Alfa moped won't start

Anyone who has purchased their first moped rarely thinks about the rules of its operation, maintenance and possible repairs. As a result, parts wear out faster, the moped constantly breaks down and works intermittently.

While the moped is relatively new, problems with the power unit and chassis system are almost invisible. But every day of driving a vehicle, with such an attitude towards it, adds to the likelihood that the moped will break down.

Unfortunately, it happens that young people, either due to lack of experience or because of their frivolity, do nothing if the vehicle is “jamming” and ride it until the moped stops starting.

Do you want to know why a Minsk motorcycle won’t start? All possible breakdowns.

Is there anything that can be done if the moped does not start from the starter? There are many reasons that lead to this. If the reason is serious, then it’s better to turn to experienced mechanics. Well, minor breakdowns are easy to fix yourself. Fortunately, mopeds produced in the USSR are distinguished by their simplicity of design, which also helps with tuning. For example, you can tune a moped yourself without any problems with a minimum of tools in the garage. Of course, you could use the help of an experienced mechanic, but for a novice motorbike enthusiast it is enough to be attentive and ingenious.

Correct operation of the moped

For proper operation of the fuel system of the Alpha moped, you should fill in A-92 gasoline.
You need to learn how to fill the tank correctly, remember that you cannot fill it to the brim. It is necessary to leave 5-7 centimeters from the neck. The first time you should change the oil is after the first thousand kilometers, if the moped was new, then after two thousand kilometers. A well-run-in engine works flawlessly, with a complete oil change, reaching five or even six thousand kilometers. If any questions arise regarding the operation of the Alpha moped, instructions will be provided to help the driver. It clearly presents information on the operation of a moped, contains answers to questions that periodically arise from the owner of the vehicle, provides many examples, and has clear illustrations.

As a rule, many minor problems can be fixed on your own. The instructions are transferred from the previous owner to the new one when buying or selling a moped. Plus, specialized stores always have a book on repairing motorcycles on sale. The book is also available on Internet resources

It is important not only to start a moped and ride it skillfully, but you should also respect other road users and during rides try not to mislead them with your dubious actions

What could cause

The reasons why mopeds no longer start may be the following:

fuel system
ignition system
compression
engine oil.

Each of these categories includes many details, which we will learn about below.

Fuel system

Nothing to burn, or lack of fuel in the combustion chamber, is the main reason why the moped will not start. Below are a number of common breakdowns and ways to fix them.

Low quality fuel. Diluted gasoline or old fuel will not allow the engine to start. A particularly pressing problem is when the delta or alpha does not start after winter. The fuel in the tank has lost its combustible properties and may not even ignite.
Faulty fuel valve. If fuel from the tank does not flow into the carburetor, the fault lies in the fuel tap. If you have a scooter, then immediately change the tap, first checking the presence of the supplied vacuum. You can try to clean the faucet on a moped.
A dirty fuel filter can prevent gasoline from entering the carburetor. The filter must be clean.
Carburetor. If the moped starts and stalls, there is an 80% chance that the cause is in the carburetor. To clean it, you can use a carburetor cleaner, but the safest thing to do is disassemble it and wash it yourself. The shut-off needle must be free of defects and the fuel jets must not be clogged!
A clogged air filter is another reason why the moped has difficulty starting. After all, for an engine to operate, it requires not only gasoline, but also air. Remove the air filter and try to see if the moped starts. If it starts, then the problem was in the air filter - clean it.

Advice! Only the serviceability of all components of the fuel system will ensure normal engine operation.

Ignition system

There is nothing to set fire to, or the lack of an ignition spark is the second most important reason when a moped has trouble starting

Pay special attention to the following details:

Candle. First of all, make sure there is a spark. Unscrew the spark plug, put the tip on, and then rotate the engine with the starter, pressing the electrodes of the spark plug against the metal of the engine. If there is a spark, it means that the entire ignition system is working properly. Otherwise, clean the spark plug, warm it up and try again. In case of failure, we look for a deeper reason.
High voltage wire. If the wire is exposed, at least in one place, it will pierce the body, and the spark plug will not work. Insulate the wire or replace it with a new one.
Ignition coil. If the coil does not work, there will be no spark. The ignition coil is checked using a multimeter. It is necessary to measure the resistance on the primary and secondary windings of the coil. The optimal resistance value can be found for each moped individually.

For example, the primary winding of the ignition coil (between the two coil contacts) of a Delta or Alpha moped should have a resistance in the range of 0.1 to 1.0 Ohms. The secondary winding (from the spark plug contact to the end of the wire) with a spark plug cap should resist with a force of 7-9 kOhms, without a cap - 3-4 kOhms.

If there is no resistance in the secondary winding, measure the resistance of the wire to ground. It should be within 2.5 kOhm.

Battery. The reason that a moped does not start when cold is often a discharged battery. To get a good push-button start, be sure to install a new battery in the scooter.

Compression

Motorcycles, scooters and mopeds start successfully from the stand only if there is sufficient compression. Compression above 7 kg per cm3 is considered sufficient. The optimal value is 10 atm.

You can measure the degree of compression with a compression meter. This device is inserted into the spark plug hole and then the motor rotates. The compressometer scale will show the exact value of the compression ratio.

Advice! To ensure that your Alpha starts like a clock, change the piston group parts on time, ensuring the necessary compression.

Engine oil

This reason can only be considered in the winter season. The engine oil may thicken and prevent the crankshaft from turning. In this case, you should warm up the engine crankcase with a heater so that the oil becomes less viscous and the shaft can rotate.

MY MOTORCYCLE

The moped stopped starting - what to do!? The answer is simple - we need to look for the reason. There is a small nuance and that’s it. I personally had this happen a couple of times with a scooter. It stalled and that was it, and due to my inexperience I didn’t know what to do. For the phone and call a familiar “uncle”, and the reason turned out to be simple. By the way, with Japanese mopeds there are a lot of very simple nuances, due to which it stops working, especially if it’s used.

What to do if the engine does not start?

The vital activity of the engine is supported by several systems, the main ones being:

1. Power system (gasoline). 2. Ignition system (spark). 3. Exhaust system.

If one of the systems is screwed up a little, then the engine can no longer work as expected. This means we need to check these systems one by one. So, the main types of faults that make the engine “dead”:

1. Too much/too little fuel mixture (power system) enters the combustion chamber. 2. There is no spark, too weak, or does not occur at the right time (ignition system). 3. It is difficult to remove, excuse me, gases (exhaust system).

The sequence of our actions when checking these systems without additional equipment will be as follows. Let's start with the ignition system. We unscrew the spark plug, place it on the cylinder and crank the engine crankshaft. Now we just need to determine if there is a spark. If there is no spark, the reasons may be the following:

1. The spark plug is faulty. 2. The spark plug cap is faulty. 3. The high voltage wire is damaged. 4. Break or inter-turn short circuit of the ignition coil. 5. Circuit breakage due to oxidation of wiring terminals or mechanical damage. 6. Faulty electronic ignition part.

We begin the test by replacing the spark plug with a known good one. Next we move on to the 5th point, it is quite possible that some connector has simply come loose. To check the serviceability of the spark plug cap, we simply exclude it from the system. We connect the spark plug directly to the core of the high-voltage wire. It is possible that you have already discovered a malfunction, and if not, then check the ignition coil. Almost any coil (from contact and electronic ignition) produces the voltage necessary for a spark if you sharply strike the positive wire from the on-board battery across the primary winding terminal on the ignition coil. If there is a spark, then all that remains is to check the electronic part of the ignition. Unfortunately, in garage and field conditions this can only be done by replacing the switch with one that is known to work. If there is still no spark, you will have to check the integrity of the coils on the generator.

If there is a spark, we proceed to checking the power system. If our spark plug is dry, it means there is not enough gasoline. If it is wet, there is an excess of gasoline in the fuel mixture.

Fuel system malfunctions:

1. Dirty or old gasoline, water has entered the gasoline. 2. The gas tap is faulty, the hole in the gas tank cap is clogged, and the fuel filter is clogged. 3. The carburetor is clogged or not adjusted. 4. Wet or torn air filter. 5. Damaged gaskets or carburetor pipe.

By the way, check the gas tank, otherwise the sensors on mopeds, if there are any, sometimes lie.

In the first case, we check whether the carburetor is clogged and whether gasoline is supplied to it from the gas tank. To make sure that the cause is a lack of fuel, pour a few drops of gasoline directly into the spark plug hole, screw the spark plug into place and try to start the engine. If everything is normal, then the engine should make several revolutions on its own. In this case, we check whether the gas filter is clogged, whether the gas tap or vacuum tap is working.

These actions must be performed with the air filter removed and the gas tank cap removed. There is an air hole in it, which can also become clogged. If the faucet is an ordinary mechanical one, then simply open it, remove the hose from the carburetor, and see if gasoline flows. If the valve is vacuum, we do everything the same, only we turn the engine with the starter. At the same time, a vacuum is created in the carburetor inlet pipe and the vacuum valve opens.

It also happens, on Japanese scooters, you just need to close the air filter with your hand and start the moped (this happened to me a couple of times). It's like it's breaking through.

If fuel flows into the carburetor quickly, then remove the carburetor, wash it, and set the standard settings for the quality of the fuel mixture. We do the same if the candle was wet because... in this case, either the quality of the mixture is not adjusted, or the shut-off valve in the float chamber does not work. This malfunction can occur due to contaminated fuel, so you will still have to flush the entire carburetor.

When the engine is flooded, you need to ventilate it by running it a little with the starter with the spark plug removed.

If the engine runs but does not develop full power, more serious diagnostics will be needed. Check to see if the carburetor is adjusted correctly. If the engine is four-stroke, we check the valve clearances; if it is a two-stroke, we check the reed valve. In any case, you will have to check the ignition timing with a strobe light. But sometimes, especially on used Japanese scooters with high mileage, the muffler is simply clogged. It’s impossible not to mention this because... The percentage of this malfunction is quite high.

"Delta" (V-50M) does not pull. / Help / MotoScoot - motorcycles and scooters

Such a thing, I took a Soviet Delta (used). I didn't go from the very beginning. The former owner said that he had just changed the rings and were getting used to them. I drove it around a bit, but it didn't get any better. When replacing the crankcase (the old one was cracked), I replaced the piston and rings with new ones (there was a small groove on the piston, apparently from a grain of sand; one ring was broken), it still doesn’t work. The clutch doesn’t slip, it just stalls on a flat road in first gear from lack of traction, it only goes uphill and then you have to push it with your feet.)) The carb (K60) has been adjusted. The only thing I don’t like is the jet, the hole in it is too large and somehow crooked.)) Does anyone have any ideas on how to make it go at least 40-50 km/h? PS I did not set the ignition (perhaps too early). Can anyone tell me how to do this correctly? It starts with just a click, the engine runs smoothly without load, and picks up speed well. When starting, when I slowly lower the kick starter, I hear some hissing, as if air is being sucked in. Is this how it should be or is there still a leak in the cylinder?

motoscoot.ru

First stage

The scooter that you decide to constantly use must undergo technical inspections to eliminate undesirable consequences during the period of active use. In this case, you should not save, since the driver’s health very often depends on the condition and quality of the vehicle.

To begin with, it is worth remembering that the vehicle’s maneuverability, controllability and predictability directly depend on the correct and high-quality technical condition of the moped. Before starting the journey, it is recommended to check the level of each fluid in the moped. Carefully monitor the amount of oil so as not to provoke the process of engine jamming. Start the scooter on a central support or stand - this will prevent incorrect and accidental movement while the engine is warming up.

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.

The second reason if there is no spark on the Alpha moped is the ignition coil, or switch

Checking the switch

The switch is in an accessible location. You just need to remove the right side decorative cover on the moped. Disconnect the switch from the wires and check with a multimeter. If such a device is not available, then we go to the store and buy a new switch. Fortunately, it costs a couple of hundred rubles.

Similar actions with the ignition coil.

Ignition coil (Bobbin)

Why the scooter does not start with the button - we identify the reasons

A scooter is a practical vehicle, economical and easy to drive. Modern models are reliable and easy to maintain, but various problems may arise during the operation of the scooter.

One of the most common breakdowns is the failure of the scooter to start with the button.

As a rule, at first the scooter starts from the button every other time, and then does not start at all using the electric starter. How to be in this case?

To fix a problem, you need to identify the cause of its occurrence. As practice shows, there can be many such reasons, but there are also quite common ones.

We list the most common reasons and give ways to solve them:

Fuel sensor malfunction. No matter how trivial it may sound, this happens quite often: the sensor shows that there is still gasoline left in the tank, and the owner of the scooter looks for the cause of the “breakdown” in a completely different place. Therefore, it would not be superfluous to first look into the gas tank and make sure that there is fuel in it. The battery is low. This often happens when equipment is idle for a long time. To solve the problem, just charge the battery. Old fuel. Many scooter owners face this problem after winter. There seems to be gasoline in the tank, the electric starter seems to be turning, but something is missing to start the engine itself. The cause of this problem may be old gasoline, try draining it and adding fresh fuel. There is no spark in the spark plug. To check this version, you need to unscrew the spark plug, apply it to an unpainted part of the engine (for example, to the cylinder), and use the kickstarter to crank the crankshaft

What to do if the scooter does not start when cold

Every scooter owner may encounter this problem: a pre-heated engine will work normally, but the scooter will not start in cold weather. Making a launch becomes extremely labor-intensive, or even impossible.

If the scooter doesn’t start well when cold, and you can’t do it with either the kickstarter or the electric starter, then it’s a consequence of problems with the power supply or ignition system. Each malfunction requires special attention, so we advise you to follow the instructions in this article.

Based on the identified problem, troubleshooting a scooter in cold weather takes from a few minutes to a couple of hours.

The moped does not start well when cold due to the lack of a spark in the spark plug. To resolve the problem, you must do the following:

you need to unscrew the spark plug and visually inspect it for damage, check the electrodes, if they are damaged, the spark plug needs to be replaced. If the spark plug gets wet, remove it from the cap and dry it, then close it back into the cap and watch for a spark. There are 5 possible states of the spark plug: good, wet, contaminated with soot, overheated, contaminated with oil;
connect it to the ignition coil using a wire and place it on the cylinder;
When rotating the crankshaft using an electric starter or kick starter, test the spark on the spark plug. Remember that you need to start the ignition on the moped and be careful when testing the spark, it is not recommended to do this with bare hands, protect yourself with rubber gloves;
during rapid cranking of the crankshaft, a continuous and strong blue spark should appear in the candle; if its color is yellow, or it appears very weakly and every once in a while, then replace the spark plug and test a new one;

Other possible reasons for the lack of spark after inspecting the spark plug

If your Alpha Moped does not start, find out the possible reasons and further steps to action.

Oxidation of contacts

The appearance of the spark plug may correspond to the norm, but the spark still does not appear, which means that a discharge test needs to be done. If there is no spark again, then test the scooter’s electronics for contact oxidation.

No spark on the wire

This may be a consequence of current leakage phenomenon. It is when a metal part of the moped comes into contact with an exposed high voltage wire. The conductor may have been water, which could have accumulated in the area of exposure during active trips through puddles.

You need to carefully inspect the wires running from the spark plug to the ignition coil, and if you do not find any disconnection or damage, then you can assume a critical breakdown in the ignition system:

damage to the ignition coil;
ignition sensor malfunction;
switch failure;

Each of these parts causes a lack of spark and intermittent operation of the engine, so before you buy anything, find out what exactly is wrong and try to borrow a working part to check from your friend.

For many motorcycles, a malfunction - the scooter does not start well - is detected and corrected immediately in the first stages and the engine starts properly, otherwise you should look for problems further.

Important! It is better to stay as far as possible from the spark plug hole at the top of the cylinder, because fuel may splash out and ignite from that place.

Effect of cold weather

The reason why the scooter does not start in cold weather may be a problem with the spark plug cap or its connector. In such a case, the cap is disconnected and the wire is brought a couple of millimeters closer to the metal element of the engine to rotate the crankshaft.

Vehicles in sub-zero temperatures are capable of passing current due to the contact of metal parts with exposed wires, as a result of which the scooter has difficulty starting in cold weather.

Failure in the power system

If you have already tested the occurrence of a spark and the performance of the ignition system, then the reason why the scooter does not start when cold may be hidden in a malfunction in the power system. This may mean either an excessive amount of gasoline supplied or a lack of it. The first thing you need to pay attention to is the following elements: fuel valve, gas tank, starting enrichment and gasoline pump.

Older models have a fuel tap directly under the gas tank. You need to disconnect the carburetor hose and open the tap, and then if the tank is completely full and gasoline flows out of the hose, then immediately begin inspecting the carburetor. If gasoline does not flow out, then the fault may be in the lines, or in the tap itself; you need to inspect them.

You might be interested in how to make an ATV with your own hands. A detailed description of creating off-road equipment from a motorcycle or car!

In new models, the fuel tap is automatic, operating due to vacuum. The fuel tank here is mounted above the carburetor, and the valve is a device consisting of a membrane, which often fails due to contamination and other things. This type of tap cannot be repaired and requires replacement.

To test the starter enricher, remove it and connect it to a 12v battery. Observe the needle; if it is working, it should smoothly exit the body; if this does not happen, it is faulty.

If all of the above elements are fully operational, proceed to disassembling the carburetor and cleaning it.

If you are experiencing difficulties with repairs, do not refuse the help of friends or contact technical service. It is better to entrust the matter to specialists than to buy unnecessary parts and spoil the existing ones.

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Alpha does not pump gasoline

03 Nov 2021, 06:42

Hello everyone. Guys, I have a real 50cc

Zs50f alpha. The problem is that gasoline does not pump from the tank. The essence of the problem. This has happened before, but somehow it was solved by itself. Here again this problem, there is a spark, there is light, I poured gasoline into the bottle, the tap was broken, I cleaned the carb and this problem remains. While in the air I put a drop of gasoline in it and it works fine, but there are failures in operation, I replaced the spark plug and it didn’t help. Then I adjusted the needle, it didn’t help, in a word, as long as you close the carb with your hand, it works fine, as soon as I threw my hand off the carb, the gasoline ran out and the moped stalls, but yesterday it erupted again, and it starts normally without closing the carb, but if the speed is below 5 k, then in order to increase the speed you need to give the gas very slowly, if you give it faster not very quickly, it will start to stall, I think I’ll look at the piston, maybe the pressure It’s weak and can’t pump. The ignition and valves are fine. But for some reason it doesn’t draw gasoline.

Re: Alpha does not pump gasoline

03 Nov 2021, 08:58

Re: Alpha does not pump gasoline

03 Nov 2021, 09:04

Re: Alpha does not pump gasoline

03 Nov 2021, 09:51

Re: Alpha does not pump gasoline

03 Nov 2021, 09:59

Re: Alpha does not pump gasoline

03 Nov 2021, 10:05

Why would she be wet?

Clean the gas valve by unscrewing it from the tank. Controlling the air blowing. Check the gas hose by blowing air. Collect and check the leakage of gasoline from the gas hose. Assemble the hose and try to start it. If it doesn’t help, remove the carburetor and figure it out.1. The shut-off needle for supplying gasoline to the float chamber 2 is stuck. Some hole and/or jet is clogged.

Business for 20 minutes leisurely with a smoke break and coffee.

Source

Popping sounds in the exhaust pipe of a scooter - the main reasons

By popping noises in the exhaust pipe of a scooter, we mean any extraneous sounds that can be heard from the muffler while the scooter engine is running, when starting or stopping the engine. Popping sounds can be frequent or occur very rarely. Be that as it may, this is a malfunction that needs to be fixed.

Why does the scooter muffler shoot?

There may be several reasons why we hear popping noises in the exhaust pipe of a scooter.

Most often, this happens due to the fault of the spark plug, namely due to the periodic lack of a spark. The essence of this process is that the required volume of the fuel mixture does not ignite at a certain point in time within the operating cycle and the fuel mixture goes into the exhaust pipe.

This happens periodically, so at the moment of the normal power stroke, when the mixture in the cylinder ignites and the hot gas is discharged into the muffler, the mixture present there also ignites. At the same time, we can hear both a quiet clap and a rather loud one.

What to do if you hear popping noises and shots from the muffler of a scooter

Of course, the exhaust system of a scooter is not designed for such a cycle, so this phenomenon negatively affects both the muffler and the operation of the engine as a whole. What to do if you hear popping noises in the muffler.

We already know that the spark plug is mainly to blame, so we need to unscrew it, clean it, adjust it and evaluate its suitability for working on the scooter engine in the future. Also, there must be a known working spark plug, preferably a new one.

Replace the old candle, check its operation, if the popping continues, it’s time to throw it away. Install a new one and check again; most likely, the problem will already be solved at this stage.

Other causes of pops and shots in the muffler of a scooter

But sometimes you can find other causes of popping noises in the exhaust pipe.

In some cases, the culprit is an enriched mixture. This could happen due to dirt getting into the carburetor or incorrect settings, so you need to make sure that the carburetor is adjusted and clean.

We have already looked at how to clean a scooter carburetor.
You can see how to properly adjust the carburetor here.

Be sure to check if the starter enricher is working. A faulty starter enricher can cause the scooter's fuel-air mixture to become significantly richer.

In older models of mopeds, where ignition timing could be adjusted, popping noises in the exhaust system were observed when the ignition timing was late.

Modern scooter models do not have this drawback, so the likelihood of a malfunction occurring due to late ignition is negligible.

You can also read other articles on the topic:

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.

Checking the presence of a spark and the condition of the spark plug

This is the simplest check that every moped owner can carry out, having only a spark plug wrench or a spare spark plug on hand. Moreover, if you unscrew the spark plug from the engine, you can at the same time assess its condition and understand by the color of the carbon deposits how correct the working mixture is being prepared by the carburetor.

So, if you unscrew the spark plug from the engine, pay attention to the carbon deposits that cover the central electrode. The carbon deposits should be brown or light brown in color. If the carbon deposits are black, this indicates that the mixture is too rich, or the spark plug is faulty, or the engine is “eating” oil. Perhaps this is the reason for poor engine performance.

Also pay attention to the presence of liquid on the candle. If the spark plug is “wet”, that is, there is gasoline on the spark plug, then gasoline still enters the combustion chamber, but does not ignite. There are at least three reasons why a spark plug may be wet:

trying to start the engine with the ignition turned off - if you turn the engine with the kick starter for a long time, the spark plug will simply flood with fuel and it will not be able to work normally. To solve the problem, the candle needs to be dried, for example, heated with a lighter.
The spark plug is faulty - if the spark plug insulation is broken or the gap is broken, the spark plug will not work normally. Only replacing the spark plug with a known good one will help here.
ignition system faulty

Now we put the tip on the spark plug and press it to a metal surface, for example, to the engine head, turn on the ignition and turn the engine with the kickstarter. It is more convenient to check the spark together, so that one person holds the spark plug and the other turns the engine. But in principle, one person can handle it. Be careful - there is high voltage at the center electrode of the spark plug.

If there is no spark, then the ignition system is at fault. Check all wires for breaks or shorts to ground. All electrical wiring connectors must be connected. If possible, replace the ignition coil with a known good one. Check if the generator coils are damaged. You can read more in the article “The moped has lost its spark, what should I do?”

If you can’t figure out the wiring, contact someone who knows how to do it.

If there is a spark, then most likely the problem is in the power system. Screw the candle into place and continue.

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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Second phase

Knowledge about braking will help preserve your health while moving. How to drive a moped? Learn thoughtfully and at the moment when the situation on the road requires it. Braking may not seem like a difficult task, but even a small mistake can cause serious injury and danger to others.

To avoid unpleasant incidents, follow certain points:

Start the braking process in advance, when you have calculated the end point of your stop.
Use not only the rear brake, but also the front brake.
There is no need to perform sharp braking, as this creates a danger for other active road users.
Constantly monitor the technical condition of the entire brake system. Wet or faulty pads can interfere with braking performance.
Consider weather conditions - they affect the braking distance, as well as the full effectiveness of the braking system.
Remember that on poor quality road surfaces it becomes much more difficult to calculate the trajectory and the braking distance itself. Therefore, be careful when you see changes in the asphalt or other road surface along your immediate route of travel.

If simple rules are not followed, a moped can easily hit curbs, collide with other vehicles or pedestrians. Sometimes dangerous skidding occurs and even the driver falls. When your successful movement is over, it is recommended to turn off the engine

Pay attention to the future parking space. Professionals do not advise leaving your scooter on slopes or on poor road surfaces.

A helmet for cycling is not required, but is advisable.

According to the traffic rules of the Russian Federation, a helmet is required only for moped drivers. But traffic police inspectors, when issuing licenses to schoolchildren, check for the presence of a helmet. The exam is accepted only if it is available.

They also warn parents about the responsibility of children riding without helmets and the risk of serious injury. A helmet protects the bicycle driver during impacts and falls. It reduces the likelihood of traumatic brain injury by 63-88%.

A child can ride a bicycle on the roads from the age of 14, but a license is required and protective equipment is desirable: a helmet and special glasses. If you explain all the dangers of Russian roads, you can easily convince your child to use what is necessary.

Checking the engine power system

First of all, you need to make sure that there is enough gasoline in the gas tank. There is a small tube inside the gas tank that takes gasoline not from the bottom of the gas tank, but a little higher. Therefore, it may turn out that there is still gasoline in the tank, but it does not flow into the carburetor. Therefore, if possible, add gasoline to at least half the tank and try to start the moped again. Perhaps this is the reason.

You also need to know that the gas tap of the Alpha moped has two positions: in one, it takes gasoline closer to the bottom of the gas tank, and in the other, a little higher. If you don’t know in which position the gas tap is open, try installing it in a different position, maybe this will help.

It is very convenient to check the gasoline supply if you have a transparent tube from the gas tank to the carburetor, or have a replaceable gas filter installed. In this case, you can immediately see whether there is gasoline or not.

There is also another simple check of the power system: take a small amount (5-10 ml) of gasoline into a syringe, remove the air intake tube from the carburetor and pour gasoline directly into the carburetor. If after this the moped starts up, or as they say “catch,” then the reason is definitely in the gasoline supply and you need to check the fuel supply and carburetor.

If after all the described checks the problem is not found, there is one more check left - checking the engine compression.

Checking the ignition timing

If there is a spark, fuel is supplied, compression is fine, but the moped still does not start - the ignition timing may be off.

On 139fmb engines, which are installed on alpha, the ignition timing is not adjustable. It is rigidly determined by the position of the flywheel on the crankshaft. The engine crankshaft on the generator side has a conical surface on which the flywheel (also known as the generator rotor) is tightly seated. The correct position of the flywheel is set using a key that is inserted into the crankshaft keyway.

You can check this visually (remove the generator cover, unscrew the nut securing the flywheel and see if the grooves match). But the groove on the crankshaft cannot always be seen (depending on the specific instance), so there is a more reliable way: buy or borrow a strobe light from someone (many car repair shops have one), unscrew the plug on the generator cover and check that flashes occur at the same time the label || appears in the window.

Why is there no spark?

The second most common problem is why a scooter won’t start - there is nothing to ignite the fuel, or there is a spark - but there is nothing to ignite. To check the spark, you need to remove the spark plug cap and unscrew the spark plug. It must be dry and clean. The gap between the electrodes is needed 0.6-0.7 mm. The first sign of a lack of spark is that the spark plug is wet and smells of gasoline. This means the fuel did not burn in the cylinder and remained on the spark plug. Dry and clean it, then insert it into the cap and lean it against the cylinder mass.

At the same time, press the starter button for a second or the kick starter a couple of times. The spark between the spark plug electrodes should be clearly visible. If there is no spark, then replace the spark plug with a new one, most often this is the problem.

The quality of gasoline in Russia is not very good, this quickly kills spark plugs, especially iridium ones. If a spark does not appear with the new spark plug, we look for a fault in the wiring. A broken wire or oxidation connecting the ground between the frame and the engine is a common problem. Another reason could be a burnt-out resistor in the spark plug cap. It can be checked with a multimeter; the resistance should be about 5 kOhm. If this is not the problem, then check the ignition coil, this can also be done with a multimeter. In this case, the resistance of the primary and secondary windings is checked. The resistance of the primary winding, as a rule, tends to zero. Well, the resistance of the secondary should be several kOhms. There shouldn't be a break.

It is also worth checking the switch by replacing it with a known good one.

The next possible malfunction is a break in the wire coming from the ignition switch or the wire coming from the switch. Check the wires for breaks or abrasions. Check the reliability of the female-male plug connections. If no visible damage is found, a wire break can be detected by testing each wire with a multimeter. If the above manipulations did not produce results and a spark never appeared, the last reason for its absence is failure of the generator, pulse sensor or generator windings, which happens extremely rarely. The generator windings can also be checked with a multimeter.

Carburetor clogged

The symptoms of the problem are the same as in the previous case - you can start the moped, but then it stalls. That is, there is a spark, there is gasoline, but the moped does not start. In order to check whether the carburetor has broken down, you need to check how gasoline flows from it into the cylinder.

Take the spark plugs and wet their contacts with gasoline. Then screw the spark plug being tested into the cylinder and try to start the moped. If the bike starts this way, it means the carburetor will have to be repaired.

If you are on the road and need to quickly get to your destination, you can clean the supply hoses by blowing them with a pump. If this does not work, then you need to completely clean the carburetor.

Alpha moped will not start: causes of breakdowns and diagnostics

Most Chinese mopeds are produced using the same technology; the models differ only in technical characteristics, such as power, design and additional equipment. It will not be difficult to find a breakdown in a moped, because the design of different models differs little from each other. Troubles can happen to different models, the Alpha moped is no exception; to save your budget you can find the fault yourself. Next, we’ll look in more detail at why the Alpha moped won’t start and what malfunctions there may be.

Popular causes of moped malfunction.

Almost all experienced moped owners know that there are two main malfunctions due to which the moped stops starting: ignition and problems with fuel supply. There are a number of other, more serious breakdowns that you cannot fix on your own, but in this case we will focus on these most common breakdowns.

Diagnostics of candles.

The spark plugs in the Alpha moped are standard, and the spark supply is also no different from other models. To check the spark plug for malfunctions, you first need to carry out a little diagnostics. The first step is to exclude all kinds of mechanical damage; perhaps something damaged the spark plug while driving, in which case there will be no full spark.

Another common reason why a moped will not start is heavy carbon deposits on the spark plugs, so if there are no visible defects or damage, the spark plug may need to be cleaned. You can remove accumulated carbon deposits with regular sandpaper; after these simple manipulations, the moped should start.

You can also test the operation of the spark plug by trying to start the moped from the foot; if there is no spark, then the cause of the breakdown is something else. Very often, Chinese mopeds are equipped with low-quality ignition coils; they fail very quickly.

Compression.

Alpha has good compression, which can be checked by simply placing your finger in place of the spark plug. When the moped starts, powerful pressure is generated, the finger will be pushed out under pressure, but if not, then the cause of the malfunction may be in the engine or piston parts.

It is necessary to carefully check the piston; it must be firmly fixed to ensure full compression. You can also check all the gaskets; perhaps the cylinder is leaking, which is why it is leaking air and the pressure drops.

Carburetor malfunctions.

A fairly common breakdown is a carburetor malfunction. The carburetor ensures fuel circulation; if there is a malfunction, the fuel simply will not circulate normally, and without fuel, not a single moped will work.

To troubleshoot problems, sometimes it is enough to simply clean the carburetor of dirt; often debris and other third-party substances get into it, interfering with normal operation. You can safely wash the carburetor of the Alpha moped with plain water and dry it well; if this was the cause of the malfunction, then the moped will start soon.

The Alpha moped is not the worst option for Chinese-made mopeds; most often it starts with a half-turn and, if used correctly, works for many years. Sometimes it is enough to carry out a little maintenance or simply recharge the battery to get the moped to start. If the preventive maintenance carried out does not produce results, it is worth taking the moped for diagnostics; no one is immune from problems with the engine.

A professional will probably find out the cause and eliminate it; there is no point in trying to check the engine yourself, so as not to completely ruin it. Any equipment will last longer if you regularly carry out diagnostics and monitor its condition.

Source

Alfa moped won't start

Battery

If your Alpha moped is well preserved, most likely you know how to start it from the starter. But if you are faced with the impossibility of doing this, and there is no desire to start the Alpha moped from the foot, repairing the electric starter is quite simple. Usually the problem begins precisely because of a dead battery; it is enough to charge it and recheck its functionality.

Reasons for lack of spark

Often, owners may encounter cases of starting failure in the cold season, although the moped drove well in the autumn. Initially, you need to unscrew the spark plug and carefully inspect for spark, oiliness and color.

Carbon deposits on the electrode

There may be no spark, if the electrode is covered with carbon deposits, then they are cleaned with a metal brush. If there is even the slightest doubt about the serviceability of the spark plug, you should replace it immediately, thereby making your life easier in the future.

Acidification of contacts

If the external signs of the spark plug correspond to suitability, and there is also no spark, then you need to check whether there is a discharge. It is worth noting that you need to be extremely careful, as it can give you an electric shock. If there is no spark and the external signs of the spark plug are normal, then the scooter is checked electronically for acidification of the contacts.

Insufficient fuel

If there is a spark, but the moped still has difficulty starting from the starter in cold weather, you should pay attention to the fuel tank. If it is empty then it is filled

It is worth noting why old gasoline pours out of the carburetor float chamber. How to do it? There is a bolt at the bottom of the carburetor; it is unscrewed, and after all the fuel has flowed out, it is screwed back in. Before putting the moped in the garage in cold weather, fill the tank full of fuel.

Unscrew the bolt and pour out the old gasoline from the carburetor float chamber

If the above has been checked and done, and the scooter does not start well from the starter, then you can make the following repairs:

The carburetor is removed and the air filter is cleaned;
The carburetor is cleaned, the jets and channels are purged;
Everything is coming back together.

Electrical problems

There is only one symptom of a wiring problem - the moped will not start from the starter. To check that this is not possible, you need to turn on the rotation in “ON” mode. The rotation does not work - something happened to the wiring.

To fix the problem, you need to look at the battery terminals to find out if the wires themselves are damaged. If everything is fine with the wires and terminals, then the problem is insufficient battery charge. In order for the battery to work, its charge must reach 13 volts.

When the charge is not much less (about 9-12 volts), try starting the moped from the kickstarter, so you can ride the bike for about fifty kilometers. If everything is fine with the battery, but the moped still won’t start, you need to contact a service station, because you won’t be able to do it yourself.