A warm scooter engine does not start - the main reasons

Has anyone had this happen to them - the 2T scooter won’t start when it’s cold? I think many do. They often say: in the daytime it started with half a kick, but at night it stood - everything is useless, like dead, it doesn’t even grab.

There are several reasons, but the main one is a malfunction of the cold start system.

What kind of failures occur, how to identify and eliminate them?

Let's figure it out.

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Reasons why the scooter does not start when cold

:is::is::is::is: killed. I won’t say anything further. I’ll just ask a question - uncle, how old are you? and then what the HELL they say to check the compression not hot, not cold! and then when the engine is slightly warmed up. - I’ll answer.

It’s nice when the engine of a four-stroke scooter works “like a clock” and does not cause any trouble to its owner. But basically this only happens when the unit is warm. As soon as the two-wheeled “minibike” sits in the cold for a while, that’s it – there’s no way to start it when it’s cold. And you can't make it purr either from the starter or using the foot. So why does it happen that a four-stroke scooter does not start? The most common problems are in the ignition and fuel supply systems. More on this below.

Diagnosing a candle

The first step is to conduct a visual inspection of the spark plug. Unscrew it and look carefully to see if there are any mechanical damages or defects associated with melting. If any of this is present, then the spark plug should be replaced. In addition, moisture could get on it. To verify this, you need to remove the ignition element from the cap and let it dry. You can even do this over a gas one.

Quite often you can see cases when the owner is faced with the following problem: the scooter will not start. This may be due to a large number of reasons. Most often these are typical breakdowns or malfunctions, especially if the moped was parked in cold weather. Depending on the identified problem, the moped can be repaired in a few minutes or several hours.

Typical reasons

First of all, you need to check: the ignition and power systems. Carry out a check in those places that can cause the moped to move. The reasons why the scooter does not start, especially in cold weather, may be the following:

No spark in spark plug

The scooter does not start because there is no spark in the spark plug. In this case, you need to do the following: the spark plug is unscrewed and checked for suitability. Connects to the ignition coil using a wire.

Principle of operation

The reliability and simplicity of the design of this relatively cheap vehicle are so convenient for everyday use that the scooter has always been, is and will be popular among the people.
But even the most unpretentious equipment sooner or later begins to act up and let down its owners. And then one fine day you are faced with the fact that the scooter will not start. This may be due to careless handling, lack of timely technical inspection, as well as objective extraneous causes, consequences of an accident, and the like. Probable causes of breakdowns:

Possible reasons for engine silence may be the following:

1. battery discharge;
2. breakdown of the fuel distribution mechanism;
3. soot getting on the spark plug;
4. curvature and deformation of the belt in the motor design;
5. wear of the piston in the engine, wear of its components, etc.

Each of these reasons requires careful consideration in order to solve the problem. The scooter sometimes does not start due to a manufacturing defect.

Typical reasons

Starting a scooter in cold weather may not always be possible due to various factors. First of all, you shouldn’t torture the equipment if it doesn’t start right away. Check the following:

• Battery condition. If its charge is less than 12 A, the starter will not work. The normal voltage should be 14.5, this can be checked using a voltmeter. Try kickstarting the scooter.
• No spark. If the scooter was working fine, but then stopped starting, you should check to see if there is a spark. To do this, you need to pull out the spark plug and check its condition. The problem could also be with the coil or switch.
• The equipment may not be satisfied with the quality of gasoline.
• The malfunction may be hidden in the power system. If the scooter has trouble starting when cold, try adjusting the carburetor.

This is interesting: What do you need to know to extend the life of the braking system? (video)

Malfunctions in the power system

The power system may be to blame; If the piston group of the engine is working properly, then you should check whether gasoline enters the combustion chamber or not. This is easy to check: unscrew the spark plug and inspect it; if it is wet, it means gasoline is flowing. If it’s dry, we start checking with the gas tank: first, you need to find out if there is gasoline in there. If there is, check whether the tap is open. If everything is open, you need to remove the vacuum hose and clean it with air.

If everything is in order, move on to the carburetor float chamber. The bottom of the device is removed; it is usually held on by bolts. It contains a float. If the chamber is full, but gasoline does not flow to the cylinder, the nozzle is most likely clogged. You will need to pull out the needle, remove debris, dust, and all foreign particles. You can also check the scooter's petal valve: it is located below the carburetor. The petals may be damaged, causing the scooter to not start even if it is new. If the petals are not closed tightly enough, the valve must be replaced. In some cases, you can bend the petals with your fingers, but this measure will only help for a short time - only to start the scooter several times and ride it for parts.

In case of serious damage, you should check the piston, whether it gives the required compression ratio, the seals of the piston system, the CPG and the ignition system. But these reasons are more likely characteristic of old equipment that was not properly cared for.

No spark in spark plug

First of all, you should check the spark plugs if the moped does not want to start.

• The spark plug needs to be unscrewed. You can check it using a special device that is sold in car dealerships; it's inexpensive. You can inspect the candle visually. It should not be black or damaged.
• If the candle is wet, it needs to be dried. This should not be done with open fire.
• The candle may be stained with oil and carbon deposits may be visible on it. All this is cleaned with metal brushes, similar to toothbrushes.
• An easy way to check if there is a spark is by unscrewing the spark plug, putting the wire on it leading to the ignition coil and placing it on the cylinder. If you turn the starter, you will see a spark. If the spark plug is working but there is no spark, the problem is in the ignition coil.

Attention! The procedure must be carried out carefully, without touching the scooter frame or other metal objects with your bare hands, otherwise you will get an electric shock. If there is a spark and its color is yellow, then you need to install a new spark plug; yours is no longer suitable for use. A normal spark is blue and flows continuously

A normal spark is blue and flows continuously

If there is a spark and its color is yellow, then you need to install a new spark plug; yours is no longer suitable for use. A normal spark is blue and flows continuously.

If the coil is new, as are the spark plugs, but there is no spark, it is still worth checking the following:

• Oxidation of electrical wire contacts. They will need to be cleaned; for example, the wires going to the battery often become oxidized.
• No spark on the wire. This means that somewhere there is a bare wire that touches an ungrounded metal part, because of this the spark does not appear, since the current does not reach the coil. Check the wiring.
• The switch may also fail. This is an inexpensive item that it doesn’t hurt to always have in reserve.

Checking Basic Systems

In order to understand why the scooter does not start, the problem must be looked for sequentially:

• Start with the simplest thing - check the battery charge, if it is normal, proceed further.
• Check if the scooter has gas; it’s easy to forget to fill up.
• See if gasoline is flowing into the carburetor.
• Unscrew the spark plug, inspect it and check if there is a spark.
• If the spark plug is in order, check the coil in the manner described above, turning the starter with the spark plug removed.
• We check the coil and wiring with a multimeter, there may be a break.
• Clean the carburetor and adjust it correctly.

Supply system

After checking the electrics and making sure that everything is in order, you should get to the power system: if the fuel is supplied in the wrong amount, the scooter may not start. If there is a large amount of fuel, the carburetor overflows and the spark plug becomes wet, and if there is little fuel, there is not enough of it for the piston to move. To do this, you need to adjust the jet, floats and needle, moving the limiter on it. It wouldn't hurt to check the gasoline pump either: sometimes it simply fails, so the fuel doesn't go anywhere.

Ignition system

The entire ignition system must be checked if there was a spark and then disappeared. If the spark plug and coil are normal, but there is still no spark, you will have to check more thoroughly. The coil, generator winding, and switch come under suspicion. A multimeter can check all this: for example, they test a generator like this - one probe is connected to the engine crankcase, the second to the generator sensor.

How to fix a scooter

You will need

• — a set of open-end and ring wrenches, socket heads;
• - screwdrivers with flat and Phillips blades;
• - tester, insulating tape.

Instructions

If the engine does not start, check whether the ignition key is turned to the desired position and whether one of the brake levers is pressed. Check the serviceability of the brake light bulb or its electrical circuit. Look and replace if necessary the fuse in the main electric starter circuit. Check the terminals on the battery. Clean them from oxides, measure the battery voltage and charge if necessary. You can temporarily start the scooter using the kickstarter.

Check the serviceability of the electric starter circuit. Clean the contacts on the relay and starter, test the relay, starter windings and scooter wiring. If the kickstarter spins, check and replace defective kickstarter gears or ratchet gears. Unscrew the carburetor float chamber drain screw. If there is no gasoline in it, clean the gas tap filter and blow out the fuel line, check the serviceability of the gas tap itself and the tightness of the vacuum hose of its control. If the carburetor fuel valve is stuck, remove the float chamber cap and clean the valve seat. If this does not help, replace the valve. Unscrew the spark plug. If it is covered with a layer of unburned fuel, disassemble the carburetor, check the fuel level in the float chamber and clean the air filter. Check the serviceability of the automatic starter enricher and the spark at the spark plug. If it is missing, clean the spark plug electrodes with sandpaper or replace them. If this does not help, check the serviceability of other elements of the ignition system.

If the engine runs unstable, check the tightness of the carburetor inlet pipe and replace the gasket. Replace the crankshaft seals. By unscrewing the drain screw of the float chamber, get rid of the water in it. Blow out the carburetor jets and channels. Replace the gasoline in the tank. Remove the spark plug. If there is water on the insulator and electrodes, get rid of it in the carburetor float chamber by unscrewing the drain screw.

If there is black oily deposits on the insulator and electrodes of the spark plug, replace it with a similar one with a lower heat rating. Check and clean the vent hole in the fuel tank cap. Check the compression using a compression gauge. If it is not within specification, replace the piston, cylinder and piston rings. If there are oily marks on the head and cylinder, replace the gasket under the cylinder head or tighten the nuts securing it firmly and in the order recommended in the repair manual.

If there are extraneous sounds when the engine is running, adjust the thermal clearances in the valve drive of four-stroke engines. Check the tension and adjust the valve timing chain. Replace worn pulleys, rollers and other variator parts with new ones. If the engine stalls when the throttle valve is opened sharply, check whether the engine has warmed up sufficiently, check the carburetor adjustments and its main metering system, and the correct operation of the variator. If the engine does not pick up speed, smokes, consumes a lot of fuel, and a black coating has formed on the spark plug electrode, adjust the carburetor or install a smaller main fuel jet. If there is detonation and white deposits on the spark plug, also adjust the carburetor or install a larger main fuel jet. Also, check for clogged muffler, cylinder bores and ports. Clean them. If the muffler cannot be cleaned, replace it. If the engine begins to lose power while driving, check the fan blades and shrouds on the air-cooled engine. Replace damaged, broken or cracked ones. On a liquid-cooled engine, check for coolant leakage by checking its level in the reservoir. If necessary, replace the water pump, thermostat, radiator.

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The starting enrichment is faulty or does not work

The second reason is that the starting enricher does not work. For normal starting of the scooter engine when cold and stable operation at idle before it warms up, the carburetor must prepare a slightly enriched mixture compared to normal operation. The mixture is enriched by opening an additional fuel channel using an automatic starting enricher. In fact, the role of the starter booster is often underestimated by scooter riders and this point is overlooked. If there are no problems during a hot start, but during a cold start and stable operation after starting is difficult, the carburetor is still clean and the compression is normal - be sure to look at the starting enrichment. How to check it was described in detail in this article.

Why the Ural motorcycle does not start - compression problems

Most often, the compression on a Ural motorcycle is too low. It does not pump gasoline into the cylinder, so the mixture does not ignite. There are many reasons for leaks:

• — Air comes out through the valve.
• — Air escapes through the gasket.
• — The air escapes through the rings.

It passes through the gasket - pour water on the ribs and there will be bubbles there. In this case, simply replace the gaskets with Ural. If not, take a syringe of engine oil, pour it into the cylinder, using a special agent. We plug it with our finger. Has the compression improved? This means that the answer to the question of why the Ural motorcycle does not start well must be looked for in the rings.

If not, unscrew the lid, first placing a lining under it. Notice that the valve is tightened, because the rod is pushed out a little, and they are not level. The one that is higher is clamped. To adjust the gap, you need to relax the valves both right and left. Gently press the valve with your foot. The valves are relaxed.

Check the gaps with feeler gauges. Find 0.05 mm and insert where the rocker arm connects to the valve. If it doesn't hold, the gap is too big. Let's look at the next one. Unscrew the bolts and take the dipstick. We clamp it between the valve and the rocker arm and tighten it slightly so that it holds the dipstick. Fix the bolt and tighten the nut.

Troubleshooting

What to do if the hoverboard does not charge? Here are some simple tips for troubleshooting:

• First, disassemble the hoverboard.

To remove the bottom panel, use a screwdriver or screwdriver with the appropriate bit. This will allow you to get to the inside of the vehicle and try to find the problem of poor charging.

The side of the scooter with the charging port is the area you need to work on. Be careful during disassembly. Do not lose screws or washers, or use a drill to remove screws or bolts that will not come loose. There will be several wires directly on the inside of the plastic cover you just unscrewed.

They are responsible for charging the hoverboard: they connect the charger ports and the lithium-ion battery. The other wire line goes to the motherboard. You can temporarily disconnect it to avoid an unexpected power surge (only if the board is disconnected by a connector). If the wires are soldered, it is better not to touch them.

Is there blackening of the wire or oxidation of the contacts, is there a large amount of dust present? This may well be the reason for the device to not work correctly. Accumulations of dust must be removed, damaged wires must be replaced, and contacts must be cleaned to a metallic shine.

Having completed such an impromptu diagnosis, screw the cover back to the hoverboard, tightening all the removed bolts one by one.

They will help you make diagnostics more efficiently and without risk to the scooter. True, it is no longer free.

If, despite all this, your scooter continues to work incorrectly, you will need to contact the manufacturer and request repair instructions. In the worst case, the hoverboard will have to be sent back to the manufacturer under warranty. It may be that the device was initially faulty and will be replaced under warranty. It often happens that a newly purchased hoverboard does not charge.

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.

Causes of poor starting of a scooter engine

• Motorcycles
• Jawa Reviews/Tests
• IZH
• Minsk
• Ural/Dnepr
• Sunrise
• Scooters

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A cold scooter (moped) engine does not start - looking for the reason

The scooter does not start due to problems in the ignition system. To begin with, we unscrew the spark plug and examine the electrodes; if they are melted or have any defects, we replace the spark plug with a new one. If the spark plug is wet, be sure to remove it from the cap and dry it, for example, I do this on a gas stove. Now we insert it back into the cap and check for the presence of a spark. How to check for a spark on a scooter, the scooter will not start due to problems with the spark plugs. To do this, you need to attach the spark plug to an unpainted part of the engine, usually to the cylinder, and crank the crankshaft using an electric starter or kick. Before doing this, do not forget to turn on the ignition of the scooter. You should not check the spark with your bare hands; you should definitely protect yourself with special thick rubber gloves or a piece of rubber. Another point to consider is that the spark plug must be kept away from the spark plug hole in the cylinder head, since gasoline can splash out from there and ignite. In my practice, this has not happened, but the recommendations should not be neglected. When the crankshaft is turned sharply, a blue spark should run through the spark plug, quite powerful and constant. If there is no spark, or it is yellow and appears occasionally, first of all, we take it as faulty and check the spark in the same way on a new spark plug. As a rule, in more than half of the cases, at this stage the problem is solved and the scooter works properly

That is why it is so important to always have a working spare spark plug with you, which will always save you on the road in such a situation. If, after you have installed a new spark plug, the problem remains, we look further for a known faulty place: The scooter does not start due to a faulty spark plug cap or connection with it

It also happens that the cap may not be in sufficiently tight contact with the high-voltage wire. To exclude this from the possible causes of the malfunction, we must check it. Unscrew the cap from the wire and bring the wire 2-3 mm to the metal part of the engine

Please note that if, in the case of a spark plug, we pressed it against the engine, then in this case the specified distance must be maintained. Rotate the crankshaft and pay attention to the end of the wire, a spark should jump between it and the engine (do not forget that we are doing all this with the ignition on). If the spark appears, you can breathe a sigh of relief

We examine the spark plug cap, if it is wet (and often because of this the normal spark disappears), then we dry it with a hairdryer, replace the spark plug and check the spark. No changes? Then we replace the cap with a new one and go. Now consider the option in which there is no spark even on the wire. This phenomenon can happen with the so-called current leakage. The essence of this phenomenon is that any exposed section of the high-voltage wire touches the metal part of the scooter. This may not happen directly, and the role of a conductor can be played by water, which accumulates in the area of ​​the bare area when driving through puddles. Look carefully at the wire running from the spark plug to the ignition coil; if you do not find any places of disconnection or damage, then you can assume more serious breakdowns in the ignition system, namely: the ignition coil has failed; the ignition sensor (hall sensor) has failed; the switch is faulty; Any of these elements, if faulty, can cause a lack of spark or unstable operation of the scooter engine

You shouldn’t buy them right away; it’s important to determine which electrical appliance is faulty. To do this, for example, you can borrow exactly the same one from a friend to check

The scooter does not start due to problems in the power system.

Source

The scooter doesn't start well - what to do?

Sometimes a situation may arise that your scooter starts to have difficulty starting or stops doing so completely; this is definitely not a good situation, but it also has its own logical explanation.

In general, there are several solutions to problems with starting the engine on a scooter. To begin, make sure

Spark plug

that there is a spark and the spark plugs are working properly. To do this, you need to remove the cap from the spark plug and unscrew it with a special key. After you have done this, you need to put the cap back on it and, leaning it against a metal surface, in particular against the cylinder head, try to crank the engine, having first turned on the ignition, of course. If the engine starts to rev and you see a spark, then the spark plug is fine, but if there is no spark, then you need to look for the reason.

One of the reasons that the scooter will not start may be poor compression, which can be checked with a special compression meter. If the compression gauge shows below eight, then the piston rings will need to be replaced.

If there is a spark on the spark plugs, the piston rings are in order, but the scooter still does not start or does not start well, then the reason may be the fuel supply. The surest way to check whether fuel is supplied correctly and in the required volumes is this - you need to pour a certain amount of gasoline into the piston with a syringe through the hole for the spark plug and, screwing it back in, try to start, if it starts to seize, then the reason is in the supply there is still a combustible mixture. To solve this problem, you need to clean the jets in the carburetor and inspect the fuel pump and filter to see if they are clogged.

There are problems with many models today, not just certain ones. For example, if you have a Honda Dio that won’t start, then there is a solution to this problem. In general, many owners of such a scooter seek help with the problem of poor starting. But in fact, the solution to the problem is quite simple. In general, as in any internal combustion engine, there is nothing to burn for the engine itself to start operating, that is, you need to check both the presence of fuel and the possibility of its entering the cylinder, and there is nothing to ignite this fuel with, that is, there is no spark. As a result, problems are solved in exactly the same ways that are described just above. That is, if you do not have a spark, then you should check the spark plug cap, the high-voltage wire itself, the switch, and, of course, the spark plug.

At the same time, the problem may be that there are no necessary conditions for ignition of the combustible mixture in the combustion chamber. This could just be a failed piston system, which should provide the proper pressure in the combustion chamber. In such a situation, it is necessary to turn the engine starter for a long time in order to start and enrich the combustible mixture itself, which in turn increases fuel consumption.

Almost the same effect appears after wear of the crankshaft oil seals. At the same time, the engine, so to speak, “when cold,” may start perfectly, but after some time of operation, it may stall and begin to start poorly or stop doing so altogether.

Carburetor

It also happens that other factors are to blame for the cause of poor starting. For example, if your scooter also starts to smoke a lot, then you don’t need to worry about the oil pump. All you need to do is heat the exhaust pipe by disassembling it and throwing it into the fire. You will then see how much the mummy will burn out of it. After the smoke becomes noticeably less, you should cool it and shake out the carbon deposits from there, this can be done with an ordinary hammer, but you just shouldn’t be zealous, otherwise you can easily dent the muffler itself. As a result, the pipe should blow out easily, put it back and enjoy a smoke-free ride.

If the scooter does not start well and also smokes, you should inspect the piston system, and in particular the piston with rings. If they are too worn out, they should be replaced. In extreme cases, after checking the functionality of all components, you should think about a major overhaul of the engine.

Well, in conclusion, it is necessary to say about the oil that you use. By and large, almost all scooters smoke, especially when the engine is cold. At the same time, the oil, or rather its brand, allows it to “smoke differently.” If the speed is maintained normally on a “cold” engine and the scooter starts well, but on a “hot” engine the speed drops and it starts to start poorly, then there is a high probability of failure of the solenoid valve, which serves to facilitate starting the engine in not warm weather. That is, if it does not work properly and does not operate at the right time, then the speed will disappear when the engine is warm, and accordingly, increased “smoke” will appear while driving, because fuel consumption increases.

Thus, if your scooter shows any signs of malfunction, you can independently understand what the reason is and fix everything yourself.

Good luck in your work!

Discussion and assistance on problems with your scooters is provided in the comments below

All articles > Author: Ravil Salikhov

COMMENTS: (0)

Preliminary inspection of a motorcycle Minsk

Everyone understands that for stable operation of a motorcycle engine it is necessary that the required amount of fuel enters the cylinder. It is also required that there is a good spark at the spark plug contacts.

If the Minsk motorcycle does not start, this means that fuel is not entering the combustion chamber or there is no spark. You should not rush to unscrew the spark plug or remove the carburetor, but rather listen to the opinion of experts who recommend starting to eliminate this problem with a simple inspection.

When inspecting a Minsk motorcycle, you need to check the following:

• the presence of gasoline leaks on the hoses and the engine, after making sure that the gas tank tap is open;
• presence of parts of damaged motorcycle electrical wiring.

If an inspection of the motorcycle does not reveal possible causes of the malfunction, then you need to move on to the next step.

No spark

To check the spark, apply ground to the spark plug.

• - faulty spark plug,
• — breakage of the spark plug or armored wire, short circuit in the ignition coil,
• - there is no contact or the diode in the ignition switch with three wires on diode 34 is faulty,

• — the switch, generator or hall sensor is faulty.

All this is checked with a multimeter, or, in simple terms, a “tseshka”.

Electrics is a voluminous topic, so I will describe it in another article.

The scooter starts and immediately dies

Moderator: Alex174

Dongest » June 14, 2012, 00:18

Andrey8640 » June 15, 2012, 01:59

NordMoto » June 15, 2012, 08:17 pm

There can be a lot of reasons. Spark plug, carburetor, vacuum fuel valve, CPG, valves, etc.

You unscrew the spark plug and see it’s black, wet and covered in soot. We replace it with a new one. If you have a compression gauge, we plug it in and turn it with the starter, see if the CPG is alive or if the valves are holding. The problem is not resolved, let's move on. Carb problem. We check the integrity of the membrane and blow it out. (don’t forget that the CVK carb and all pipes must be intact). We check the electrovalve enricher.

Dinosaur » Jun 16, 2012 7:51 pm

Because a Jap is worth fixing and driving. And it’s easier to throw away a Chinese car with the first breakdown. Here is a quote from the owner of a Honda Lead 50. And the 90s have even more resources.

NordMoto » June 17, 2012, 00:38

Dinosaur » June 17, 2012, 01:08

I had a couple of Chinese. Now, if you'll excuse my French, I won't sit next to them to poop.

Honda had a tact - replaced the rings once and drove for five years without going anywhere beyond the filter. Lida is generally unkillable. The entire repair in three seasons was replacing the battery.

Cleaning and adjusting the carburetor

If you don't know why the scooter stalls when you give it gas, first check and adjust the carburetor. If it was often removed and adjusted, it may be that somewhere it began to leak air. If such a problem occurs, you can use a sealant or buy gaskets for the carburetor.

Let’s say the scooter stalls, you don’t know what to do. Then the first thing we do is clean the carburetor. Mostly the jets and auxiliary systems become clogged with dirt, so after cleaning the carburetor and adjusting all the jets, you can try to start the scooter again and give it gas. If the problem is not solved, move on to the main action - adjusting the needle to adjust the quality of the mixture. The needle in the carburetor performs the main task - adjusting the amount of fuel that is then supplied to the combustion chamber. Basically, you can adjust the quality of the mixture using a special jet on the carburetor, but if working with it does not produce results, you will have to manipulate the needle.

The needle is in close contact with the throttle handle, so when the handle is opened, the needle rises up and allows fuel to be supplied. That is, the higher the needle is raised, the more gasoline flows in and the power increases. Power guarantees better speed and traction. If you disassembled the carburetor, taking out the needle you will see 5 grooves on it, one of which has a retaining ring installed. Typically, such a ring is located in the center, that is, on the 3rd groove. If you lift the locking ring up, the needle will drop lower. This allows a leaner mixture to be supplied to the evaporation system, in which more air is supplied than gasoline. When installing the ring on the 4th and 5th grooves, the mixture becomes richer, where more gasoline is supplied than air.

Be careful that if you put the ring up or down as much as possible, this will not give the best result; the adjustment must be done gradually. Otherwise, the scooter will overheat, there will be a loss of power, and our main problem is that the scooter will stall when you press the gas handle. To find out the quality of the mixture, check the spark plug; its color will indicate whether the mixture is rich or lean.

Please note that there may also be other reasons why the scooter stalls when applying gas. Above we indicated the main ones; for some, the scooter stalls due to improper operation of the generator. Try, adjust, and share your problems and how to solve them.

Video

Structure and principle of operation

The cold start system works like a second mini-carburetor, in which the solenoid valve acts as a throttle. It is open only at start and gradually closes when the engine warms up.

The air mixture enrichment system consists of:

- additional channel,

— emulsion tube of the enricher,

- jet in the float chamber cover,

— solenoid valve.