The scooter will not start when cold, what should I do?

Greetings to all scooter riders!

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.

The motor belt is damaged

The scooter does not start - there is a spark, there is gas, but there is no reaction.
Another source of the problem may lie in a deformed belt in the motor design. This technical element makes a huge number of revolutions during the day. It is located on the same side as the kick starter, under the motor cover. The belt itself is a consumable, replaceable element of scooters, so sooner or later it will need to be replaced. It cannot be restored; all you have to do is buy a new one at a motorcycle parts store. When purchasing this spare part, it is recommended to pay attention to the overall diameter of the belt and the thickness of the rubber layer - they must correspond to the model of the scooter and its configuration. Otherwise it will not work on your moped

What to do if the scooter does not start? Tips from the master

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. Placed on the cylinder. When the crankshaft rotates, the spark at the spark plug is checked. The scooter will not start if there is no spark at the plug, or there is a spark, but it is inconsistent.

Reasons for the lack of spark on the spark plug

Cold weather

The scooter may have difficulty starting in cold weather if there is a problem with the spark plug cap or its connector. In such a situation, the cap is unscrewed from the wire, and the wire is brought 0.3 cm closer to the metal motor element to crank the crankshaft.

Ignition system

If the scooter does not start well when cold, then you need to check the spark plug . We check the electrodes; if there are defects, then the spark plug is damaged and needs to be replaced. If the spark plug is wet, then of course you need to dry it and check if there is a spark. If there is NO spark, then you need to check where and what can eat it.

Since the spark plug is normal but there is still no spark, you need to check the spark plug cap and connections to it. First, check that the cap has contact with the high-voltage wire. To do this, you need to unscrew the cap and bring it to the engine (no closer than 2 mm), or rather to its metal part. Twist the crankshaft and see if there is a charge between the cap and the part where we lifted it. If the charge starts, then the problem is in the cap. Check it for defects and moisture. If you can’t make it, then simply replace it with a new one and the problem is solved. If there is NO charge, then you need to check where the charge can go. It could be water or an exposed piece of wire touching a metal part into which a charge is transferred.

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.

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

You can often encounter a situation where a warm scooter engine works fine, but when it’s cold, problems arise and starting it becomes extremely difficult, and in some cases, impossible. However, you will not be able to start the scooter using either an electric starter or a kickstarter.

In this case, the problem usually lies in the ignition system or in the power system. Both breakdowns require serious attention and adherence to clear instructions, which I will describe below.

Since most often the problem lies in the ignition system, we will consider this point in more detail. After that, let's move on to the power system.

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 candle is wet, be sure to remove it from the cap and dry it, for example, I do this on a gas stove. Now insert it back into the cap and check for 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 place a spark plug on an unpainted part of the engine, usually 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, as gasoline may splash out from there and ignite. This has not happened in my practice, but the recommendations should not be neglected.

When the crankshaft is cranked 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 installed a new spark plug, the problem remains, we look for a known faulty place further:

The scooter will not start due to a faulty spark plug cap or connection to 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. We 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.

Crank 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 do all this with the ignition on). If a 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 occur due to 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 that accumulates in the area of the bare area when driving through puddles.

Examine carefully the wire running from the spark plug to the ignition coil; if you do not find any disconnections or damage, then you can assume more serious damage to the ignition system, namely:

the ignition coil has failed;
the ignition sensor (hall sensor) has failed;
the switch is faulty;

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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 for testing.

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

You should pay attention to this point first of all if you have a spark on your scooter and there are no problems in the ignition system.

Difficulty starting the engine, if considered only within the framework of the power system, will arise either from a lack of fuel or from its excess.

On older mopeds, such as “Karpaty” and others, the fuel tap is installed immediately at the bottom of the tank. Disconnect the hose from the carburetor and open the tap; if gasoline begins to flow out of the hose, skip this step and turn all your attention to the carburetor. If gasoline does not flow, although there is some in the tank, then the problem is either in the tap itself or in the line, we’ll take a look and see.

Modern scooters and mopeds have an automatic fuel tap, which operates due to vacuum. A striking example of such scooters are Yamaha and Suzuki equipment, as well as similar Chinese scooters. Here the gas tank is installed above the carburetor, and the role of the tap is performed by a small membrane-based device. Sometimes it is this membrane that can fail due to contamination and other factors. This type of fuel tap cannot be repaired, and if it fails, it must be replaced.

On Honda scooters, generally, the gas tank is located below the carburetor, and fuel is supplied to it by a fuel pump. In this case, of course, the above fuel taps are absent, since they are simply not necessary. It is very simple to check the operation of the fuel pump, disconnect the gasoline supply hose to the carburetor and pump the crankshaft with a kick or electric starter, the gas pump should produce fuel and gasoline will begin to pour out of the hose.

Since we are considering problems with starting the engine of a scooter and moped “in the cold”, and the starting enrichment is responsible for this start, you should definitely check it too. To briefly describe the operation of the enricher, the essence is that a cold engine requires more fuel to start and operate stable. This is precisely the function that the starting enrichment performs. A special needle opens an additional channel and slightly more fuel enters the carburetor than usual. Initially, the needle is in the retracted position. Inside the starting enricher there is a heat element, which, when heated, pushes out the needle and closes the channel.

If the starting enrichment is faulty, then enough fuel for normal starting does not flow into the carburetor, and of course starting problems arise. To check the enricher, remove it and connect it to a 12V voltage; after some time, the needle should smoothly come out of the body a few millimeters; if this does not happen, it is faulty.

If all the channels are clean and there are no problems in the fuel tap, as well as in the fuel pump and enricher, we proceed to disassembling the carburetor and thoroughly washing it. How to do this has already been described in previous articles.

It should be noted that difficulties with starting a cold engine also arise when the piston is worn out, so in this case it would be a good idea to check the compression, especially if your scooter or moped has traveled more than one thousand kilometers.

If you have difficulty starting the engine, and all the above remedies did not help you, ask a question in the comments field, and we will try to solve the problem together. Good luck with the repair.

You can also read other articles on the topic:

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.

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.

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.

Typical reasons

No spark in spark plug

Hard to start in cold weather

This problem happens quite often. Many scooter riders do not pay serious attention to it while the scooter can still start . But when it comes to the point that the battery is completely discharged during the process of starting the equipment, they begin to scratch their heads.

First, try starting the scooter several times so that each time the pump pumps fuel completely. Turn the key, wait 5-7 seconds and then start. Do this several times, if it doesn’t work, look for the reason.

The main problems why a scooter starts poorly when cold is in the ignition system and power system. It also happens through air leaks. Let's take a closer look.

Why does the scooter stall at idle?

A scooter, like any piece of equipment, can break down over time. Therefore, it needs to be checked and maintained from time to time. If the scooter is not serviced in a timely manner, it will therefore not serve you for a long time and faithfully. Even Chinese devices serve faithfully in capable hands. Today we will talk on the topic: “Why does the scooter stall at idle.”

Scooter stalls at idle

It happens that the scooter works well and picks up speed without problems. But if you release the throttle, the scooter will go into idle mode and stall. Most often this happens when it has not yet warmed up and without accelerating it stalls. But it happens that this happens after warming up or driving for a long time. What to do in such cases? Why does my scooter stall at idle? If it has not yet been run-in, then most likely you should just finish it and everything will work out. But if this is not related to the running-in, then we are looking for the reason.

Stalls at idle: reasons

The reason that the scooter stalls at idle may be a lean mixture (or a breakdown in the fuel system) or bad gasoline. Before starting repairs, check the quality of gasoline. If this starts after refueling, then you need to drain the gasoline and refuel at a proven gas station (you can rinse the tank with acetone). If this does not help, then you need to check the enricher itself and the mixture enrichment channels. If there are no problems there and the scooter stalls at idle, then we move on. We check the entire fuel system: - Carburetor. We remove and disassemble it. We completely wash every part and every channel. We put it back together in the same order as we took it apart. — Air filter. The paper one needs to be blown out with a compressor. If the condition is completely bad, then you need to replace the filter. We wash it with gasoline and dry it a little. Then soak it in oil. Squeeze out any excess glass in your hand. — Vacuum valve. Remove both hoses from the carburetor. We take the thin one into our mouth and suck it into ourselves. This is done to create a vacuum. At this time, gasoline should actively flow out from the other hose. If gasoline flows out sluggishly, you need to remove the vacuum seal and rinse, blow out, and clean it. After this, warm up the scooter well and adjust the idle speed.

If the scooter continues to stall at idle, then the possible reasons are: - The electric enrichment unit is jammed or incorrectly installed - The jets or the enrichment channel are poorly washed - The air filter is not sufficiently saturated or not saturated at all. — The carburetor is in poor condition. To check, you can tighten the quality screw completely and unscrew it one turn. This will be a very rough setting that will need to be reconfigured, but now you can check it will fix the scooter stalling at idle.

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Messages [1 to 20 of 34]

1↑ Topic from Uralchik 09/27/2014 18:27:13

Uralchik
Newbie
Inactive

Registered: 01-06-2014
Posts: 22

Topic: It's corny, but Ural won't start

Guys, the story is this: I started it, rode about 500 meters and the motorcycle stopped pulling itself (in a straight line), started shooting and sneezing. Well, you understand. Immediately thinking - sucking air. And sure enough, oil was oozing under the left cylinder head. There was an aluminum gasket, I replaced it with a paronite gasket. I set the valve clearances “by eye”, first setting them to TDC (arrow on the flywheel) and adjusting the left one, and then turning the right cylinder back to TDC. I haven’t come across tuning on two-cylinder ones, so I asked my friends how it was done, and then began to demonstrate. It seems that everything is set as before (the gaps feel the same), but the bastard won’t start! Once it grabbed once, roared at high speeds (for some reason, at high speeds) for about five seconds and died. It never started again, didn't even catch. The spark is excellent on both spark plugs, I didn’t touch the carburetors and ignition, as before the breakdown they were still standing, but before the breakdown the engine was flying, not driving

Tell me where to start poking around to understand what's going on?

Oh, I almost forgot to clarify, the battery is fresh, just from charging, unless the motorcycle was parked in the open air, where did the water get in?

Edited by Uralchik (27-09-2014 18:28:06)

2↑ Reply from RaaF37rus 09/27/2014 19:22:37

RaaF37rus
Pro
Inactive
Name: Sergey

From: Ivanovo region. Kamenka village
Registered: 07/27/2013
Posts: 568
Reputation: 66
Motorcycle: IMZ 8-103-10

Re: It’s corny, but the Ural won’t start

Well, it’s better to set the valves not according to the mark on the flywheel, but “when the intake starts to close, you adjust the exhaust, and when the exhaust starts to open, you adjust the intake.” Couldn’t you turn the camshaft? look.

3↑ Reply from Lerych 09/27/2014 19:47:12

lerich
MotoDealer
Inactive
Name: Valery

From: Yaroslavl region
Registered: 01/18/2012
Posts: 2,138
Reputation: 215
Motorcycle: Ural m66, Riga 22, Java 360, Ural 8.103

Re: It’s corny, but the Ural won’t start

so there could be a bunch of reasons. I didn’t touch the carburetors, but gasoline may not flow. from the same tank for example. I have about the same crap. it started and worked well, and then suddenly it won’t pull after 5 km. I took the carbs apart and gasped! there the dampers are not just worn out, but they are even chewed up, just on the cylinder, which barely plows. The tank was so clogged that I had to pierce the nipples that connect the compartments with a nail. The ignition tends to unscrew. The camshaft support has the same property, but the marks no longer match and the valve timing shifts. The valves are somehow strangely adjusted. As I understand it, if you set it according to the mark, then one cylinder and the second should be set at 180 degrees, and not according to the mark. Otherwise, all strokes will occur on both cylinders at the same moment, and this should not be the case.

From: Permyak
Registered: 05/16/2012
Posts: 6,924
Reputation: 618
Motorcycle: Dnepr MT 10-36, Ural M 67

If the moped is not

Sometimes it happens that the moped does not want to start after several hours of inactivity. However, after warming up, it works and starts stably. Let's figure out why this happens.

When the engine is cold, all clearances (in the piston, in the valves, etc.) are far from ideal. Plus, when fuel gets on cold engine parts, it evaporates worse and therefore ignites worse. Because of this, during a cold start the engine needs a richer mixture than usual. It is for this purpose that devices are made on carburetor engines to enrich the mixture at start-up.

On the Alpha moped (and similar ones), an air damper is installed. It reduces the air flow and thereby enriches the working mixture. The damper has two positions: “closed” - the lever is raised up, “open” - the lever is lowered down. When starting “on a cold” air damper must be closed (lift the lever up). When the engine runs for a while with the throttle closed, it needs to be opened. Driving with the throttle closed will lead to increased fuel consumption and the formation of carbon deposits on the spark plug and piston.

What to do if a cold moped does not start even with the throttle closed? Try using a syringe to fill in 5-7 ml. gasoline directly into the carburetor inlet pipe. If the moped starts after this, then the carburetor needs to be adjusted. If it doesn’t start, check the spark and compression (see above).

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.

The resistance of a working sensor is 500 Ohms. If the value is higher, the winding is faulty; if it is below 200 Ohms, the problem is in the coil.

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.

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.

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.

Supply system

If everything is fine with the ignition system and there is a spark, then the reason that the scooter does not start well when cold is in the power system. Thus, the problem is either a lack of fuel or an excess of it. We check the gasoline pump and starting enrichment . If there is something wrong with them, the fuel will flow uncontrollably. Perhaps there is none at all; there is little of it. Or vice versa - a lot. The reason why the scooter does not start well when cold may be that dirt has gotten into the carburetor . The carburetor needs to be cleaned. Also, the scooter may have difficulty starting when cold if the piston . This is possible if you have already traveled several thousand km.

Greetings to all scooter riders!

Has anyone ever 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.

Why does a spark plug fill on a scooter and how to fix it

Experienced motorcyclists have faced the problem many times: the spark plugs are filled with fuel! This article is intended for those who have encountered such difficulties for the first time. Together we will find out the cause of this unpleasant phenomenon, and also figure out ways to fix the problem and methods to prevent the candles from flooding again.

Causes of malfunction

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

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

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

This is what a lit candle usually looks like

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

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

We are trying to start the engine

So, we figured out why the spark plug on the scooter floods. The repair methods and starting methods below apply to scooters with 2T and 4T engines.

The method is suitable if there is no tool. If you flooded the spark plug while trying to start the scooter, then give it time to stand for about 5 minutes. Then turn the gas handle all the way and turn the engine with the starter for about 10 seconds. You can use the foot several times if the starter is faulty. Release the throttle and try to start the engine again - it should work.
If you have a spark plug wrench, you should unscrew the spark plug and warm it up over a fire, after cleaning it from carbon deposits. With the spark plug removed, you should “blow out” the cylinder by rotating the engine with the starter or foot. Screw in the spark plug and try to start. If unsuccessful, the spark plugs should be replaced. This is how you can heat a candle using a gas burner.

Advice! Although the first method is faster, it is still recommended to use the second. This cleaning of the ignition system will help avoid such problems for some time.

How to start a scooter after winter?

After a long period of inactivity in a cool room, equipment may not always start as well. Therefore, owners often have the following question: how to start a scooter after winter so that it starts working immediately? In practice, a large number of methods have emerged that allow this to be done quickly and easily. Let’s make a reservation right away - if preliminary preparation took place before preservation, the 4-stroke engine will start instantly.

Accumulator battery

Never turn the starter with the battery until the crankshaft completely stops turning. When the power unit refuses to start instantly, there is no need to try to turn the starter again “waiting for a miracle,” since the charge in the batteries will still come in handy.

For trouble-free starting, you should only use a battery that is in good technical condition. A battery lit through wires may give good results, but it will not provide a reliable start, as when using a battery prepared in advance for a scooter. If the battery has suffered from self-discharge, it will not only not be able to crank the engine, but will also not be able to provide the required voltage to the “brains” (if they are present).

Candle

If the battery is really in good condition, but the Chinese scooter cannot start, you should unscrew the installed spark plug and check its condition. If it is not wet, the fuel is most likely causing the problem.

What should a spark plug look like during normal wear?

Before screwing the spark plug back into the engine, you need to check the spark. To do this, insert it into the cap and create contact with ground (frame or engine block) by sharply cranking the crankshaft. You can also use an alternative option in the form of holding the cap with your hand, but it is best for these purposes to use a piece of wire, one end of which is screwed to the power unit block, and the other is brought out to the spark plug thread. If there is no spark, you will have to change it. But if it is present, install it back and try again to resume the operation of the four-stroke engine.

Petrol

If the spark plug remains dry, make sure there is fuel in the carburetor. Due to constant temperature changes, the tank may suffer from condensation. Since a lot of it accumulates after a long winter, starting the scooter will be very problematic. Some models have a special “appendix” that allows you to get rid of liquid, but if the tank is always in its place and no one has drained the water, after some time there will always be water in the fuel system.

Try replacing the fuel and starting the power unit this way. Most likely, after a comprehensive cleaning, your 4-stroke engine will again show signs of life.

Application of ether

To start the motor with it, you should spray a certain amount of ether onto the filter part, and then close the lid. Everything should be done as quickly as possible so that the ether does not evaporate during this time. If the engine still fails to start after three or four times, you will have to go to a service center for help. If you find that the motor has been able to “sneeze” several times, try to do the same thing again.

Engine starting ether is sold in aerosol cans

If in the fall the scooter did not cause any problems with starting, but after hibernation it does not want to start, the operations described above should be quite enough to resume normal operation. Otherwise, you will still have to visit the service center.

Some additional practical tips

A spark may sometimes be present on the spark plug, but it is not strong enough, since the ceramic of the insulator is “damp”. In this case, atmospheric moisture will be constantly absorbed. A certain part of the generated energy “flows” down the insulator, and what remains is too little for normal ignition. It is problems with the insulator that often become the main reason for the failure of spark plugs, which have worked a lot before. Before throwing them away, try to dry out the insides using a torch or gas stove, but it's best to replace them with a new one.