Old motorcycles and mopeds were always started with a kickstarter (foot). Smart people thought of installing an electric starter on modern mopeds and scooters, and now you can start by pressing a button on the steering wheel - very convenient! However, you may be unexpectedly upset by the fact that the scooter does not start from the starter and then you have to start it with your foot the old fashioned way. Let's find out about the reasons for this phenomenon and find solutions.
What to do if the scooter does not start from the starter
Old motorcycles and mopeds were always started with a kickstarter (foot). Smart people thought of installing an electric starter on modern mopeds and scooters, and now you can start by pressing a button on the steering wheel - very convenient! However, you may be unexpectedly upset by the fact that the scooter does not start from the starter and then you have to start it with your foot the old fashioned way. Let's find out about the reasons for this phenomenon and find solutions.
Principle of operation
Inside the body there is a movable cylindrical element called a rotor (in collective farm language - an anchor). An insulated copper wire is wound on the rotor in a strictly defined order, forming several independent coils, circuits, windings, poles, circuits - which, in fact, is the same thing. The ends of each of the coils have their own independent outputs in the form of lamellas (contacts) on the collector.
Inside the main body, two permanent magnets are glued exactly around the rotor. Each of the magnets has a different pole N (north) S (south) in relation to each other. Anyone who went to school will understand...
After you press the start button, the electric current from the battery will begin to pass through the power terminal, the brush and then, passing through the lamellas of one and the rotor windings - it forms a constant magnetic field along the axis of the armature.
I think there is no need to explain that the magnetic field that forms a constant electric current has different polarities? So, what am I talking about?.. Oh yes, the magnetic field of the rotor will begin to interact with the magnetic field of the permanent magnets and the armature will deviate by a certain degree. The commutator will turn, the next pair of lamellas will approach the brushes and the rotor will deviate again. Thus, it will rotate exactly until you lower the start button.
Possible faults
Someone may think that there are 159 reasons, and it is unrealistic to do everything yourself. However, repairs and diagnostics can be done independently. The reasons why a scooter does not start can be divided into several categories:
- Ignition problems
- Fuel problems
- Starter problems
- Problems with the electrical circuit.
To fully check the moped, you should carry out a comprehensive diagnosis, checking each of these categories in turn.
Fuel problems
In this category, several parts may be faulty. The most common breakdowns are a failure of the fuel tap, a clogged air filter or carburetor.
Remember! If the scooter starts easily from the foot, then this step can be skipped. Go straight to electrical faults.
Fuel tap
This element of the power system can have two malfunctions: fuel does not flow, or gasoline flows continuously. The fuel tap can be diagnosed very simply:
- Remove the fuel supply hose from the carburetor and the vacuum hose from the cylinder head cover. Pull air into yourself through the vacuum hose with your mouth, thereby forcibly creating a vacuum. Gasoline should flow from the supply hose. If this does not happen, the fuel valve should be replaced.
- If fuel flows continuously from the supply hose, the valve should be replaced immediately.
- If fuel flows with difficulty, then replace the fuel filter or clean the vacuum valve.
Carburetor and air filter
These two elements are related. Try starting the scooter without an air filter. If successful, then change the filter. As for the carburetor, it must be cleaned periodically. Especially considering the quality of gasoline at gas stations.
You can check whether fuel is supplied to the cylinder by unscrewing the spark plug and assessing its condition. A wet spark plug indicates problems with overflow or a malfunction of the ignition system. Close the spark plug hole with your finger and turn the engine shaft using the kick starter. If the fuel supply is correct, traces of gasoline will remain on your finger.
Ignition problems
This category is also typical if a 4t or 2t scooter does not start at all. Lack of spark will not allow the engine to start. It is necessary to check for the presence of a spark at the spark plug. Unscrew it, insert it into the cap and bring it to the cylinder. When the engine rotates, a spark should jump between the electrodes. If it is not there, clean the spark plug from carbon deposits, set the required gap or change it.
Starter problems
If the scooter does not start from the starter, then there is a high probability of a malfunction in the scooter itself. Before removing the starter, you should make sure that the required voltage is supplied to it. This will be easy to do with a multimeter:
- Set the device to DC measurement mode.
- Connect the multimeter leads to the starter housing and the positive wire.
- Press the engine start button.
- A voltage of 12V should appear.
- If voltage does not appear, then the problem should first of all be looked for in the electrical circuit (wires going to the starter).
Remember! Before such diagnostics, be sure to make sure that the battery is charged. The voltage on it must be at least 12V! This is a prerequisite for your Yamaha, for example, to start from the starter.
If voltage appears at the starter, but it does not turn, then the problem is there. Remove it by unscrewing the two mounting bolts and disconnecting the positive wire. Disassemble and inspect it for traces of burning. Assess the condition of the brushes and replace them if necessary. You may even have to replace the starter if the winding is damaged.
Before repairing the starter, be sure to disconnect the negative terminal from the battery or remove it altogether!
Electrical circuit (wiring)
The answer to the question why the scooter does not start may lie in the electrical circuit. If voltage is supplied to the starter, less than 12V or not supplied at all, then the engine does not start.
Sequence of repair actions
The main rule for detecting malfunctions and repairing a scooter is to step-by-step eliminate the elements of the system when identifying the causes of a breakdown in any of them. Search and repair, especially when starting from the starter, must be done in accordance with a strict sequence, where the chain may act as the beginning, and the end, for example, if there is or is no spark. It is worth noting that you do not need to immediately run for a new switch for the scooter, first make sure that the generator is functioning perfectly, only after that test the wiring if there is no spark, etc.
Checking Basic Systems
It is important to remember that gasoline has the ability to lose its properties if it sits in cold weather and may not even ignite. Also, before making a final diagnosis and starting to repair the moped, if it does not start from the starter, you need to make sure that the spark plug can do its job and the carburetor is functioning normally.
Remember that the scooter starts from the starter when it has an integral part with proper operation of the variator, clutch, camshaft group and valve. To put it simply, if all power systems are in normal condition, then there is a problem in the transmission, thanks to the crankshaft torque, which works closely with the variator.
In the process of diagnosing and repairing a scooter, in some cases it is necessary to do a thorough check of not only individual elements, but also the entire system. For example, if there is debris in the carburetor, provided that it is intact and the air filter is saturated, the presence of dirt in the cavity of the gas tank and the fuel filter is also carefully examined.
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Comments 14
The compression is rather weak, so it won't start from the starter. Change the rings. I started it from a car battery because the piston was heating up, I jerked it off for so long that the cylinder got hot. On the Chinese, this kind of crap happens even when replacing the rings, until they rub it in, it won’t start from the starter.
Thank you. I'll take into account the lapping of the rings. otherwise, out of ignorance, I would have rushed into panic)))
Well, this doesn’t always happen; it depends on the wear of the cylinder; maybe everything will be fine right away.
I’ll add my 5 kopecks))). my wife doesn’t start when cold, the starter turns normally, but it doesn’t start at all. With a kick it starts normally. Once it warms up and reluctantly starts from the starter, I’m inclined to replace the piston rings. Maybe someone can also do something useful will tell you
Gee, that was such bullshit! Does the starter turn the engine in the right direction? Otherwise, if the brushes are not placed correctly, it turns the knee in the opposite direction and does not start.
No, that one. After a long time of fucking the car battery started up
This means a voltage drop. They are sensitive to this.
change the scooter. buy stealth or sum, Japanese ones are also in the subject. but in fact the starter on them let’s just say so. It doesn't have enough rpm power. if you install boost dc-dc/ then it will start. or with a screwdriver, an 18-volt battery is a proven option.
What we have is what we have. Everything is fine on the paw
From the claw, the engine simply turns at higher speeds than from the starter, so from the claw and starting there may not be enough compression. Is the scooter two-stroke or four-stroke? Four - supported intake valve. The two-piston has lifted, you can remove the plug and have a look.
4x. How to unlock it?
Everything is simple there. Remove the cover from the cylinder head with 4 bolts, you don’t even need to remove the cooling casing, install the camshaft sprocket so that the two small holes are parallel to the plane of the head, and the large hole is on top and check the gap between the rocker arm and the valve, you can do it without feeler gauge, just pull, there should be a gap, if there is none, adjust the valves. It’s just that with four-stroke Chinese, during operation, over time, the valve sits deeper in the seat and the gap between the valve and the rocker goes away, if no one has adjusted the valve since the purchase, it is 100% that the valve will be tightened.
I think it's a matter of contacts. Masse. Clean, lubricate, tighten. Maybe the contact in the starter is acting up.
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 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?
Rules for operating a moped
The service life of a moped depends on maintenance. Care comes down to following the rules recommended by the manufacturer.
The main ones include:
- Testing a new scooter. The first concerns the running-in of a new scooter. The scooter must not be overloaded for the first 1000 km. When driving for a long time, you must stop every 30 minutes to prevent the engine from overheating.
- Correct use in winter. You need to drain the fuel before storing the scooter in the garage for the winter. Remaining fuel can destroy the tank and flood the carburetor. If you plan to use the scooter in winter, you need to change the fuel, check the battery charge, oil level, condition of the filters and tire pressure (it should be about 1.5 atmospheres).
- Correct use in summer. In hot weather, it is important to prevent the scooter from overheating. When driving for a long time at 30 degrees, the cylinders will be constantly overheated. This could cause the belt to break or the engine to break down. You should also not squeeze the throttle for too long, and when stopping, immediately turn off the engine.
- Use quality fuel. Gasoline must be at least 92. On a new moped, you need to change the oil for the first time after a run of 500 km. Subsequent replacement will be required every 1000 km. The first time to change the oil in the rear gearbox is after 200 km, then every 5000 km.
- Replacing the variator belt. This part is considered a consumable item, as it wears out quickly due to the high power load. If the moped stops squeezing out high speed, then the part and its components need to be replaced.
- Carburetor maintenance. The procedure includes a visual inspection for leaks and gasoline consumption levels, checking the condition of the connecting elements and the serviceability of the unit elements.
- Filtration quality control. The filter must be replaced promptly and impregnated with a special product after installation. This is necessary for high-quality air purification. Dirty air reduces the life of the motor.
Sources:
https://neknopka.ru/%D0%BF%D0%BE%D1%87%D0%B5%D0%BC%D1%83-%D1%81%D0%BA%D1%83%D1%82% D0%B5%D1%80-%D0%BD%D0%B5-%D0%B7%D0%B0%D0%B2%D0%BE%D0%B4%D0%B8%D1%82%D1%81% D1%8F-%D1%81-%D0%BA%D0%BD%D0%BE%D0%BF%D0%BA%D0%B8/ https://omopede.ru/remont/skuter-ne-zavoditsja. html https://proscootera.ru/masterskaya/ekspluatatsiya/skuter-ne-zavoditsya-so-startera https://topkarting.ru/chto-delat-esli-skuter-ne-zavoditsja-so-startera.html
If the scooter starts with the kickstarter, but does not start with the button
If the scooter starts without problems from the “leg”, but does not want to start from the electric start button, then you should pay attention to the central fuse (it is located in the compartment with the battery). If the voltage in the scooter’s electrical network is too low due to a faulty fuse, it will no longer start using the “Start” button.
To check the serviceability of the central fuse, you should measure the voltage at the battery terminals and compare with the voltage after the fuse.
If losses are detected during measurements, the fuse should be replaced. In most cases, after replacing the faulty fuse, the scooter starts without problems.
The problem when the starter button on a scooter does not work may not only be in the fuse. It is likely that the integrity of the connecting conductors in the engine starting circuit is broken.
VIDEO INSTRUCTIONS ” alt=””> It will be difficult for a beginner to deal with such a malfunction, so for a complete diagnosis of the electrical circuit it is better to contact an auto electrician.
Main breakdowns and methods for solving them
On scooters, the electric starter often fails. Of course, Kickstarter can help out, but it’s not very convenient to use. The engine may not start due to a faulty battery: the contacts have come loose, the charge has run out, the device is worn out. If there is no spinning sound when the starter turns on, then the problem is in the battery. If you can’t charge it, it means it’s out of order, worn out and you’ll have to install a new one.
If pressing “Start” does not produce a click in the electric starter relay, the problem is more serious. The unit may be faulty and needs to be replaced. The problem can arise when various components wear out. Most often they need to be replaced.
You can fix some scooter problems yourself
Electric starter does not work
If the scooter does not start from the foot, then its operation is impaired. If the electrical circuit is working properly, but the relay clicks when you press “Start,” then the problem is a bad contact or a broken starter.
To evaluate its performance, you need to apply voltage to it without activating the relay. If the electric starter does not turn, then it needs to be replaced.
Starter relay failure
The relay maintains the voltage at the required level for further distribution to headlights, dashboard indicators and other elements. Its durability depends on the battery. If the voltage in the generator increases or decreases, the relay is faulty. Because of this, the starter does not start. In this case, the relay needs to be replaced.
Problems with the button
When the Start button is pressed, the starter rotates and drives the engine gears. If the scooter does not start with the electric starter button, there is a malfunction. The wiring in the engine starting system could have come loose. If the scooter starts from the foot, but not from the “Start” button, then the fuse is faulty: the voltage in the generator drops, so the button does not work.
To check the functionality of the fuse, you need to measure the voltage at the battery terminals and in the fuse. If losses are detected, a new fuse must be installed. After replacing the part, the moped will start from the “Start” button.
If the scooter breaks down, the electric starter may not work.
Broken brake contact (toad)
The brake system needs regular inspections, as driving safety depends on it. A breakdown of any other scooter system is easy to identify, since engine operation is disrupted. Brake failure can only be detected by diagnosing the vehicle. During the inspection, you need to check the integrity of all parts and the amount of brake fluid.
Replacing brake fluid is necessary every 8-11 months, depending on the intensity of use. In this case, you need to use the liquid recommended by the manufacturer. If the brake pads are worn down by 2 mm, they need to be replaced. Hoses need to be replaced if there are cracks or abrasions.
If system parts are worn out, brake contact is lost. Because of this, the engine will not start.
Contacts have come loose or oxidized
If the scooter does not start, the reason may be the contacts with the battery. It is necessary to check if they are charged. This must be done carefully to avoid electric shock. If there is no spark, you need to check the electronics. Most often the reason is oxidation of the terminals. When they become coated, the scooter does not start moving from the starter. You can clean the contacts with sandpaper or gasoline.
Contacts with the battery may be the reason if the scooter does not start
Bendix doesn't work
The starter fails due to careless handling of the bendix - the starter wire that engages with the engine flywheel and powers it. When the engine starts, a special mechanism with a relay pulls the bendix into the starter, stopping the engagement. Inexperienced drivers most often encounter Bendix breakdowns.
The secret to reassembling
To avoid the long and tedious hassle of installing the rotor into the housing, secure the brushes from moving out in their sockets with toothpicks, lubricate the rotor axles with some refractory grease, install the rotor in the housing and remove the toothpicks. This will make it much easier and faster, and most importantly, you won’t break or twist anything.
And one more thing: if after assembly the starter rotates in the other direction, do the following: unscrew the bolts holding the housing together and rotate the housing with magnets 180 degrees relative to the second half of the housing and the problem will go away.
How to check, replace
Checking is carried out using a multimeter. This device is used in electromechanics and is sold in hardware stores. There are models without a sound signal - they do not differ in appearance, and therefore you have to ask the sellers. Without a sound signal or “ringing” it is inconvenient to constantly look at the panel, but it is possible to carry out the check. Sequentially, starting from the battery to the ignition circuit and generator, all the wiring of the Alpha moped is checked. The multimeter has two probes: red and black. Red ones need to touch the plus, and black ones need to touch the mass or ground.
READ How to connect contacts on your phone
Thus, the wiring of the Alpha moped is a complex and vulnerable place for this vehicle. However, this is exactly what will help toughen the motorcycle owner in the face of eternal breakdowns and make him a real ace in the electricity of his motorcycle.
Any scooter, be it Japanese or Chinese, has the ability to start from an electric starter or a kick starter. If the first one doesn’t work for you, which is a very common problem, kickstarter comes to the rescue. Let's look at the reasons for its breakdowns.
Alpha does not pump gasoline
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
Insufficient fuel
Fuel may not flow due to a jammed carburetor shut-off needle. This is possible when it is clogged, or because the level in the float chamber is out of whack. It is necessary to disassemble the carburetor, blow out all channels and jets with compressed air. You can use a bicycle pump for this. After cleaning, check that the float and the rubber seal on the shut-off needle are intact, and adjust the floats. The position of the floats must be horizontal. Otherwise, by bending the tongue under the locking needle, achieve a horizontal position of the floats on the inverted carburetor. After putting it back together, use a transparent hose to accurately check the fuel level. You can use the VAZ washer hose. by connecting it to the carburetor sump and unscrewing the drain screw, the fuel level should be level with the joint of the bottom cover +/- 2mm as in the figure below:
By the way, if the scooter does not start in the cold, in the morning, or in the fall, then the solenoid enrichment valve is most likely faulty.
Cleaning the collector
We place the rotor on some clean surface, preferably wooden, and use any suitable needle to clean out the dirt between the collector lamellas.
After cleaning, take a piece of some lint-free cloth, thoroughly moisten it in clean gasoline, wrap it around the commutator and begin to rotate the rotor commutator in it. It is not necessary to rub the collector much; it will be enough just to wash it from dirt to approximately the same condition as in the photo.
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.
The spark plug is not working properly
The moped will not start if the spark plugs are faulty. To diagnose this, you need to check the spark plug and the area under it. The place under the candle should be completely dry. A wet spark plug means there is too much gasoline in the fuel mixture. If something is wrong, the area under the candle needs to be wiped dry.
Very often, starting the engine is prevented by carbon deposits on the spark plug, which prevents it from producing a spark. Using a spark plug, you need to unscrew the spark plug and check it. It's very simple. To check if the spark plug will work, you need to put a cap on it and touch its bottom to the frame of the bike.
Then you need to try to start the bike using the kickstarter. If there is no spark, it means that the contacts in the spark plug cap are not functioning. Then the contacts are “pressed”. And if a spark does not appear even after this, the spark plug needs to be changed.
