There was a spark on the scooter: possible causes and their elimination. Scooter repair by own hands

Scooters are actual, popular and practical vehicles today. People of different age categories can successfully move on them. For most owners scooter - and at all the only means of transportation. Other owners use this technique as entertainment. During the operation of Chinese and Japanese mopeds, various malfunctions may occur. One of the common problems that many have faced is the spark on the scooter. Let's consider possible reasons and ways of elimination of this trouble. Often the spark disappears at the most inappropriate for this moment, and the driver is saddened by the stalled motor. Especially often the problem is faced by the owners of Chinese technology.

General diagnostics

If the motor of the moped has decayed, first find out why it happened. After all, among the main reasons why a motor stalls on the road or refuses to start up, only two are lack of fuel or the inability to ignite the mixture. Often at the first diagnosis it turns out that the gasoline in the tank is, and the fuel mixture is fed into the cylinders due to the discharge. And so the fault is that the spark on the scooter was gone. To verify this, you just need to unscrew the candle from its regular hole in the head of the unit. Then it is inserted into the cap, its end is applied to the motor housing.

Then the engine starts and looks at the electrodes. Also check the element not only for the presence of a spark, but also for the state of the electrodes. The candle can be dry or wet. If the electrode is wet, then the fault is not the power system and the carburetor, but the absence of a spark. If the spark on the 4T scooter is gone, the reasons can be different. The most probable we will consider below.

Faulty Candle

This is the simplest reason why there is no spark on the electrodes. This kind of trouble often happens because of the quality of the fuel, and also because of the presence of various harmful impurities in the composition of domestic gasolines. Because of this, many owners of Chinese technology lost a spark on the scooter 4T (4 bars). How to check its availability?

To make sure that the candle has failed, it is necessary to install a new or exactly serviceable part instead. But there are cases when a new one is missing, and there is nowhere to buy it. Then a nail or a piece of wire will help. It is necessary to choose such devices, the diameter of which is sufficient to ensure that the wire or nail does not fall out of the cap. The element must be inserted into the spark plug, and then it is brought to the engine casing. The approximate distance from the nail to the crankcase should be 7 millimeters.

Then the crankshaft is scrolled by the starter. If the wiring harness of the scooter is fully functional, a white spark arises between the nail and the metal casing of the motor. So, the ignition system works in the normal mode, and it is necessary to replace the spark plug. You can try to clean it of carbon. So, it will work again. But most beginners do it wrong. After such purges, if a spark returns, it will take a very short time.

Clean the elements correctly

How to clean the candles from the carbon deposit correctly, every owner of motor and motor vehicles should know. Most beginners try to restore the details themselves and then wonder why they do not work. The main mistake is that the spark escapes to the body of the candle on the carbon - it is not a conductor of electricity. The motor can not be started. Plaque is formed not only on the electrodes, but also on the ceramic insulator. Therefore, it is necessary to clean not only the side, but also the central electrodes, but also an insulator.

The best effect can be achieved if you use a sandblaster. If there is not one, you can try cleaning just with sand. To do this, purchase an electric drill and sand in a bucket. Next, take a candle and for the thread on the top is clamped in the drill chuck. A large thread is wound with an adhesive tape. Then the part is lowered into the bucket and the tool is started. After a while, the electrodes and the insulator will be cleaned. If for this reason the spark is gone, the spark plug for the scooter will again work properly.

Check in appearance

The serviceable part must be clean. It is allowed only a small deposit on it. However, if the electrodes are molten or black, then the spark will not flow. Candles spoil from too rich a fuel mix. If the isolator is white, but it has small black impregnations and signs of erosion at the electrode, this indicates overheating. This is also evidenced by molten electrodes, an insulator in bubbles. If the part has oil deposits, it can be considered defective and it is better to replace it with a new one. Such a simple scooter repair with their own hands will help to re-operate this transport.

Wire breakage

This is the second simple reason. Here we have in mind a cord that connects the scooter frame and the engine to each other. This wire and its connections are the second thing to check after the candles. Be sure to make sure that the conductor is not damaged, and its contacts are not oxidized.

Clippings in a candle cap

This reason can also be attributed to simple. If the spark on the scooter is gone, then the cap should be removed, and then check its resistance level. Unplug the cap from the wire, take measurements. The probe of the multimeter is inserted into the hole for the candle. The other joins the pin, to which the wires fit. In case the cap is working, the multimeter will show about 5 kOhm. On most modern scooters, high-voltage wires, a spark plug and an ignition coil are made all-in-one. All these details are filled with rubber or compound. And so you can test the cap, the wire and the ignition coil in the complex. One of the probes of the device is inserted into the candle hole on the cap. The second is connected to the ignition coil. So identify the resistance on the primary and secondary winding and the high-voltage wire itself. Indications on the primary winding should be from 0.1 ohms to 0.4 ohms. Resistance secondary - from 6.35 Ohm to 9.7 Ohm on most scooters. Sometimes a high-voltage wire becomes unusable. To replace it you need a cable with a metal core. An automotive element with carbon filler is not suitable for this procedure.

Wiring Breaks

This happens very often, especially on scooters made in China. Here, wire breaks in the ignition system are possible. The cause may also be oxidized contacts and terminals. Scooter repair, produced by yourself, in this case consists in checking the integrity of all the wires in the ignition system. Also pay attention to the terminals. If the contacts are oxidized or keep loose, then they should be cleaned and clamped. It is not superfluous to check the wire that comes from the switch. Make sure the connection is secure and the terminal is clean.

Failure of the components of the ignition system

This is not a common cause. But if the spark on the scooter is gone and there are no apparent reasons, then it is necessary to test the switch, coil, generator winding. You can check all these devices with the same multimeter. To make sure that the winding and the pulse sensor are in good condition, one probe of the tester must be connected to the wire from the sensor and the other to the engine casing.

A normally functioning impulse sensor has a resistance of about 500 ohms. The resistance of the winding of the generator is two to three times less. If the multimeter shows infinity, then one of the components is out of order. It should be replaced with a new one. If the value is less than 150-200 Ohm, then the problem is in the feeding coil, and therefore the spark disappeared on the scooter. What to do in this situation? Buy a new generator. Such a device is subject to repair, but in the absence of time it is better to just replace it. Benefit the cost of the generator is small.

Switch

His location will find even a beginner. This is a plastic box with a terminal block. To it fit multi-colored wires. The switch is necessary for controlling the operation of the ignition system. Both the commutator and the ignition coil are made non-separable. If the element fails, then problems can only be solved by replacing. The price of these items is low - up to 500 rubles. In some SRTs there are special devices that allow testing the switch. However, in order not to search for the appropriate services for a long time, the easiest way is to purchase a new switch. In the process of finding the cause of the failure of the switch, you do not need to listen to "experts" who claim that the breakdown happened due to driving without a battery. This is an untrue opinion. The fact is that in modern scooters the power supply system, as well as the ignition system does not depend on each other.

Check the circuit before the ignition switch

To do this, connect the test lead of the tester to the wire from the commutator pad to the ignition switch. The key in the lock is turned to the "off" position. The tester should show 0 in this position, and infinity in the locked state of the lock.

Clearance of a candle

The clearance at the spark plugs is an important factor for the correct operation of the engine. This parameter plays an important role in the process of spark formation, ignition of the fuel mixture, effective operation of the scooter in the entire range of revolutions. The clearance should be specified in the documentation for a specific scooter - this parameter can vary from manufacturers. Generally speaking, for most modern four-stroke Chinese and Japanese mopeds, the spark plugs clearance is from 0.5 to 0.8 millimeters. It is necessary to monitor this parameter. For this reason, a spark may be lost. She leaves because of too much clearance.

Fuse Block

Many scooter models are equipped with short-circuit protection systems. If there is no spark, you need to find the fuse box and check all the elements in it. The fuses often burn, and they must be replaced. Then the technique will be back in order.

How not to break the ignition

Someday I'll have to cook something on the scooter. But before using welding, it is necessary to disconnect the switch and the voltage regulator. Otherwise, these elements will simply burn.