How to adjust the carburetor on a scooter: step by step instruction

The fuel delivery system to the engine, which acts as a carburettor, is one of the important components of a vehicle such as a scooter. From the correctness of its work depends the functioning of almost all mechanisms. Therefore, periodically the carburetor needs maintenance.

Each owner of the presented vehicles should understand the procedure for adjusting this system. How to adjust the carburetor on a scooter, will help to understand the advice of experienced mechanics. They will give several recommendations on how to carry out maintenance qualitatively and quickly.

The value of the carburetor

Before setting up the carburetor on the scooter, it is necessary to once again study the purpose of this system. This will help to assess the importance of periodic holding of such works.

In the carburetor, the mixture of fuel (gasoline and air) is mixed before it is fed into the engine cylinder. From the correct operation of this system depends on the longevity, speed and power of the engine, fuel consumption, and, importantly, the safety of driving.

The adjustment process should be approached in a comprehensive manner. Some owners of the presented type of vehicles by ignorance underestimate the importance of such carburetor maintenance. At best, the inexperienced driver adjusts only the fuel quality screw. This gives the result, but only when the engine is running at low or idle.

Signs of necessary adjustment

There are several basic signs that make it clear to the driver that it's time to carry out maintenance of your vehicle. They can not be ignored. Otherwise, repairs will be much more expensive. In this case, learn how to properly configure the carburetor on a scooter, as soon as possible.

First of all, the engine's power drops. This can also be observed due to the wear of the motor systems. The cylinder-piston group may require replacement. However, an incorrectly tuned carburetor is also able to affect the power of the motor. If it supplies more air to the mixture than required, the fuel becomes depleted. This leads to overheating and reduced capacity.

If the engine refuses to work at all, this can also be evidence of an incorrect carburettor. However, in order to find the cause of the failure, it will be necessary to check several basic systems.

If the engine starts, but stalls, it can be a consequence of clogging in the carburetor. In any case, the driver must answer responsibly to the problem of solving any problem associated with his vehicle.

Maintenance procedure

A carburetor breakdown is the most common problem of a vehicle such as a scooter. On sale there are engines of four-stroke (4t) and two-stroke (2t) type. The engines produce 50 and 150 cubes. The differences in them are not significant, so the adjustment in all systems is almost identical.

It is much easier to set up a carburetor scooter Honda Dio. Therefore, many automotive mechanics use this technique for example in the training of inexperienced drivers. During the adjustment, a number of manipulations must be performed.

First of all, the carburettor is adjusted at idle speed. Then, with the help of a special screw, the balance of air and gasoline in the fuel mixture is leveled. This operation can be performed by moving the needle. The final stage is to control the fuel level in the float chamber.

Before tuning, the carburetor must be removed and washed. Only after this you can make the adjustment.

Removal and cleaning

Before setting up the carburetor on the Honda Dio scooter, taken as a simple example, it is necessary to remove and clean this system. To do this, all plastic elements that prevent this process are dismantled (seat and plastic under it).

If the engine is 2t, fuel and oil hoses are disconnected (there are no oil outlets on the 4T-motors). Contacts of the concentrator are removed. Then simply unscrew the bolts securing the carburetor and get it out. Its external elements are cleaned of dirt.

Next, you need to partially disassemble the fuel supply system. Unscrew bolts securing the cover of the float chamber (it is thoroughly rinsed), the float is removed. Then the carburetor is rinsed. The system is collected in the reverse order and set in place.

Carburetor cleaning

Before setting up the carburetor on a scooter 2t or 4t, you should thoroughly clean the system's mechanisms. To do this, you can use one of two methods. In the first case, the carburetor is washed with gasoline and purged with a compressor. The equipment should have a nozzle in the form of a pointed tip.

If there is no suitable equipment at hand, you can purchase a special liquid for washing the carburetor. With its help, all channels, parts and elements are easily cleaned. The liquid is in the can. Therefore, it is fed inward under pressure. This principle helps to purge even narrow channels.

Dry the internal systems after washing is not necessary. Simply assemble the systems in reverse order. Then you can make the adjustment.

Idling adjustment

Studying how to adjust the carburetor on a scooter 4t or 2t, it is necessary to take into account that there are no fundamental differences between these types of engine. In some engine models, the fuel mix adjustment screw may be missing. It is corrected only by adjusting the needle, the float.

Before starting work it is necessary to warm the motor for 10-15 minutes. An idling screw is installed on any scooter. To find its location, please refer to the manufacturer's instructions. With it, you can adjust the stability of the revolutions at idle.

If the screw is turned clockwise, the number of revolutions increases and vice versa. The adjustment is made until the motor is stable.

Quality of mixture

Considering how to adjust the carburetor on a scooter (150 cubes or 50 cubes), it is necessary to pay special attention to the quality of the combustible mixture. If the amount of air in it exceeds the permissible concentration, the engine will overheat, its power is reduced. If the air, on the contrary, is less than that established by the equipment manufacturer, soot settles on the combustion chamber. Over time, this causes a failure of the engine.

Adjustment should be made with a screw. It is better to find it with the help of the manufacturer's instructions. To adjust the carburetor scooter (50 cubes, 150 cubes), you need to turn the screw. Clockwise rotation will lead to fuel enrichment, and counterclockwise to impoverishment.

If the screw does not, you will have to use the possibility of adjusting the carburettor needle. When it is raised, the mixture becomes rich, and when it is lowered, the mixture becomes poor.

Mixing control circuit

Considering how to adjust the carburetor on a scooter 4t or 2t, it is necessary to study the sequence of actions of such adjustment. First of all, the motor must be warmed up within 15 minutes. Then it must be muffled.

Turn the screw clockwise until it stops. Then it must be released again by 1.5 turns (no more). The engine is started. At this time, the screw is pressed 1/3 turn. The motor runs for 2 minutes. If the revolutions increase, turn the screw a quarter of a turn counter-clockwise. Again you need to wait 2 minutes. This is done until the revolutions begin to fall.

When the speed of rotation falls for 2 minutes, the screw is also tightened in the opposite direction, also by a quarter of a turn.

Medium and high speed setting

If there are deviations in the preparation of the fuel mixture at medium revs, the adjustment screw will not help to fix the problem. Therefore, in this setting mode, you need to resort to using a throttle needle. Most often it can be in 5 positions.

Studying how to adjust the carburetor on a Chinese scooter, you can not ignore the adjustment at high engine speeds. This procedure occurs when the throttle valve is fully open. The quality of the mixture can be determined only when selecting the size of the main jet.

When the engine needs to enrich the fuel, the presented part must be larger and vice versa. The size of the jet can be viewed on the body of the part. Replacement is made only in case of urgent need. It is quite problematic to perform such work independently.

Signs of deviation in the preparation of the mixture

Studying the technology, how to adjust the carburetor on a scooter 2t, 4t, the driver should know what factors indicate the deviations in the process of cooking the fuel mixture. If it is depleted, when the vehicle reaches a high speed, claps will be heard from the system. The carburetor plug will be white. Electrodes can in some cases melt due to work at too high temperatures. Also, the scooter will react poorly to the rotation of the handle of the gas when the upper limit is reached.

If the mixture is rich, a large overrun of fuel will be determined. On candles of ignition will settle black carbon. From the muffler black smoke and claps will be pulled out.

But with proper adjustment, these phenomena will not appear. The engine will work evenly at all speeds. There is no overspending of gasoline. At any speed, the throttle stick will be informative, and when inspecting the candle, carbon and soot will not be detected. Its color is slightly brownish (not white).

Fuel level adjustment

The final stage in considering the topic of how to adjust the carburetor on a scooter is the adjustment of fuel in the float chamber. This is a simple but important procedure. Check the fuel level using a transparent tube. It is located at the bottom of the carburetor.

The drain screw must be unscrewed. The tube goes up. In it, you can estimate the level of fuel in the tank. At the same time, the engine must be in operation. The tube should be higher than the carburetor. The level of gasoline should be determined slightly lower than the border of the lid.

If the fuel is small or too large, it is necessary to remove the cover and adjust the trigger time of the needle. At the same time, the cradle of the holder needs to be bent, but in very small ranges. Such adjustment should be carried out in stages, otherwise the result will be temporary and the adjustment will not have the proper effect.

Having considered the technology, how to adjust the carburetor on a scooter, each owner of such a vehicle can make the procedure himself. Adhering to the recommendations of professional auto mechanics, as well as carrying out maintenance on time, you can significantly extend the life of the carburetor and engine. Therefore, due consideration should be given to adjustment issues.