A motorcycle engine is a complex system that, unfortunately, is susceptible to negative environmental influences. If your motorcycle does not start, the reasons may be different, but by following simple steps, you can fix minor problems without the help of specialists.
If your battery is fully charged, you have carried out diagnostics and visually assessed the condition of all parts before starting the engine, most often the problem lies either in the wiring or in the spark plugs . In cases where the motorcycle does not start well when cold, try opening the air intake on the filter, but if the ignition does not allow you to start the engine, most likely the problem lies in condensation on the spark plugs. The fact is that due to temperature changes, condensation can form in the fuel system, which leads to rapid oxidation of the contact on the spark plugs. A visual inspection of the spark plugs will allow you to assess their condition.
According to statistics, 30% of motorcycles do not start without prior maintenance. At the same time, Soviet heavy motorcycles are more susceptible to frost and moisture, and problems most often arise with them when first started. Elements of the fuel system, in particular the carburetor, also remain sensitive. Metal parts oxidize due to low-quality gasoline, moisture remaining as a result of fuel combustion, and simply begin to jam. Blocked channels and improper operation of jets have characteristic signs - the engine runs unevenly, “coughs”, and stalls for no apparent reason even when the accelerator is pressed. Unfortunately, in some cases it is necessary to repair or clean the carburetor after inactivity. Car workshops most often do not undertake servicing of motorcycles, so you will have to look for a technician who understands your equipment.
The second most common problem is the lack of contact in the electrical circuit. The electrical system may suffer from oxidation at the wiring connections. It is worth checking all detachable connections at the terminals and contacts. Using special spray products that destroy the oxide film on the wiring may also help.
Leave it to mechanics or install electronics
Perhaps not all older motorcycle models are running. The Ural motorcycle sits and rusts in my grandfather’s barn because it won’t start.
The wheels are spinning, the engine is not jammed. Maybe the spark goes into the ground, as they say. In short, you need to look at the spark generation system. But even a working motorcycle, with a contact ignition system, causes unexpected and unpleasant problems for its owner:
- won't start when you really need it;
- with new oil rings in the engine, the spark plugs become covered with soot;
- there is no required engine power when driving with maximum load;
- the maximum speed is not reached;
- The battery is slightly discharged and the engine does not start.
Tuning a Ural motorcycle with your own hands - this article will help you decide in which direction to modernize your Ural.
The contact ignition system creates a lot of problems, especially when the moving parts in it have already worn out, backlash has appeared, and the geometry of the elements has changed.
The solution is simple - all cam ignition is thrown out, a modern electronic non-contact type spark generation system is installed. You will no longer have to deal with the thankless task of cleaning contacts and endlessly adjusting the gaps in the breaker. All this is possible thanks to the simple, but quite reliable design of the motorcycle. For example, it is quite easy to set the thermal gap and adjust the valves in the Urals with your own hands, using only your own tools from the garage. This way you will gain valuable experience and save money on visiting the workshop.
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GET IN - IT WILL NOT KILL! Some citizens believe that when repairing or diagnosing electrical wiring, you can get an electric shock. It's in vain. Modern motorcycles (as well as cars) have a voltage of 12 V. This voltage is absolutely safe for humans, for example, if you hold both poles of the battery even with wet hands, you will not feel anything. The only exception is the ignition system, where the voltage in the secondary circuit (armored wire - spark plug) reaches tens of thousands of volts. Here it is better not to grab with wet bare hands, although I have never heard of cases of a person receiving any injury from a high-voltage motorcycle wire. Conclusion: there is no need to be afraid of working with motorcycle electrics. Any household appliance operating on a 220 V network is much more dangerous.
If the engine does not start, it is not at all necessary to immediately “turn the switch” to the ignition system. Moreover, her refusals are extremely rare. Most often, the cause of failure to start is the wrong mixture: either too lean (when, for example, we start a motorcycle in the cold after a long break), or too rich (when on a hot engine the driver forgetfully pulled out the “choke” or after a fall, when gasoline leaks from the float chamber managed to “fill” the cylinder).
It also happens that during many attempts to start the motorcycle, the battery runs low and one malfunction is replaced by another: for example, the mixture may already be normal, but it is no longer possible to produce a spark when the battery voltage is low (and it can drop to 6 V during cranking with the starter) Maybe. In this case, before you disassemble anything, connect another battery to help or, if it is not there, try to start it with a kick.
Why the Ural motorcycle does not start - problems with compression
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 escapes 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.
Messages [11]
1↑ Topic from dimon_85 07/15/2012 14:42:39
- dimon_85
- passerby
- Inactive
- Registered: 01-07-2012
- Messages: 8
Thread: There is a spark, but it won't start.
Motorcycle - Ural. I started like this: I took off the left head, set the piston to TDC, then turned it back by 9 mm, a dot appeared on the flywheel. I turned on the ignition, took the control and one wire to ground, the other to the coil from which the wire goes to the ignition. I turn the ignition on and right before the cams break (before the control light comes on), I stop everything and fix it. A spark will kill an elephant, it won't start. Maybe I'm doing something wrong? Tell me please.
2↑ Reply from mexanik62 07/15/2012 14:49:07
- mexanik62
- Mechanic from the 30s.
- Inactive
- Name: Uncle Vitya
- From: Evpatoria
- Registered: 03-08-2011
- Messages: 10 831
- Reputation: 1 136
- Motorcycle: 12-volt K-750, ZAZ Sens Hatchback
Re: There is a spark, but it won't start.
Everything is correct, but in this case it is necessary to move the cams of the timing mechanism apart and in this position look for the ignition timing
+1
3↑ Reply from dimon_85 07/15/2012 14:52:55
- dimon_85
- passerby
- Inactive
- Registered: 01-07-2012
- Messages: 8
Re: There is a spark, but it won't start.
Everything is correct, but in this case it is necessary to move the cams of the timing mechanism apart and in this position look for the ignition timing
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
First start
After a long period of inactivity, the motorcycle needs proper maintenance before the first start. In order to understand why a motorcycle does not start after winter, you need to remember the sequence of preserving your bike after the end of the season.
The first thing that is usually done in preparing a vehicle for long-term storage without movement is to remove the battery . It must be stored in a cool place, in a charged state. Therefore, to start the new season, you will need to install the battery in place. Sometimes a motorcycle does not start after winter precisely because of the lack of charge in the battery. Before installing the battery in place, it may need to be recharged.
It is important to store the motorcycle with a full tank of gasoline, otherwise condensation may cause metal corrosion. Contrary to widespread misconception, gasoline in the tank does not deteriorate, and this cannot be the reason why a Ural or Honda motorcycle does not start.
In any case, before starting to drive, you must carefully check the presence of antifreeze, brake fluid, and change the oil. Brake fluid is very sensitive to environmental humidity. If there are leaky connections, it absorbs moisture, which leads to oxidation of the brake system, and in some cases, to brake failure. And remember, your haste or inattention can cause serious damage to your motorcycle, especially after a long period of inactivity.
What does the contactless ignition system on the Ural and Dnepr motorcycle provide?
- No headaches for the motorcycle owner when operating it;
- Starting the engine in wet and cold weather;
- Failure-free operation of the ignition system;
- Increased driving characteristics of the motorcycle as a whole;
- Increased candle life;
- Starting the engine when the battery voltage drops to 6 volts;
- Constant, not changing over time, ignition timing;
- The ignition coil cannot overheat.
- Powerful, required color, sparking.
Does not start. What to do?
It depends on what the symptoms are and whether they exist.
