The motorcycle won't start. Practical motorcycle tuning technique

URAL starter does not turn

If the control system of the above equipment does not turn on the starter when turning the ignition key to start, then the cause of the breakdown lies in the electrical equipment or electronic systems of the truck. The reasons may be the following:

Faulty relay and fuse box
Lack of contacts in electrical wiring connectors
Truck main relay malfunction
Failure of the ignition switch Failure of the starter
CAN bus break or short circuit
Lack of “mass”
No supply voltage at the engine control unit
Open or shorted wiring harness
Starter solenoid relay malfunction
Failure of the ignition switch
Failure of the engine control unit

Starter turns but won't start

If the starter of the described equipment spins when you turn the key in the ignition, but the engine does not show any signs. The cause of the malfunction may lie in both the electrical equipment of the car and the mechanics. Auto electrician malfunctions can be as described above, except for malfunctions associated with the starter and its circuits, plus the following reasons:

Malfunction of the high pressure fuel pump (HPF)
Mechanical engine failure
“Airing” of fuel equipment
Immobilizer malfunction
Lack of diesel fuel in the tank
Fuel filter clogged
Chip in the key is faulty
Clogged fuel lines
Check valve failure
Mechanical faults of injectors

Answers from experts

Ivan Rybalov:

The engine does not start for 2 reasons: 1. There is nothing to ignite 2. There is nothing to light them with and you have to dig.

Anna Nikolaeva:

Ignition timing is not set

Igor Chernyshev:

Did you mix up the caps on the spark plugs???

Alexander Parkin:

Are the spark plugs wet?? Drop a little gasoline from a syringe into the pots and try, are there any flashes?

Nikolay Ivanov:

Is there compression? Maybe the rings fell off. And then it stopped starting altogether.

Well, if after returning the old carburetor it’s the same story, I don’t know. Something coincided with something. Check the compression (the rings burst whenever they want), check the gaskets under the cylinders and heads. Check for air leaks in the intake manifold. Look to see if the candles are sewn under pressure. Look at the strength of the spark (sometimes there is one, but it is weak due to interturn breakdown in the coil)

Ilya Lytkin:

A complete answer will take more than one evening. Who knows how you did all this? ! And there may also be a spark if the coils are faulty, but its power will not be enough to start it. This is just one of the options

xxx:

1. Gap in breakers. 2. Replace the crankshaft cuffs.

Fro sT:

Look at the spark in the ignition cams, if it’s too hot, immediately change the capacitors, try it!!))

If everything is in order with this, then we look at the spark plugs.

Unscrew the spark plugs. Are they damp and smell like gasoline? This means they are flooded. This can be for two reasons - you filled them or there is a malfunction in the motorcycle.

If you did this, for example, you turned off or started the motorcycle incorrectly, then you can fix it as follows.

Dry the spark plugs, blow them out and heat them. !We do not clean with a wire brush!

Next, put the dry spark plugs in place and try to start the motorcycle. If the motorcycle works, then !hurray! we continue our way.

TIP: purchase and carry a spare set of candles with you; once filled candles can stop working at any time, even if you bought them just yesterday.

If after the above steps the motorcycle does not start, then there is a clear malfunction either in the presence of a spark or in the fuel supply. You will have to take the motorcycle to a specialist motorcycle service center.

The candles are fine, they are dry.

Checking the fuel supply.

Remove the fuel supply hose from the carburetor/injector.

Carefully! There must be gasoline in the hose, and it may be under pressure.

If there is no gasoline there, then the problem is most likely in the fuel pump or fuel tap.

And if you can try to solve the problem with the faucet yourself (rinse, blow out, clean), then it is better to entrust the problem with the gas pumps to specialists, so as not to make things worse.

All these actions led to nothing?

Gasoline supply

If the faucet flows fuel normally, check to see if sediment has accumulated in the carburetor float chamber. Open the drain hole, drain the contents, close it, and try to start the engine again.

To find out whether gasoline is entering the combustion chamber itself, you will need a spark plug wrench. Remove the armor wire from the spark plug, open the tap and operate the starter, then unscrew the spark plug and inspect the insulator. If it is dry, there is a problem with the fuel supply. A wet spark plug will need to be dried before screwing it back in.

Motorcycle malfunctions - the engine does not start

The engine may also not start if there is excess fuel in the cylinders, especially on a hot engine.

There is no sparking on the spark plug electrodes

After making sure that the ignition key is inserted all the way (the control lamp is on and the signal is working), unscrew the spark plugs, check the gap between the electrodes and, connecting their bodies to ground, press the trigger lever several times. If there is a fairly good spark between the electrodes of the spark plugs, then the cause of the malfunction should be sought in the engine power system.

If during this check there is no spark between the electrodes of the spark plugs or it is very weak, then it is necessary:

Make sure the battery is charged; The control lamp should be fully illuminated and not go out when the signal is turned on.
Check the reliability of the battery contacts.
Test the fuse for serviceability.
Remove the tip of the high voltage wire from the spark plug, bring it to the ground at a distance of 1.5-2 mm and, pressing the trigger lever, check for the presence of a spark between the ground and the tip. The presence of which indicates a faulty spark plug (insulation breakdown) that should be replaced. If there is no spark, make sure that the high voltage wires are in good condition.
Inspect the condition, clean and adjust the gap between the breaker contacts.
If necessary, replace the anvil and hammer.
Turn on the ignition and open the breaker contacts by hand. If a yellow weak spark jumps between them or there is no spark, then replace the capacitor.
If after performing all the previous operations there is still no spark, then the ignition coil should be replaced.

There is no fuel supply to the motorcycle carburetor

We press the drowner and fill the float chamber to make sure that fuel is present. If there is no fuel, check the serviceability of the carburetors themselves. If there is no filling, it is necessary to find the fault and eliminate it.

Check the presence of gasoline in the tank and its quality (the presence of water, large amounts of oil and mechanical impurities is unacceptable).
Inspect and, if necessary, clean the air hole in the fuel tank cap.
Disconnect the fuel lines from the carburetors and blow them out one at a time with compressed air.
Remove the sump and fuel tap filter, disassemble, wash in gasoline and after assembly blow with compressed air.

Carburetors are faulty or misadjusted

Remove, disassemble, wash the parts in gasoline and blow out the jets with compressed air.
Reinstall and check the fuel level in the float chambers. When installing, pay attention to the condition of the gaskets and the reliability of tightening the nuts securing the carburetor to the cylinders.
make quality adjustments as stated in the instructions.

Fuel quality

Normal operation of the internal combustion engine depends on the quality of gasoline. Moreover, when “hot” the engine is less susceptible to this factor, but “when cold” it may not start at all.

If your motorcycle does not start after a recent refueling, you may have been given poor quality fuel. If you refueled from a canister, condensation, rust particles or sand could get into the tank along with gasoline.

To correct the situation, drain low-quality gasoline from the fuel tank and carburetor. With injection engines it is more difficult - in order to drain fuel from the tank, you may have to remove the fuel module. This way, low-quality fuel will not pass through the pump and fine filter.

If you don't know how to get to the spark plugs or carburetor, don't torture yourself and your motorcycle in vain. Contact the professionals: call a field service specialist or call a motorcycle tow truck.

Izh Jupiter engine does not start

Today we will look at the popular question IZ Jupiter 5 won’t start, what should I do ? Before you start scolding a motorcycle, you should first put your hands on it. Try our instructions, perhaps the reasons found here will help you in repairing and tuning your motorcycle.

So, your motorcycle does not work and has stopped starting, let’s start looking for the reason.

Actually, first we should check whether gasoline flows from the tank to the faucet; to do this, we simply remove the faucet pan and see if gasoline flows there; if so, then the reason is not there.

Next, it’s worth checking whether gasoline is flowing into the carburetor; this can be easily done by removing the tube from the carburetor and opening the tap.

So, if gasoline flows into the carburetor, now it’s worth finding out whether gasoline flows from the carburetor to the CPG. To do this, you should try to start the motorcycle by dropping gasoline under the spark plug; if it starts without problems and stalls, then the reason is that there is no gasoline from the carburetor. We disassemble the carbrator, clean it and install new gaskets.

The cause could also be faulty wiring; here you will have to check the wiring yourself with a voltmeter and tester. In addition, it is worth checking the ignition, whether the light is on and whether it is set at all. Find materials on setting up the ignition on Izh Jupiter 5 on the website.

Other reasons: bad spark, replace the spark plug, bad ignition oil, too much oil, piston wear, crankshaft seal wear, lack of spark, faulty ignition, faulty coils

Source

The motorcycle did not start after a long period of inactivity

During the cold season, the motorcycle may not start due to condensation collected in the tank or inlet pipe, carburetor float chamber or air filter housing. It is also worth remembering that gasoline has a limited shelf life.

If the motorcycle has been parked all winter, change the gasoline, oil, spark plugs, fuel and air filters. Check the condition of the wiring.

Why Izh Jupiter 5 is not gaining momentum

I suspect there is a large amount of fuel in the cylinders.

He was possessed by a demon

If you are not satisfied with the answer or there is none, then try using the search on the site and find other answers in the Auto category

1. Cause of malfunction 2. Remedy

Kickstart lever skips or does not return (slowly returns) to its original position

1. Rotating the kickstarter lever on the shaft. 2. Tighten the lever mounting bolt; if the splines are severely damaged, replace the lever or shaft. 1. In cold weather, too viscous oil is poured into the gearbox. 2. Replace the oil corresponding to the ambient temperature (viscosity according to SAE 5W30, 10W30) or, as a temporary measure, you can slightly dilute the oil in the gearbox by pouring 100-150 cc into it. cm gasoline or kerosene. Remember to replace this mixture with “normal” oil as soon as possible. 1. Chips or severe wear of the sector teeth, ratchet or trigger gears. 2. Replace damaged parts, be sure to flush the gearbox. 1. The gear sticks on the clutch drum hub. 2. Eliminate jamming, dull the sharp edges of the gear hole. 1. The trigger spring has burst or weakened. 2. Replace the spring. 1. The retaining ring has come off the clutch drum hub. 2. Replace the ring or drum.

Engine won't start

1. The ignition is turned off by the emergency switch. There is no spark at the spark plug. 2. Turn on the ignition. 1. There is no fuel in the tank. 2. Fill the tank. 1. On a cold engine, the starting device (fuel corrector) is not turned on. 2. Turn the fuel corrector lever and, if necessary, eliminate the drive malfunction (sticking cable or corrector plunger). After starting and warming up the engine, return the corrector lever to its original position. 1. Fuel does not enter the carburetor due to clogged filters or valve channels (there is no stream of fuel from the hose removed from the carburetor and the fuel valve is open). 2. Remove the valve, disassemble and wash all parts in solvent, blow out the channels and the fuel hose with compressed air. After installing the valve and connecting the hose to the carburetor, press the float reducer to fill the carburetor float chamber with fuel. 1. There is no spark on the spark plug due to it being oiled with the fuel mixture, poor contact between the tip of the spark plug and the high-voltage wire, or another malfunction of the spark plug. Fuel condensate has accumulated in the crank chamber of the engine, which leads to over-enrichment of the combustible mixture and the impossibility of its ignition. 2. Turning off the fuel supply and opening the decompressor valve, blow out the crank chamber and cylinder with several slow movements of the kick starter lever. If this does not help, remove, clean or replace the spark plug. Ensure reliable contact in the connection of the high-voltage wire with the tip of the spark plug. 1. Other elements of the ignition system are faulty or the connections between them are in poor contact (no spark on the spark plug). 2. Check one by one the high-voltage wire, ignition coil, capacitor, operation of the breaker contacts, ignition timing, fuse and battery charge, ignition switch. Replace faulty elements, ensure reliable electrical contact between them. If necessary, adjust the ignition timing, check the level and density of the electrolyte, clean the surface, terminals and terminals of the battery, charge or replace the battery. 1. The throttle valve (its drive) or the carburetor needle valve is stuck, the fuel jets and carburetor channels are clogged, in particular the starting device channels. 2. Wash the carburetor parts in a solvent and blow out the channels with compressed air, repair and adjust the carburetor, as well as the throttle valve drive.

Checking cylinder compression.

If the Minsk motorcycle still does not start, then you need to check the compression. To do this, you need to unscrew the spark plug and pour a few grams of gasoline directly into the cylinder through the vacated hole.

Next, tighten the spark plug and try to start the motorcycle. After this, the engine should start and after running at full speed for a few seconds, stall.

If the motorcycle starts, then you should move on to more careful adjustment of the carburetor. Namely, using the appropriate bolts, try to adjust the opening of the idle air damper and adjust the proportions of the mixture entering the combustion chamber.

If the Minsk motorcycle does not start, there is a spark - this means that the mixture entering the combustion chamber does not reach the required compression and does not ignite.

There are many reasons why there may be no compression in the cylinder of a Minsk motorcycle:

If the engine is equipped with valves, you may need to check for cracks on them. Also, the valves may not fit tightly to the “seat” or it may have quite a lot of wear.
Burnout of the cylinder head gasket due to wear;
Cylinder seizure due to engine overheating;
Severe wear on the cylinder or piston;
The cylinder rings have collapsed or are not installed correctly;
Cracks have formed on the piston or cylinder due to long use;
For engines equipped with valves, the gas distribution valve circuit may be broken, or this mechanism may not be installed correctly.

Therefore, for subsequent diagnosis of a malfunction of the Minsk motorcycle, it is necessary to completely disassemble the cylinder. It should be done slowly and ensure the cleanliness of all components.

Armed with patience, you need to examine all available spare parts for faults, defects, or simply incorrect installation.

Having made a lot of effort to carry out the described manipulations, it is safe to say that all attempts were made to eliminate the cause of the motorcycle malfunction: the functionality of the fuel system and ignition system was checked, and the presence of compression was checked.

But if the Minsk motorcycle still fails to start, then perhaps you should contact a motorcycle service center with specialized specialists for accurate diagnostics and subsequent repair of the motorcycle.

Carburetor problems

So, you are the owner of a Minsk motorcycle, the carburetor of which regularly receives gasoline, and the spark plug provides a spark sufficient for stable operation of the engine.

But this is not enough for the motorcycle to start. An unscrewed dry spark plug showed that the problem was in the carburetor, namely, the incoming fuel could not reach the combustion chamber of the cylinder. In this case, it is necessary to remove and clean the carburetor.

To clean the carburetor, it must be removed by disconnecting it from the cylinder and air filter. You also need to disconnect the throttle cable and gasoline hose. To prevent dirt from getting inside the carburetor, before further disassembly you must not be lazy and completely clean it.

It is necessary to disassemble and reassemble the carburetor cleanly, since dust or dirt particles getting inside will lead to unsatisfactory operation of the motorcycle engine even after washing it.

Upon completion of disassembling the carburetor, it is necessary to clean all its parts from accumulated dirt, and also blow out all channels and the jet with a compressor. It will not be superfluous if you additionally blow out the air filter and gas tap.

After completing all the manipulations, you need to install the carburetor in place. During assembly, as well as during disassembly, it is necessary that no dirt gets inside the carburetor.

After installation, make sure that the carburetor fits tightly to the cylinder. If you did everything correctly, you can be sure that after some effort your Minsk motorcycle will be able to start.

Spark test

To check the Minsk motorcycle, you need to remove the spark plug and unscrew the spark plug. Next, you should immediately determine (wet or dry) the spark plug contact.

If the contact is wet, then most likely there is a problem with the spark plug in your motorcycle. If the contact is dry, then you should look for a problem in the carburetor.

Since the spark plug has already been unscrewed, you can diagnose and verify its functionality. Before checking for a spark, the correct gap between the spark plug electrodes should be set.

According to the technical recommendation of the Minsk motorcycle manufacturer, the required gap should be from 0.4 to 0.7 mm, depending on the model. The gap is set using a feeler gauge, which can be purchased at any auto or motorcycle parts store. If you work on the Minsk motorcycle yourself, then this tool should already be in your kit.

To check the spark on a removed spark plug:

insert the candle into the candle holder;
short-circuit the spark plug body to ground;
activate the winding stem.

Attention! When checking the spark plug, you must hold it only by the installed candle holder, otherwise electric shock may occur.

It should also be noted that spark is different. The correct working spark should always be the same, clearly visible, and always pass in the same place.

If a spark does not jump between the contacts of the spark plug, then it is necessary to check again, but using a different spark plug. If after re-checking a spark appears, this indicates that the installed spark plug was faulty and should be replaced. If there is still no spark, then you need to check the ignition system of the Minsk motorcycle.

We measure compression

Compression is the pressure in the cylinder at the end of the compression stroke. The magnitude of this pressure allows you to assess the condition of the engine. A working Alpha moped engine should have a compression of at least 8-10 kg/cm² (“atmospheres”) . If it is less, then the engine is faulty: either the piston rings are worn out or the valves are leaking. Most likely the engine will need to be disassembled.

Compression is measured using a compression meter - a special pressure gauge that is inserted or screwed in (depending on the design) instead of the spark plug.

Before measuring compression, it is advisable to warm up the engine, but if it does not start, you will have to measure it cold. It is also advisable to unscrew the carburetor or open the throttle valve and turn off the fuel supply.

The engine must be rotated using an electric starter or kickstarter until the compression meter readings stop increasing.

When the compression is less than 8 atmospheres , you need to pour 10-15 ml of engine oil into the spark plug hole using a syringe. If after this the compression increases noticeably, it means the piston rings are worn out . If not, then the problem is in the valves or camshaft drive . The most common reason: the camshaft drive chain is broken or has slipped, or the valves are bent/broken.

IZh will not start.

We ask all questions and look for answers here

IZh will not start.

26 Sep 2013, 17:01
Good day everyone! Please tell me why the fuel does not flow into the cylinder? I’ve already replaced 3 carburetors, all are in good working order, I unscrew the spark plug and it’s dry! what could happen to him!

PS A HUGE thank you to Red Shukhov for his help in transporting the bike

Formalin19 Experienced Messages: 37 Images: 4 Registered: Jan 09, 2011, 11:12 pm From: Nevinnomyssk Name: Dmitry City of residence: Nevinnomyssk Motorcycle brand: Sabur 110cc

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Re: IZH won't start.

26 Sep 2013, 17:35
is there compression? And if you drop a couple of grams of gasoline under a candle, does it sneeze?

I washed my socks for tomorrow, I guess I'll be alive! (c) Yu. Shevchuk

Dmitryleon “Teacher” Messages: 7586 Images: 164 Registered: Feb 27, 2006, 10:22 pm Name: Dmitry City of residence: Georgievsk Motorcycle brand: IZH 7-108 => Honda CB400SF => VAZ 11113

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Re: IZH won't start.

26 Sep 2013, 17:43
Most likely, either the seal of the crankshaft is broken, or there is no compression, remove the carb, put your hands on the intake manifold and poke, you won’t feel pulsation on your hand - dead

Repair of scooters (KMV) 8928358459dva Soldering of plastic 8928358459dva

Matey “Yavist all over” Messages: 2286 Registered: May 03, 2009, 2:34 pm From: Essentuki Name: Matvey City of residence: Essentuki Motorcycle brand: TTR 250/2 2013 & TAZ 2106

Re: IZH won't start.

26 Sep 2013, 17:56

Matey wrote: Most likely, the seal of the crankshaft is broken

+1 This is where we need to start.

Formalin19 Change the crankshaft seals.

Mechanic JAWA-application Messages: 1726 Registered: December 11, 2006, 17:41 From: Stavropol Name: Artyom City of residence: Stavropol Motorcycle brand: 4 pcs.

Re: IZH won't start.

26 Sep 2013, 21:09
Chet looked at the drawings of the motor and did not find such a thing as a valve.

I wonder how the backflow into the carburetor is prevented?

hm Long-lived Messages: 1131 Registered: June 26, 2013, 01:57 Name: Name City of residence: City

26 Sep 2013, 22:14

hm wrote:
Chet looked at the drawings of the motor and didn’t find such a thing as a valve.
I wonder how the backflow into the carburetor is prevented?

There are also holey cylinders.

The main thing is don’t think, imagine that it will work without them and it will start! The main thing is to BELIEVE!

vk.com/moto_krasnodar The entire motorbike crowd of Krasnodar and the region

admin Long -lived Messages: 1303 Images: 4 Registered: June 5, 2009, 10:53 pm From: Prokhladny-> Kislovodsk-> Krasnodar Name: Vitaly City of residence: Krasnodar Motorcycle brand: VTR-250

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26 Sep 2013, 22:28

Well, it’s understandable that the cylinders are full of holes.

The mixture is pressurized through a hole into the chamber, replacing the waste mixture.

What I mean is that you first need to take the mixture from the carburetor and then spit it into the chamber.

hm Long-lived Messages: 1131 Registered: June 26, 2013, 01:57 Name: Name City of residence: City

Re: IZH won't start.

Sep 26, 2013, 10:41
p.m. We've been fed up, so we're leaving. There is no valve in a two stroke. just imagine. At WHAT speed should it open and close and what strength should the spring have in order to have time to return it back 10,000 per minute, while nothing compresses this spring to open it! I’m telling you – a miracle! There is no such valve in the Izhak, the designers did it at the factory, but if you believe that it will work, then it will work. Seriously, the most important thing here, as mentioned above, is the TIGHTNESS of the crankshaft chamber. check the seals, oil seals, gaskets. forget about the valve - it’s a MIRACLE!

vk.com/moto_krasnodar The entire motorbike crowd of Krasnodar and the region

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26 Sep 2013, 22:49

odmin wrote: to close and how strong the spring must be in order to have time to return it back 10,000 per minute, while nothing compresses this spring to open!

Why can’t the valve just be nailed back with a compressible mixture and opened with atmospheric pressure?

Despite the fact that he does not experience monstrous loads.

hm Long-lived Messages: 1131 Registered: June 26, 2013, 01:57 Name: Name City of residence: City

Re: IZH won't start.

26 Sep 2013, 22:51
IZH, at least some? If it doesn’t suck through the carb, but rather in the return direction, then it is quite possible that a piece of the piston is missing. It happens.

CACTUS Long-liver Messages: 2876 Images: 0 Registered: February 14, 2008, 6:18 pm From: PYATIGORSK Name: Alexander City of residence: Pyatigorsk Motorcycle brand: DR 800 big XR 250

Re: IZH won't start.

Sep 26, 2013, 10:54 pm
I had IZH - JUPYTER 4, I assembled it from 3 different ones. THERE IS NO VALVE THERE! there is the magic of energy and aerodynamics. If you find it difficult to believe, imagine that the crankshaft, with its counterweight, closes the hole to the carburetor.

vk.com/moto_krasnodar The entire motorbike crowd of Krasnodar and the region

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Re: IZH won't start.

26 Sep 2013, 22:55
Ahh

those. Does the piston wall act as a valve?

hm Long-lived Messages: 1131 Registered: June 26, 2013, 01:57 Name: Name City of residence: City

Re: IZH won't start.

26 Sep 2013, 22:55

hm wrote: Why can’t the valve just be nailed back with a compressible mixture and opened with atmospheric pressure?

Maybe this is exactly how it was made, only the valve is a reed valve, without a coil spring.

But in Izhas they didn’t get to this point; there the piston simply blocks the holes.

Re: IZH won't start.

26 Sep 2013, 23:34
Post identifying true bikers who have no idea about how a 2T engine works? This is buzz! But for 300 thousand a moped.

any connection where the screw can be replaced with wire, I prefer wire, it is more reliable...

fly agaric Long-lived Messages: 3891 Images: 190 Registered: July 28, 2007, 09:34 Name: Andrey City of residence: 10831 km from Magadan Motorcycle brand: burped raptor

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Re: IZH won't start.

26 Sep 2013, 23:37
360

although taking into account the already bushiness of 300, it’s still not enough

never dropped

hm Long-lived Messages: 1131 Registered: June 26, 2013, 01:57 Name: Name City of residence: City

Re: IZH won't start.

27 Sep 2013, 07:20
A true biker is the one who has 300 thousand for a moped and not the one who knows everything about motors but walks. )

vk.com/moto_krasnodar The entire motorbike crowd of Krasnodar and the region

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27 Sep 2013, 07:24

hm wrote:
Well, it’s understandable that the cylinders are full of holes.
The mixture is pressurized through a hole into the chamber, replacing the waste mixture.
What I mean is that you first need to take the mixture from the carburetor and then spit it into the chamber.

If only I had shown this picture to the Izhevsk designers in the 70s, you see, the motorbike would not have died down... Although they say that the engineers there were smart, it’s just that the management rejected all development.

Maxim Motorcyclist of the city of Stavropol Messages: 1584 Images: 0 Registered: February 22, 2006, 21:29 Name: Maxim City of residence: Stavropol Motorcycle brand: Dnipro

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Re: IZH won't start.

27 Sep 2013, 08:12
Formalin19 Check the sump of the gas tap. It could be clogged with rust, pour magarych into it (5-10 cubes of pure gasoline from a syringe into the spark plug holes, if there is a spark, you should catch it.)

Voskhod 3M-01=>IZH Planet 5=>Honda CBX250 RS-e+Jawa 638 01-03=>Yamaha XJR 1200…

ARXANGEL Yavist Messages: 982 Registered: December 17, 2010, 21:17 From: Essentuki village Name: Dmitry City of residence: St. Essentuki Motorcycle brand: Yamaha XJR 1200

27 Sep 2013, 09:12

CACTUS wrote: IZH, at least some kind? If it doesn’t suck through the carb, but rather in the return direction, then it is quite possible that a piece of the piston is missing. It happens.

Izh Planet 3, there seems to be compression, it gives 7.2 when cold, I poured gasoline through the spark plug hole - it doesn’t catch, maybe I poked the paw poorly?

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Re: IZH won't start.

27 Sep 2013, 09:14
when they installed the new carb, it started up, we even had time to drive it, turned it off, and that’s it - no signs of life...

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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).

Why does the Izh Jupiter engine not start after replacing the piston?

So, your motorcycle does not work and has stopped starting, let’s start looking for the reason.

Actually, first we should check whether gasoline flows from the tank to the faucet; to do this, we simply remove the faucet pan and see if gasoline flows there; if so, then the reason is not there.

Next, it’s worth checking whether gasoline is flowing into the carburetor; this can be easily done by removing the tube from the carburetor and opening the tap.

Other reasons: bad spark, replace the spark plug, bad ignition oil, too much oil, piston wear, crankshaft seal wear, lack of spark, faulty ignition, faulty coils

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