height of the oil level in the tube about 1 cm from the top of the float chamber.

If you want to adjust the carburetor to the best state in the near future, you must first understand the structure and working principle of the carburetor: when the throttle is lifted, the oil needle on the throttle is also lifted, so as to increase the amount of air intake and fuel intake, but the ratio of gasoline to air is unchanged, what changes is only the quantity, the mixture you are talking about is to adjust the proportion of air and gasoline, just like a bucket of sugar water, you pour it into a cup, the sweetness will not change, what changes is only the amount of sugar water, If you add sugar alone to the barrel, the sweetness increases, just as if you increase the concentration of the mixture to increase the concentration of the atomized gasoline entering the engine. The adjustment of the mixture ratio is multifaceted, the mixture adjustment screw adjusts the mixture ratio at idle speed, if it is easy to stall or start difficult at idle speed (even the hot car needs to open the choke to start), you need to adjust the mixture screw, clockwise selection screw is thinning, counterclockwise is to thicken the mixture.

If you feel that the oil road is not smooth or a meal in normal driving or high-speed driving, or the exhaust pipe is discharged, etc., you need to adjust the mixture ratio of the main measuring hole, due to the large amount of oil supply during medium and high-speed operation, it mainly relies on the oil supply of the main oil volume hole below the throttle, at this time, the oil supply of the idle mixture volume hole can almost be ignored, the adjustment of the mixture ratio of the main volume hole can be changed by changing the fixed telescopic length of the oil needle, the adjustment method is to remove the throttle, take out the oil needle, and there are five card slots on the oil needle, The bayonet is fixed in the middle card slot when it comes out, and if the bayonet is fixed upwards by one grid, that is, the oil needle is lengthened outward, the mixture will become thinner, and vice versa. In addition, the oil level adjustment of the carburetor will affect the proportion of mixture at idle speed and normal driving or high speed, the adjustment method is to pinch the tab of the oil float with a caliper, and the oil level of the carburetor will increase when the oil level is broken upward, and the proportion of the mixture will also increase, and the effect is the opposite downward. I don't know if you can understand that.

The carburetor directly affects the engine's power fuel consumption and exhaust gases.

Adjust the carburetor to make sure there is no engine failure in case of adjustment.

Carburetor adjustment mainly includes: oil level adjustment, mixture adjustment, and idle speed adjustment.

Clean the carburetor and check each oil needle before adjustment. Hole. Whether the needle valve is blocked. If it is a vacuum carburetor, check whether the vacuum membrane is broken.

1: Adjust the oil level only to the best liquid level. Too high can cause oil to leak or gasoline to flow into the combustion chamber and cause the spark plug to be flooded. Too low can be a result of insufficient fuel supply to the engine at high speeds.

2: Adjust the mixture. Preheat the engine for 2 minutes before adjustment, properly adjust the idle speed so that the engine does not turn off, and then slowly tighten the mixture adjusting screw in the clockwise direction, pay attention to the change of engine speed while screwing, such as when the engine speed becomes low when screwed to a certain position, stop immediately, then screw in the counterclockwise direction until the engine speed changes from low to high to high.

All right. Directly adjust the idle speed to below 1500 rpm to stabilize, and then slowly increase the throttle to see if it is smooth; whether there is black smoke coming out of the exhaust pipe, if there is black smoke coming out, it is appropriate to twist a little mixture adjustment screw in the counterclockwise direction in the trial.

3: Find the idle speed adjustment screw, tighten it is big, loosen it is small, adjust it to below 1500 rpm, so that the engine can run stably.

There are many kinds of carburetors of motorcycles, and the debugging of carburetors also has several different contents, specific debugging methods, different carburetors will also be different, and even if it is the same brand, the same model of carburetor, there will be individual differences, so the specific debugging should be combined with the actual situation. The carburetor of the motorcycle has generally been debugged at the factory, and there is no special situation that does not need to be adjusted, if it really needs to be adjusted, it should be adjusted by a repair personnel with professional maintenance experience according to the carburetor and motorcycle test run.

The adjustment of motorcycle carburetor generally includes idle speed, mixing ratio, oil level height and oil needle height, acceleration pump, throttle line stroke, damper line stroke, etc., among which the most commonly used is the adjustment of idle speed and mixing ratio. The idle speed of the motorcycle is to be adjusted when the car is hot, and it is subject to the state of the hot car, the idle speed is unstable or even no idle speed when the cold car starts, when the cold car starts and warms up, pull the damper and properly cooperate with the throttle to start and preheat it, as long as the idle speed is normal and stable after the hot car, it is fine. Idle speed is not as low as possible as long as it does not turn off, but it must reach the specified speed, otherwise if the idle speed is too low, it may cause difficulty in starting, easy to stall, engine vibration and noise, etc., and can not save fuel.

Different carburetors have different adjustment directions and adjustment turns of their mixing ratio screws, and even if they are of the same type of carburetor, the adjustment turns of their mixing ratio screws are not necessarily the same. If you suspect that the mixing ratio of the carburetor is not properly adjusted, you can first adjust the number of turns according to the standard of the carburetor mixing ratio screw, adjust the mixing ratio screw first, then start the engine to preheat, and then adjust the idle speed to the standard idle speed after the car is warmed up, and then slowly fine-tune the mixing ratio screw until the idle speed is the highest, and then adjust the idle speed to the standard speed, so adjust it again according to the above method, and finally adjust the idle speed steadily. If there is no significant change in idle speed when fine-tuning the mixing ratio screw, then simply adjust the mixing ratio screw to the standard number of turns of the carburetor.

Generally, the plunger carburetor of the small displacement horizontal cylinder machine, most of the mixing ratio screws are adjusted clockwise to thicken, counterclockwise adjusted to become thinner, clockwise to screw the mixing ratio screws to the end, and then counterclockwise to withdraw about one and a half turns. The mixing ratio screws of vertical cylinder machines and vacuum membrane carburetors above 125 are mostly adjusted clockwise to thin the mixture and thicken counterclockwise.

If you want to adjust the carburetor to the best state in the near future, you must first understand the structure and working principle of the carburetor: when the throttle is lifted, the oil needle on the throttle is also lifted, so as to increase the amount of air intake and fuel intake, but the ratio of gasoline to air is unchanged, what changes is only the quantity, the mixture you are talking about is to adjust the proportion of air and gasoline, just like a bucket of sugar water, you pour it into a cup, the sweetness will not change, what changes is only the amount of sugar water, If you add sugar alone to the barrel, the sweetness increases, just as if you increase the concentration of the mixture to increase the concentration of the atomized gasoline entering the engine. The adjustment of the mixture ratio is multifaceted, the mixture adjustment screw adjusts the mixture ratio at idle speed, if it is easy to stall or start difficult at idle speed (even the hot car needs to open the choke to start), you need to adjust the mixture screw, clockwise selection screw is thinning, counterclockwise is to thicken the mixture.

If you feel that the oil road is not smooth or a meal in normal driving or high-speed driving, or the exhaust pipe is discharged, etc., you need to adjust the mixture ratio of the main measuring hole, due to the large amount of oil supply during medium and high-speed operation, it mainly relies on the oil supply of the main oil volume hole below the throttle, at this time, the oil supply of the idle mixture volume hole can almost be ignored, the adjustment of the mixture ratio of the main volume hole can be changed by changing the fixed telescopic length of the oil needle, the adjustment method is to remove the throttle, take out the oil needle, and there are five card slots on the oil needle, The bayonet is fixed in the middle card slot when it comes out, and if the bayonet is fixed upwards by one grid, that is, the oil needle is lengthened outward, the mixture will become thinner, and vice versa. In addition, the oil level adjustment of the carburetor will affect the proportion of mixture at idle speed and normal driving or high speed, the adjustment method is to pinch the tab of the oil float with a caliper, and the oil level of the carburetor will increase when the oil level is broken upward, and the proportion of the mixture will also increase, and the effect is the opposite downward. I don't know if you can understand that.

Motorcycle carburetor.

The height of the oil needle of the throttle valve plunger is by adjusting the circlip on the oil needle.

Adjust the height of the oil needle by moving the circlip position. The adjustment of the height of the oil needle will affect the amount of combustible mixture provided to the engine, and then have an impact on the power, fuel consumption, etc., and because the oil needle is a cone, when adjusting its height, the impact on the oil supply of the carburetor is relatively large. Generally, a carburetor has only one suitable position for the height of the oil needle, and most of them have been adjusted and set at the factory, and there is no special situation that does not need to be adjusted.

If it is really necessary to make adjustments, it should also be carried out by repair personnel with professional maintenance experience, combined with the actual situation.

When the carburetor and motorcycle leave the factory, the circlip that adjusts the height of the oil needle is generally set in the middle grid, and the buried oil needle generally has five grids, that is, five adjustable positions, and the middle grid is suitable for most carburetors and motorcycles. If you change the position of the oil needle circlip without authorization and adjust the height of the oil needle, the low position of the oil needle may cause poor oil supply, insufficient throttle power, and the car will be cowardly. If the position of the oil needle is raised, it will cause the failure of excessive oil supply and excessive concentration of mixture, and will also cause failure to add throttle, insufficient power and large fuel consumption.

That is to say, the concentration of the mixture can only be just right, too concentrated or too thin is not possible, and there is only one suitable position for the height of the oil needle, and it is not possible to artificially change it high or low.

Only a small number of carburetors need to readjust the height of the oil needle due to the inaccurate factory setting, so remove the throttle valve plunger, remove the oil needle and its circlip, and adjust the position of the circlip in the oil needle groove. If you need to adjust, it is generally to move the circlip down by one grid, that is, to raise the height of the oil needle by one grid, but this requires screen experience and test drive, combined with the actual situation of the motorcycle to adjust. In addition, if it is a national three.

Emission of motorcycles, the carburetor oil needle can not adjust the height according to the regulations, but some carburetors for environmental protection standards, may be limited by the oil supply and caused by poor oil supply, so that you can add a thin copper pad under the oil needle circlip, so that the oil needle can also be raised a little higher, improve the situation that the throttle can not be added at a certain speed.

The oil needle of the motorcycle carburetor will also affect the mixing ratio to a certain extent, but generally can not adjust the fuel consumption through it, it can only be set to Tuqing in a suitable position, if artificially adjusted up or down, it may cause abnormal conditions. If the increase (refers to the adjustment is too high) will cause the mixture to be too thick and burn badly, and the low (too low) will cause the oil to be added, because the engine can not work normally, and will not achieve the purpose of fuel saving, so if it is adjusted in the case of normal vehicle conditions for more fuel efficiency, it is basically not able to achieve the purpose, and it will affect normal driving.

If the oil needle has not been moved, it is generally not its problem, and the oil lowering roller needle may cause the throttle to be added.

In addition to the black spark plug reducing the mixing ratio of the carburetor, other things such as blocked air filter, bad gasoline, aging spark plug or wrong calorific value, weak high pressure, frequent low-speed or short-distance driving, high oil level of the carburetor, improper use of the damper, aging of the carburetor or problems with the main measuring hole and main nozzle.

The main oil needle factory is in the middle of the grid, if the oil is big to put down then it will be a grid, small to mention a grid, this should be combined with the adjustment of the mixture, the idle speed is not good, the acceleration power will be abnormal, in a word, poor oil and rich oil are not the best state of Sunzhou dry mountain, if you have experience to adjust it carefully, if you don't know much about the carburetor to let the professional repairman deal with it, this is a small problem.

The float adjustment method in the carburetor of the motorcycle is as follows:

1. You can disassemble the carburetor float chamber and turn the carburetor upside down, and measure the float height with a caliper to adjust.

2. You can adjust it by pulling the reed of the float needle valve.

3. You can loosen the oil drain screw at the bottom of the carburetor, open the transparent oil drain pipe upward, and observe the height of the oil surface in the pipe about 1 cm from the top of the float chamber.

4. Adjust the oil level, turn the metal sheet pressed on the triangular needle brake up a little in the carburetor to lower the oil level, and press down to raise the oil level.