Mopeds made in China break down quite often, this depends not only on poor-quality parts, it is important to operate the moped correctly and monitor the condition of its parts. But many owners of Alpha mopeds are faced with a problem when their vehicle simply does not start. After reviewing most of the possible causes, the owner notices that there is no spark on the moped. Without a spark, the moped will not start, and there can be several reasons for the breakdown. Most of the reasons are quite banal and lie in minor breakdowns, but if all the steps below do not help, you will have to completely rebuild the moped or take it to a specialist. Diagnosis of lack of spark is carried out in several procedures below.
The moped has lost spark, what should I do?
Very often the reason that the engine does not start is the lack of a spark at the spark plug. This is diagnosed very simply:
- you need to unscrew the spark plug from the engine (or take a spare one),
- put a candle cap on it,
- turn on the ignition,
- press the spark plug to ground
- crank the engine with the starter, or better yet, with the kickstarter.
If a spark does not jump between the electrodes of the spark plug, the engine will not start.
But fortunately, the ignition system on Alpha mopeds is quite simple and you can find the fault on your own.
I always try to follow the principle “from simple to complex” when troubleshooting. That is, before disassembling half of the moped, you need to try to check everything that is easy and cheap to check.
First, remember what preceded the malfunction: some work may have been carried out or there may have been mechanical damage (for example, the moped fell). If something like this happened, start troubleshooting from there. There is a high probability that upon inspection you will find a broken wire, damaged insulation, a damaged connector, or something else.
Be sure to try cranking the engine with a kickstarter; it happens that the starter turns too slowly and there is no spark.
Alfa moped no spark
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- Publicado em 14 Out 2014
- After work we were going to go home, but my friend’s moped didn’t start. He unscrewed the spark plug, there was no spark, replaced it with another one, the same result. Since it was one o’clock in the morning, he pushed his moped to my garage, and I drove him home ( he lives in a neighboring village). In the morning I decided to see what the reason was. First, I checked all the contacts, then I rang the armor wire with a multimeter, then I changed the coil (I have it in stock). There was still no spark, then I changed the switch (I removed it from my moped) , but the spark never appeared. But when I checked, the current from the armored wire began to flow and I decided to try to install my own spark plug, as it turned out the whole problem was in the chip from the switch, the contacts went loose there, but when the spark disappeared, the owner changed the spark plug to a non-sparking one working. His second spare one was also not working. In the end, of course, I found a malfunction, but it could have been found faster. I concluded for myself that in any case it is necessary to check the functionality of the spark plug (even if they only installed another one before your eyes)) ), well, the owner didn’t draw any conclusions and I’m waiting for him again in my garage soon))). Naturally, not everything was included in the video, since it would have turned out to be a very long video, so I had to cut something out.
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Spark plug, high-voltage wire, tip
Next on the list is the spark plug. It happens that an apparently serviceable spark plug does not work, so it is better to immediately replace the spark plug with a known serviceable one. Even if the spark plug was in good working order, it’s okay, spark plugs are “consumables”.
Be sure to take a spark plug recommended by the moped manufacturer, or its complete analogue, selected from the catalog. Do not listen to “experts” who recommend non-standard spark plugs, for example, with an increased gap or three electrodes.
If the spark plug is working but there is no spark, check the tip of the spark plug and the high-voltage wire. There should be no mechanical damage or cracks on them.
Ignition coil
If everything looks intact, check the ignition coil. To do this, disconnect it (remembering how the wires are connected) and use a multimeter to check the resistance of the windings.
The primary winding is made of thicker copper wire. Its terminals are connected to two terminal connectors at the end of the coil. It has a small number of turns and therefore its resistance is low, approximately 0.5-5 Ohms. One wire of the coil is connected to ground - you need to check it, attach one multimeter probe to the nearest metal part of the moped, and the second to the coil connector. The resistance should be close to zero.
The high-voltage coil consists of several thousand turns of very thin copper wire, so its resistance should be on the order of 2-5 kOhms. The resistance must be measured between the coil contact connected to ground and the core of the high-voltage wire.
In this way, we will check the coil for a break, but without special equipment we cannot check for other coil faults, for example, an interturn short circuit, so we will leave the coil alone for now, also because a coil without visible mechanical damage is most likely working.
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After unscrewing the screws, remove the windings and sensor and inspect for damage.
You can measure the resistance of the components and compare it with the recommended one without removing the cover. Remember, as a rule, the control unit receives a signal both from the sensor and from its winding, distributed over the stator power windings. Therefore, it can operate regardless of the functionality of the main power system (the engine can be started even without a battery). After unscrewing the screws, remove the windings and sensor and inspect for damage. You can measure the resistance of the components and compare it with the recommended one without removing the cover. Remember, as a rule, the control unit receives a signal both from the sensor and from its winding, distributed over the stator power windings. Therefore, it can operate regardless of the functionality of the main power system (the engine can be started even without a battery).
Switch
To check the switch, we need a test lamp - this is a regular 12-volt light bulb with wires routed out for easy connection. A test light and connect one end to the ground wire, the other to the ignition coil wire. We turn the engine with the starter.
If the light comes on, the switch and its wiring are working properly. If the light does not light, then the switch or switch wiring is faulty. In order to be 100% sure that the problem is not with the switch, I recommend replacing it with a known good one. A switch for Chinese mopeds is inexpensive, if it suddenly turns out that the old switch is working, let it remain in “stock” until the next check.
Generator and ignition sensor
You can check the generator and sensor without removing them from the engine.
We switch the tester to the AC measurement mode for the 2V range or, if your tester has such an option, for 200mV. With one probe we touch any metal part of the scooter or engine, with the other probe we touch the sensor wire (in the picture above it is labeled as a Hall sensor, but in fact it is an inductive ignition sensor). We turn the engine with the starter and look at the multimeter display. If the numbers are flashing on the display, it means the sensor is generating a signal and everything is fine with it. Otherwise, the sensor is faulty or the wire is broken.
If you know easier ways to check or something is not described in sufficient detail, write in the comments. I will be glad to improve the article based on your feedback.
005_moto_1211_080
To check the spark, you can leave the original spark plug alone and use a spare one.
Otherwise, it is often inconvenient to unscrew it, and sand pours into the cylinders... To check the spark, you can not touch the original spark plug, using a spare one. Otherwise, it is often inconvenient to unscrew it, and sand pours into the cylinders...
The easiest way to do this is without even unscrewing the spark plug, but by using a spare one. Remove the cap from the spark plug in the cylinder, insert a proven working spark plug, turn on the ignition, and turn the shaft (using the starter or kick). It is best if the electrodes of the spark plug are in the shade, so the spark is better visible. If the spark is regular and blue, there is a good chance that the ignition is fine. It remains to make sure that the spark power is sufficient. To do this, insert an electrically conductive object (for example, a screwdriver) into the wire cap and secure its metal part at a distance of 6–8 mm from the “ground” of the motorcycle (cylinder head or engine crankcase). A powerful, regularly sparking spark with a click is a guarantee of the system’s serviceability. If the spark is yellow and jumps out irregularly, check the battery, wires, contacts again (including the breaker and capacitor - on older motorcycles that used a contact ignition system).
If this does not help, and also if there is no spark at all, you will have to look for the fault by replacing parts. The easiest way to start is with a coil and a high-voltage wire. First, let's check the resistance between the low-voltage terminals of the coil (the two “bolts” sticking out of it). It should be very small (from fractions of an ohm to units). Next, we check the resistance between the high-voltage terminal and any of the low-voltage terminals: there should be kilo-ohms there. If you have doubts about the high-voltage wire for testing, you can replace it with any one, as long as it does not pass closer than a couple of centimeters from other parts and wires. This is usually easy to do for a spark test. As a last resort, the ignition coil for checking a carburetor motorcycle can be taken from any similar (non-injection) 12-volt motorcycle or even from a classic Zhiguli.
Easier with multi-cylinder engines. Failure of two independent elements (individual coils or injectors) at once is practically impossible, so to troubleshoot, you can move parts from cylinder to cylinder. And as a last resort, get there on one (or three) by simply turning off the fuel supply to the cylinder without a spark (by unhooking the cable from the carburetor or the connector from the injector).
If replacing the coil, wires and spark plugs does not help, you will have to call a tow truck. It will not be possible to determine the malfunction of the pulse sensor or “brains” (engine control unit) with improvised means, much less repair them. And hardly anyone carries these parts with them (especially an expensive control unit). In addition, checking the pulses produced by the sensor should be carried out using an oscilloscope, since both the shape of the curve and the amplitude are visible on it. And there the signal phase and tenths of a volt play a role. We have already written in detail about the components of the injection system (see “Moto” No. 10–2010).
The photo shows an example of disassembling a generator to replace a faulty pulse sensor of a single-cylinder enduro. The work is not difficult, the sensor is cheap, but is not sold separately - only assembled with generator coils. And this is not cheap at all. Fortunately, there are now non-original kits and sensors on the market: you can try to find a replacement for the original one, preserving the “original” generator windings.
How to get to the generator winding and pulse sensor (using the example of a 1-cylinder enduro 250 cm³):
There is no spark on the moped - what to do?
Failure of a motorcycle ignition system can be caused by a variety of reasons, ranging from small and insignificant to serious ones requiring major repairs of the vehicle. Fortunately, bikes are technologically relatively simple (compared to cars) and you can fix the breakdown yourself. Very often, the reason for the incorrect operation of the ignition system is that there is simply no spark on the motorcycle. In this case, it is necessary to accurately identify the part or assembly that led to the breakdown.
- Spark Plug Inspection
If there is no spark on a moped or motorcycle, first of all, you need to check the serviceability of the spark plug . It should not be excessively dirty and be of a natural color. If the motorcycle owner has a 100% serviceable spark plug on hand, then test the operation of the ignition system with its help.
Design
The ignition system of the VAZ Oka consists of only seven main elements:
- Auxiliary relay;
- Egnition lock;
- Circuit breakers;
- Switch;
- Spark moment sensor;
- Coil;
- Candles;
All elements are connected to each other by wiring.
Using the ignition switch, the driver controls the power supply to the system from a source - the battery, while the voltage passes through the auxiliary relay and fuses. The lock has three positions - “0”, in which all electrical consumers are turned off, “1” - voltage is supplied to the ignition system and a number of other devices, and “2” - current is supplied to the starter. This switching sequence ensures that the ignition system is activated at the moment the engine starts.
We recommend reading:
Checklist for verification
Description of main connections
Have you read it? Write a comment
battery, spark plugs...everything is normal...but the scooter is a corpse. The starter does not work....what is the reason, can anyone give me any advice?
Riser - 125.....it doesn’t work anymore...just silence, everything is in order: spark plug, fuel, filter... what could it be?
guys, first of all, contact an electrician, I have the same problem, I changed the ignition coil, the commutator, basically wasted money, I called an electrician I know, he came and looked, he said that the hall sensor had burned out, I had to change the generator, after I changed it, a spark appeared . I bought the generator for 1000 rubles
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Comentários • 37
hello, I hope you can help me, I changed the central wiring on the alpha moped, I also changed the spark plug in the place with the armor wire and I have no sparks and the current doesn’t flow anywhere except from the ignition coil and that’s all what could be the reason
damn what to do please tell me I was riding an alpha 71kb moped and it started to stall and stalled and would not start again and I changed the spark plug and cleaned the corberator and it still did not start. And when you start it with your foot, sometimes it can shoot out of the pipe. Please tell me how to make a moped
Dmitry If the carburetor is in order and there is a spark, but the moped does not start, look at the valve head.
I can't start, can you help me?)
Why the hell are there extraneous sounds on the video, and so essentially nothing is said, so there are also extraneous sounds on the video.
Thank you very much helped
How much does armor wire cost?
help, I have no spark on my Verkhovina moped, what should I do?
Vitya Shapeev haha me too)
Hello everyone, take a look at my channel, I make different videos
Please give me some advice on why the Alpha moped does not have a spark, but it starts and there is a spark from the foot, the starter is spinning.
sprint 150cc spark not working
Where are you, I'll get you a motorcycle
Hello, how much does it cost to put a step on an Alfa moped?
Hello, I wanted to ask you, so I bought a 50 cc engine from an Alpha or Delta! And what do I need to buy to start it, what kind of wiring, so that it just starts from the kickstarter, basically from the stand!
Hello, I have such a problem. In the left cover, the coil was screwed onto 2 bolts, it turned out that 1 bolt was unscrewed and broke inside, there is a small hole on the magnet. I replaced the generator coil, ignition coil, and switch. Still no spark. Don't know what the problem is?
Denis, I have a spark, but it’s weak (it seems so to me). When starting with electric ignition, there is no such a confident sound (grinding), but a barely audible scrolling of the coil. What could this be?
Please tell me why there is no spark at the spark plug? I replaced the ignition coil, switch, and generator with new ones, still no =(.
I have the same problem((
Most likely the central wire (which fits the spark plug) needs to be replaced.
I have the same problem
Hello, I have a Trophy moped, such a problem happened when I turn on the turn signals they don’t blink and the dashboard doesn’t show that they are working either, what’s the matter, did I change the turn signals, maybe something wrong with the electronics?
+Denis Valerievich Thank you!
Most likely the turn signal relay has failed.
What about licenses for mopeds, are they already issued? Who knows what?
Andrey Samunin From the age of 16 you can take category A1 (up to 125 cubic meters) and category M (up to 50 cubic meters), and category A (No restrictions) from the age of 18.
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Do the spare parts from this site come normally and how long does it take to wait?
Hello, please tell me the website of the online store from which you order spare parts
+Denis Valerievich Thank you very much
Denis Valerievich, I didn’t drive all summer, because of a non-working spark plug, and as luck would have it, I bought new ones, but as it turned out, they weren’t working and they were fucked all summer, when it dawned on me to check the spark plugs themselves, they turned out to be pierced into the body, and there were NJK candles, although they weren’t expensive, I thought that this wouldn’t particularly affect their performance, but it turned out that it did.
+Denis Valerievich, apparently he didn’t know that it wasn’t working, so I already bought three candles and everything from one batch turned out to be bad, later I read similar cases with exactly the same candles that I bought. At first there was no spark at all on the new spark plug, after prolonged attempts to get a spark, it eventually made its way, and soon disappeared without a trace after a short period of work.
It happens that a spark plug and a new one don’t work; I’ve come across some of these. But there weren’t new ones in stock, and I don’t understand why I should carry a spark plug that doesn’t work with me)).
