How to adjust the concentration of the carburetor mixture for a motorcycle?

The top one is the screw for mixing the gas, and the one on the bottom is the oil drain screw with a black rubber pipe nearby. The mixture screws of this carburetor are screwed clockwise into the mixture and unscrewed counterclockwise. The general adjustment method is to withdraw one and a half to two and a half turns after screwing to the bottom, and the more you twist it out, the thicker the mixture.

This kind of carburetor has a temperature-controlled enrichment valve (that is, an electric damper), which will automatically be thickened when starting, and because the quality of the carburetor used in the moped is relatively poor, in addition to checking the concentration of the carburetor mixture, it is also necessary to check whether the oil level of the carburetor is high, whether the electronic enrichment valve is normal (whether it can not be completely closed after the car is warmed), and check whether the vacuum fuel tank switch will flow oil through the suction pipe (leading to the carburetor and the engine intake pipe, connected by a three-way tube).

The black circle in the picture below is the gas mixture screw, which has to be reviewed and will come out after a while.

The concentration of the carburetor mixture on a motorcycle varies from car to car, with some being concentrated clockwise and diluted counterclockwise, while others are reversed, and the number of laps is different.

You can first stabilize the idle speed after the car is warmed up, then tighten the gas mixture screw to the end and exit for a circle and a half, on this basis, try to adjust left and right until the idle speed is the highest, and then adjust the idle speed steadily, and so on 2 or 3 times. This method can be applied to almost all motorcycles, if you are not sure to get it right, it is best to go to the place where you bought the car to adjust it after sale.

Hello! New cars don't have to rush to mix. The mixing is too thick and the filter is too dirty, so clean it first. Adjustable idle screws for unstable idling. If it is still thicker, adjust the mixture than the screw, which is generally concentrated clockwise and thin counterclockwise.

When in doubt, please ask.

Share how to adjust the carburetor of a motorcycle.

Thin inward, thick outward.

A carburetor is a mechanical device that mixes a certain proportion of gasoline with air under the action of vacuum generated by the operation of the engine. The carburetor is a delicate mechanical device that uses the kinetic energy of the inhaled air stream to atomize gasoline. Its important role in the engine can be called the "heart" of the engine.

The complete device should include a starting device, an idle device, a medium-load device, a full-load device, and an acceleration device. The carburetor will automatically mix out the corresponding concentration according to the different working state requirements of the engine, and output the corresponding amount of mixture, in order to make the mixture mix more uniformly, the carburetor also has the effect of atomizing the fuel for the normal operation of the machine.

How to adjust the mixing ratio of motorcycle carburetor? The professional master will tell you in detail today.

Motorcycle Mix Ratio & Idle Adjustment Special 2021

Take engines with a displacement of 110 and below as an example, (for vacuum membrane carburetors above 125, the mixing ratio adjustment is the opposite of that of 110, and the effect is the same as that of dilution and concentration).

First ensure that the four-stroke motorcycle can start, warm up the car for more than 10 minutes after starting, or drive about 5 kilometers, and then hang zero gear, adjust the neutral state clockwise (fast), and increase the idle speed as much as possible, including the idle speed at this time, and then slowly adjust the mixing ratio screw counterclockwise (diluted), at this time:

1. If the idle speed does not change when the mixing ratio screw is diluted, it means that the mixing ratio can no longer be thinner, so adjust the idle screw counterclockwise to the idle speed steady, at this time, you can also adjust the mixing ratio screw slightly thicker clockwise, if the idle speed becomes lower, it will be slightly lower, and it will be adjusted a little lower.

2. If the idle speed of the dilution mixing ratio is reduced, it will be reduced to a stable state and stopped, and then the idle speed screw can be increased, and the mixing ratio can be repeatedly adjusted if it is high.

3. When adjusting the thinning mixing ratio screw, the idle speed is still high, so it should be adjusted to a stable direction in the direction of thickness. If the left and right mixing ratio screws are increasing or decreasing the idle speed at this time, adjust to the most stable point and do not move the mixing ratio again. If you feel that the idle speed is not stable enough at this time, you will slowly only fine-tune the idle speed to stability, if the left and right idle speed adjustment screws are high or low at this time, then stay at a relatively stable point, and basically adjust it.

This is a more fuel-efficient way to adjust, you may need to close the damper properly when starting the cold car, but after a while, the idle speed will be normal, and the spark plug is not easy to accumulate carbon, and the exhaust pipe does not emit black smoke.

Hello! The carburetor mixing is thinner than the rotin clockwise than the mixing ratio, and the counterclockwise rotation is the thickening! The right way to adjust:

First, screw the throttle rodin and the mixing ratio rodin to the end, start the engine, then loosen the mixing ratio to increase the idle speed of the rodin, then loosen the throttle rodin to decrease, and then loosen the mixing ratio rodin, so that until the speed of the loose mixing ratio rodin engine no longer rises.

Tightening is thin, that is, clockwise!

Due to the different types of carburetors used and specific models used in motorcycles, the methods of adjusting the mixing ratio of carburetors are also different, including the location of the mixing ratio screws of different carburetors, the adjustment direction of the mixing ratio screws, and the number of adjustment turns of the mixing ratio screws. And because there are individual differences between carburetors, even if it is the same brand and model of carburetor, the number of adjustment turns of its mixing ratio screws is not necessarily the same, and some will be different, which needs to be adjusted in combination with the actual situation and maintenance experience.

The mixing ratio screw of the motorcycle carburetor has both clockwise screwing in and dilution and counterclockwise exit, and just the opposite, clockwise screwing in is dilution and counterclockwise exit is thickening, so before adjusting the mixing ratio of the carburetor, the first thing is to determine its mixing ratio according to the type of carburetor The screw adjustment direction and the basic number of adjustment turns. The mixing ratio screw of the carburetor has generally been adjusted at the factory, and there is no special situation that does not need to be adjusted, if it is really necessary to adjust, it should also be adjusted by the repair personnel with professional maintenance experience, combined with the actual situation, otherwise improper adjustment will affect the use, resulting in unsatisfactory performance, and may even cause failure.

Generally like the carburetor used in small displacement horizontal cylinder motorcycles, most of their mixing ratio screws are screwed in and out of the concentration clockwise, and the mixing ratio screws are screwed clockwise to the end, and then withdrawn counterclockwise for about one and a half turns. For vertical cylinder engines above 125cc, as well as vacuum membrane carburetors used in various straddles and scooters, most of their mixing ratio screws are screwed in and diluted clockwise, and counterclockwise exit is concentrated and concentrated. It is also because of possible individual differences, and sometimes it is necessary to fine-tune according to the actual situation.

The mixing ratio screw of this carburetor is tightened clockwise and thinned clockwise, and the more you exit the mixture, the thicker it is. The color of the spark plug is very black, and the exhaust gas smells oily, which is mostly caused by the mixture of various reasons. For example, the air filter is blocked, the mixing ratio of the carburetor is not adjusted properly, the damper is used improperly, the position of the oil needle is too high, the oil level of the float chamber is too high, the main measuring hole is too large or the main nozzle is problematic, and the quality of the carburetor itself is too poor.

The mixing ratio screw of this carburetor is generally screwed to the end and then withdrawn two to two and a half turns, the possibility of the oil level being too high is small, and the condition can be replaced with a good carburetor to try, and some carburetors are not well adjusted, so they can only be replaced as a whole. In addition, frequent driving at medium speed or short distances, inferior spark plugs or improper calorific value of spark plugs (less likely), and weak high voltage can also easily cause spark plugs to turn black. As long as the color of the spark plug is normal, the fuel consumption is not excessive and the spark plug is not frequently damaged, there is no need to care too much about its color.

The carburetor mixture screw is dilute and the left-hand is concentrated.

Different motorcycles, the carburetor mixing ratio screw adjustment direction is also different, horizontal engine (mostly used for bending beam Lu Tuo or old-fashioned motorcycles) and some old two-stroke vehicles, carburetor mixing than the inner screw is more clockwise twisting to adjust the concentration chain difference, counterclockwise twisting thinning.

The vacuum membrane carburetor used in scooters and some straddle bikes, as well as the plunger carburetor used in straddle motorcycles above 125, has a mixing ratio screw that is screwed clockwise to dilute and counterclockwise to be concentrated.

It depends on which carburetor it is, the general vacuum membrane carburetor or the carburetor used for straddle bikes above 125 is mostly tightened and thinned clockwise, and the carburetor used in some horizontal small displacement engines and some carburetors of old-fashioned two-stroke cars are mostly tightened clockwise and diluted counterclockwise, which is just the opposite. In addition, the carburetor used in different models, the number of times of the gas mixture screw adjustment is not the same, even if the same car is used in the same type of carburetor, installed in different cars sometimes have differences, it is best to be adjusted by experienced after-sales maintenance personnel, combined with the car condition.

It's thick inside, I don't understand it, don't be blind.

Each one is different, you turn slowly, and the speed becomes faster is to adjust the thickening, and vice versa is to dilute.

Clockwise is thickened, counterclockwise is rare.

Adjustment method of ordinary carburetor:

1. There is another screw on the side of the idle adjustment screw (some are in other positions, such as the vacuum carburetor connected to the end of the engine on the top), and tighten it to the tightest (at this time, the concentration is the highest, and the engine idle speed is unstable).

2. Adjust the idle speed after starting the engine, so that the engine can stabilize the idle speed normally.

3. At this time, adjust the mixture adjusting screw - gradually and slowly loosen it, and at the same time observe the change of idle speed, and adjust it to the highest point of the idle speed until it is like a lead section (it must be adjusted when the engine is running). Note: If you want to adjust back and forth, when the idle speed rises too much during adjustment, a little lower idle speed can help to identify subtle changes in idle speed.

4. After adjustment, run idle for a few minutes, wring out the spark plug after the ignition is turned off, and observe the color of the cautery: black - the mixing concentration is too high, yellow - the mixing concentration is appropriate, and white - the mixing concentration is too low.

5. Fine-tune again according to the color of the spark plug, tighten and adjust the thickness, loosen and dilute.