To 65 (carburetor). Adjusting the carburetor K 65

For a long time, domestic motorcycles, mopeds and even snowmobiles had a carburetor K 62 in its design . However, a number of defects of engineers in this model were revealed. Modern conditions required the improvement and modernization of this device. Therefore, in the 90s of the XX century, the model K 65 (carburetor) was created. This device looks similar to the previous device. But its content is significantly different from it. This is reflected in the principle of operation, regulation and arrangement of the variety K 65.

Carburettor arrangement K 65

To adjust the carburetor model K 65, you first need to familiarize yourself with its device. The approach and maintenance of the fuel level occurs according to the following scheme. Through the union fuel is supplied to the valve with an elastic lock washer. This unit rests on a tongue that communicates with the floats. They are made of plastic and are interconnected. The floats freely rotate along the axis.

In the event that there is more fuel, its excess is diverted through the drainage hole from the float chamber. Model K 65 (carburettor) heats up during operation. In this case, in order to prevent the pressure in the chamber from increasing, it is connected with a balancing channel.

The next system to be considered in the K 65 carburettor scheme is the dosage device.

Dosing system

The components of the dosing system are the main fuel jet, the nebulizer, the air supply channel and the throttle needle.

The whole process of the system works according to the following scheme. From the float chamber, the fuel enters the atomizer through the main jet. Under the action of liquefaction, it rises through the gap between the throttle needle and the nebulizer. At the exit from it, the fuel is mixed with air, which entered through the opening in the sprayer body through the channel.

The carburettor K 65 has the following engine management system. The throttle needle is set to one of five positions. This performs the operation of the engine in medium modes. But at the highest power should be taken into account when tuning that the carburetor model K 65 determines the fuel consumption through the capacity of the main fuel jet.

Under the fuel tube there is a lock washer. It provides the attachment of the sprayer.

Idling system

Another important system, which should be taken into account when adjusting the carburetor K 65, is the idling device.

The presented system consists of a fuel tube, an air channel, an idle hole, screws of quality and quantity of a mixture, a transition hole.

When the engine is running at low speed, an emulsion is formed. This occurs by raising fuel through the tube under the influence of vacuum in the mixing chamber. The fuel is connected to air, which flows through the channel. Carburettor K 65 assumes emulsion output at low revs only through the idle hole.

As the revolutions increase, the vacuum in the area of the hole increases. Through it also begins to receive the same emulsion. So the fuel supply increases with the engine speed increase.

Engine starting and heating system

In search of an answer to the question of how to adjust the carburetor K 65, it is necessary to familiarize with the device for starting and heating the engine.

On the carburetors K 65C and K 65B there is a starting device with an autonomous drive, at K 65G and K 65ZH - with a cable drive (found in motorcycles "Dnepr", "Ural"), and for K 65I, K 65D - corrector heater Is used in mopeds of the brand "IZH").

Start-up with a stand-alone drive has a plunger, a trigger, a needle, a protective cap, channels, a control rod, a fuel well and openings. The normal position of the device is considered closed.

The starting device with a cable drive is very similar to the previous version, except for the presence of a rod. The position of the plunger is regulated by a rope.

The corrector-beneficiary is characterized by such a functioning system in which fuel enters the launch device from the float chamber. The fuel consumption is limited to a jet. Such a device often has a Soviet carburetor K 65. "IZH" can serve as an example of such motorcycles.

Installation and configuration

Before adjusting the new carburetor K 65, it must be installed and adjusted.

First, remove the carburetor cover. The throttle spring holds the needle through the lock. It has one round and two shaped holes. A circular slot located in the center serves to secure the gas cable. A T-hole is necessary for attaching the propeller rod.

Installing the carburetor on the engine, connect the cable to the throttle, fix the lid.

Use the throttle stick to raise the throttle and check whether the diffuser opens completely. These actions should be performed several times. The diffuser should open and close freely, without jamming.

Then follow the screw to raise the throttle so that a gap of 3 mm appears between its edge at the bottom and the generatrix of the diffuser.

If the device K 65 (carburettor) has a corrector, it should be removed in the assembly and attach the cable to the piston. After this, the unit should be replaced.

Next, adjust the position of the cable sheath stops in such a way that their free path is 2-3 mm.

The screw should be wrapped up to the stop, after which weaken it by 0.5-1.5 turns. The fuel hose is connected to the union. Fuel should not leak over the junction points.

Then the starter turns and the crankshaft rotates 3 turns. The ignition is switched on and the start is made. After warm-up, the starter or the corrector can be turned off.

Fuel level adjustment

Adjusting the carburetor K 65 starts with setting the fuel level. For this purpose, the device is turned over and the bottom of the float chamber is removed. Next, the distance from the connector to the line that separates the float into two parts is replaced.

This distance is usually 13 mm with a possible deviation of both sides by 1.5 mm.

If the size does not fit into the carburetor, the tongue of the float must be bent in the desired direction.

It happens, the carburettor setting K 65 is correct, but it starts to "pour". This means that the float has lost weight.

Check this theory is simple. It is necessary to collect in a bath of warm water and to immerse in it a float for a minute or longer. If bubbles appear, it means that the float is defective.

Mixing of the mixture

Before starting the adjustment, be it carburetor model K 65 motorcycle "Ural", "Dnepr", snowmobile "Buran" or other vehicles, the engine should be warmed up.

Then, the minimum stable idle speed is set. To do this, the screw should be lowered throttle. After that you need to increase the number of revolutions to the maximum possible. The screw is rotated in this or that direction.

Slowly, the number of revolutions is again reduced and increased. This should be done 2-3 times.

After the performed manipulations, it is necessary to check how the engine reacts to the position of the throttle stick. To understand how to adjust the carburetor K 65, you need to determine the required level of enrichment of the fuel mixture for the engine.

For this, an experiment is made. The throttle opens sharply. If the engine stalls, then the mixture should be enriched. To do this, wrap the mixture quality screw 1/4 or 1/2 turn.

A crumbling motor with a sharp closing of the throttle indicates the need to make the mixture more poor. The screw of quality of a mix thus it is necessary to rebuild on 1 / 4-1 / 2 turns.

Mixing quality control in operation

Adjustment of carburettor K 65 under operating conditions is performed by moving the needle of the dispenser relative to the lock. This should be done in a certain order.

The dosing needle is set to the middle position. To make the mixture deplete, the lock moves upwards. In this case, the gap between the dispenser cone and the sprayer wall becomes smaller.

Shifting the lock down will result in the enrichment of the fuel mixture.

The signal of the need for adjustment will be the color of the electrode insulation of the spark plug. It should be paid attention after 30 km of run. Under normal conditions of operation, its whitish color indicates the poverty of the mixture. An insulator of dark brown color with traces of soot speaks about the need to impoverish the mixture.

Adjustment of carburetor motorcycle "Ural"

For example, adjusting the carburetor K 65, you can consider this procedure on a motorcycle "Ural".

First you need to remove the air suction. Then screw the screws out with a flat screwdriver. Carburetor To 65 motorcycles "Ural" requires screwing out the screw for 1 turn.

After that, you need to put the play on the cables. It should be the same and equal about 3 mm.

Having warmed up the motor, start to screw the idle screw to the minimum steady speed. Then with the help of a screw of quality of a mix it is necessary to find the maximum turns. The procedure is repeated twice. The carburetor is set up.

Synchronizing the carburetor

After tuning, the carburetor K 65 ("Ural") must be synchronized. It is convenient to do this with a tachometer. For lack of such equipment, synchronization can be performed on a speedometer.

To do this, the motorcycle is placed on the pedestal and the engine is started. Exhibited 4th gear. With one of the candles remove the cap and bring the readings of the speedometer to a mark of 50 km / h. The gas handle is fixed with a bolt.

One cylinder turns on alternately, and the other turns off. The length of the cables is regulated by means of fittings. At the same time, they achieve the same speedometer indicator.

The cap of the spark plug must be grounded when removed, short for the weight of the motorcycle. Thus, you can adjust the carburetor "Ural".

Adjustment carburetor To 65 motorcycles "IZH"

A more simple adjustment is made for the motorcycle "IZH", which has a corrector-enrichment.

First, the engine warms up. Then set low, but stable engine speed. To do this, rotate the screw that adjusts the throttle position.

Then gradually increase the speed to the maximum with an idle screw. The procedure is repeated 4-5 times. At the same time, the engine speed gradually decreases. After this, the correct settings are checked by sharp jerks of opening and closing the throttle.

The engine should not stall and make sharp jerks.

For such a carburetor model, it is also possible to carry out adjustment in operating mode by moving the metering needle upwards to enrich the mixture and downwards for the reverse effect.

This kind of customization is one of the easiest. Therefore, you can do everything yourself according to the instructions.

Having familiarized with the device, a way of installation and adjustment of such element of a motorcycle, as To 65 (carburettor), each user can independently regulate its work. For each type of vehicle, you must follow your carburettor setting and testing technology. On the correctness of the performance depends on the longevity of the vehicle.