The spark plug on the scooter is flooded: reasons, what to do, how to repair

How to check spark on a scooter?

We insert the spark plug into the spark plug cap and place the spark plug on the engine so that its metal base touches any metal part of the engine. Turn on the ignition, press the start button or kickstarter foot and look at the spark plug electrodes.

If there is a spark between the electrodes, the spark plug is working
If there is no spark between the electrodes, the spark plug is broken; to be sure of this, try a known good spark plug or a new spark plug.
If there is no spark even on a working spark plug, the spark plug has nothing to do with it and the problem is not in it, but for example in the coil. switch or generator

The gap between the electrodes of the spark plug of a scooter, moped or Chinese motorcycle should be around 0.6-0.7 mm. Before installing spark plugs -B, check the gap with a feeler gauge and, if necessary, correct it by bending the side electrode

"Chinese"

We inspect the right side of the engine and if you find there a thick black wire at the end of which there will be an incomprehensible L-shaped piece of garbage inserted into the engine. Decide whether it will be convenient for you or not, if it is convenient, remove this garbage from the spark plug and, as necessary, put a special key on the spark plug and unscrew it

If inspection of the engine yields nothing, inspect the engine hood and if you see a hatch in its front part, remove it

If there is no hatch on the hood, remove either the hood or the seat tank

What kind of candle should I put?

For four-stroke “Chinese” NGK C7HSA is quite suitable

For two-stroke “Chinese” and “Japanese” NGK B7HS is suitable

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I would like to add one more thing: remove all the chips and all connecting terminals further from the cylinder head cover, since the cylinder head cover has a high temperature and under the influence of this temperature the insulation of the wires of the chips and terminals is destroyed, including the chips and terminals themselves under attack. What does this mean for you? but it threatens you with constant electrical problems, the lamps can burn out quickly (all of them, near/far/dimensions), maybe anything related to the electrical problem.

I want to add one more thing: remove all the chips and all connecting terminals further from the cylinder head cover, since the cylinder head cover has a high temperature and under the influence of this temperature the insulation of the chips and terminals wires is destroyed, including the chips and terminals themselves under attack . What does this mean for you? but it threatens you with constant electrical problems, the lamps can burn out quickly (all of them, near/far/dimensions), maybe anything related to the electrical problem.

HOW TO OPEN A MOTORCYCLE PLUG WITHOUT A SPARK WRENCH

Description
: HOW TO OPEN A MOTORCYCLE SPARK WITHOUT A SPARK WRENCH

another mopedo under repair (Chinese 4t scooter)

–> Article rating: B B
At first glance, what could be simpler: unscrew the old spark plug and screw in a new one. But! As elsewhere, there are nuances here, without knowing which you can easily, for example, “break” the thread in the spark plug hole. It is especially difficult in this matter for beginners who know almost nothing about the structure of a scooter, of course).

And so, let's first decide where the spark plug is located on your scooter. The spark plug is always screwed into the cylinder head, the head, in turn, is always installed on the cylinder, so find where your muffler is and look where the exhaust pipe of the muffler goes, on scooters with 2t engines the pipe fits into the cylinder, on scooters with a 4t engine the pipe fits directly to the cylinder head.

Depending on the scooter model, to provide access to the spark plug you have to remove the hoods or tear off special hatches; it happens that access to the spark plug is only possible from the seat tank of your scooter. So “get your bearings” so to speak.

On this scooter, to replace the spark plug, I had to remove the hood (the spark plug is shown by the arrow).

Take a spark plug wrench and a screwdriver

Remove the spark plug cap, place the key on the spark plug, insert a screwdriver into the key hole and unscrew the spark plug (right-hand thread).

After you have unscrewed the spark plug, carefully (otherwise the spark plug may fall out of the key into the cooling casing) pull it out of the hole along with the key.

We take a new spark plug and, just in case, check the gap between its electrodes; on most scooters it should be 0.6 - 0.7 mm (it may be different on your scooter). If necessary, correct the gap by bending or straightening the side electrode.

In the same way, insert a new spark plug into the key and carefully so that it does not fall out of the key, insert it into the spark plug hole. When twisting the candle, carefully ensure that it is wrapped “along the thread” without distortion. At the very beginning, the candle should be wrapped using the force of your fingers, then as the candle enters the hole, the force gradually increases. If your spark plug is tight from the very beginning, it means that it most likely did not go “along the thread” - in this case, unscrew it and tighten it again. There is no need to tighten the candle too much, just tighten it slightly and that's enough.

Section: Scooter repair

The spark plug plays an important role in the design of a scooter. The spark plug must always correspond to the rating specified by the scooter manufacturer, have the correct gap, and have minimal carbon deposits on the electrodes.

Ideally, the spark plug electrodes should be light brown, without noticeable deposits of carbon deposits and rust. The formation of a velvety soot indicates a rich mixture or excessive wear of the CPG. White electrodes with a clear sign of melting or overheating indicate a lean mixture when the proportion of oxygen to gasoline is increased.

In any of the above cases, it is necessary to adjust the quality of the mixture. If the adjusting screws on the carburetor do not respond to adjustment, as well as the movement of the needle, it is obvious that the carburetor is clogged or the wear of the CPG has reached a level where it is impossible to do without replacing the elements of the piston group.

With a properly running engine and a properly tuned carburetor, as discussed above, the color of the spark plug on the scooter should be light brown. Like any element in the design of a scooter, the spark plug has a nominal service life, after which it is recommended to replace it, regardless of the presence of damage or deviations. It is recommended to replace it every 8-10 thousand kilometers.

Let's look at how to properly replace a spark plug on a scooter.

Scooter manufacturers, as a rule, provide various hatches and compartments in the design to facilitate access to the spark plug. If there are none, access is provided from the bottom or from the rear wheel, as, for example, on Honda Dio AF-18, 27, etc. scooters.

Hatch covers can be fastened with self-tapping screws, bolts, nuts, with a key or by snapping, depending on the design of each individual scooter model. To unscrew the spark plug, you need to remove the cap, which supplies voltage to it via a high-voltage wire. It is enough to pull the cap forcefully away from the cylinder head to disconnect the contact.

Using a spark plug wrench, unscrew the spark plug counterclockwise with sufficient force. It is enough to tear it out of place, then you can easily unscrew it with your hand, the main thing is not to get burned if the engine is still hot.

Removal of the spark plug can be carried out for the purposes of prevention, cleaning, checking and adjusting gaps, as well as replacement. Replacement is carried out when obvious defects in the part itself, as well as defects in the electrodes, are visible. Replacement is also carried out after the service life has expired. As mentioned at the beginning, it averages 8-10 thousand km.

We install the new spark plug in place and first tighten it by hand, then carefully tighten it with a socket wrench, applying sufficient force, but you should not overdo it so as not to break the thread of the cylinder head, which is made of aluminum. If you have a torque wrench, it is important to maintain a force of 18-20 Nm. We put the spark plug cap back in place, making sure that it snaps into place. The scooter is ready for use.

Also in this section: Keep the conversation going!

Answer someone else's question or ask your own question in the comment box. Scooter riders communicate here.

On some scooter models you can get to the spark plug without removing any plastic, seat or hatches. On other models, you can get to the spark plug by removing a special hatch on the engine hood; on others, you will have to remove the saddle, then the seat container, and only then can you get to the spark plug.

Solutions to the problem

Initially, you need to understand what exactly the problem is, and then decide how to repair it. If the cause is found, then other problems should not be ruled out, since there may be a connection between them. Need to:

Check battery charge. In winter and autumn it must always be charged, since the power of the spark also depends on this factor. This is primarily important for old vehicles - their battery life has already been partially exhausted.
Check the quality of the fuel. You should only refuel at proven gas stations. When using low-quality fuel, the scooter may stall or not start at all at the most inopportune moment.
Choose the right oil. Much also depends on its viscosity and quality. For cold weather, winter fuels and lubricants must be used.
Check that the valves are correctly adjusted on a scooter with a 4t engine. If mistakes are made, fuel will enter the chamber at the wrong time and will not ignite.
Check the air filter as it may need to be replaced or cleaned.
Adjust the carburetor screw and the quality of the mixture if gasoline is supplied through it.
Make sure the spark plug is working correctly. If necessary, adjust the gap between the electrodes, replace the spark plug or ignition coil.

Attention!
If the spark plug is flooded, you need to load the engine at high speeds at least once a week. In this way, you can blow out the cylinder and spark plugs from accumulated carbon deposits.

If you have doubts about your own abilities, then you should turn to specialists.

How to check the spark?

If there is a spark between the electrodes, the spark plug is working
If there is no spark between the electrodes, the spark plug is broken; to be sure of this, try a known good spark plug or a new spark plug.
If there is no spark and there is a working spark plug, the spark plug has nothing to do with it and the problem is not in it, but for example in the coil, switch or generator

Switch

Even a beginner will find its location. This is a plastic box with different colored wires attached to it. The switch is necessary to control the operation of the ignition system. Both the switch and the ignition coil are made non-separable. If the element fails, then the problems can only be solved by replacement. The price of these parts is low - up to 500 rubles. Some service stations have special instruments that allow you to test the switch. However, in order to avoid searching for the appropriate services for a long time, the easiest way is to purchase a new switch. In the process of searching for the reason for the failure of the switch, you do not need to listen to “experts” who claim that the failure occurred due to driving without a battery. This is an unreliable opinion. The fact is that in modern scooters the power supply system and the ignition system do not depend on each other in any way.

How to check the spark?

If there is a spark between the electrodes, the spark plug is working
If there is no spark between the electrodes, the spark plug is broken; to be sure of this, try a known good spark plug or a new spark plug.
If there is no spark and there is a working spark plug, the spark plug has nothing to do with it and the problem is not in it, but for example in the coil, switch or generator

Causes of malfunction

Due to a flooded spark plug, the scooter may not start at all or may be unstable. So, what could be the reason:

Clogged air filter. Insufficient air supplied to the carburetor enriches the fuel mixture. As a result, a large volume of fuel does not have time to burn in the chamber, and the spark plug becomes dirty.
Incorrect carburetor adjustment. A tightened mixture quality screw on the carburetor has almost the same effect as a clogged air filter.
Faulty ignition system. There are several faults at this point: faulty spark plugs - bad wires - problems with the ignition coil - incorrect timing (on old equipment, for example).
Poor quality fuel. Gasoline diluted with another liquid greatly affects the contamination of the spark plug.

Oddly enough, the spark plug on the injector can also flood. This usually happens in winter on worn-out engines. Since the quality of the mixture is regulated by an electronic control unit (ECU), it would seem that the spark plugs should not be flooded.

However, poor compression, a discharged battery, a bad starter, an insufficiently powerful spark and incorrect electrode gaps do not allow the scooter to start at subzero temperatures. In cold weather, the ECU supplies more fuel to the cylinder, since cold air contains more oxygen than hot air.

For a number of reasons described above, the scooter does not start and the spark plug is flooded.

Circumstances under which the spark plugs will not fill with gasoline

Of course, these are exemplary conditions, but you can check many of them so that you don’t have to face the morning in a minibus or metro while going about your business.

So, the key criteria are:

well charged battery and working starter
high-quality oil with appropriate parameters for the frosty season
spark plugs and high voltage cable are of high quality and trouble-free
The injector nozzles were cleaned and adjusted in a timely manner. Preferably not with the help of various additives in the tank, but with the use of equipment for cleaning injectors
high quality gasoline

People's advice: if you want the engine to start perfectly in cold weather and the spark plugs not to be filled with fuel, the engine must be “twisted” periodically, once a month. Distance 50-100 km at above average speed and on good fuel.

Or once every two days, while moving, give the motor a load at increased speed for 10 seconds so that self-cleaning of carbon deposits and deposits in the chamber occurs.

These conditions are easy to control on your own, without the help of car service professionals.